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Articles 1 - 30 of 102
Full-Text Articles in Plant Biology
Seombadi (Dystaenia Takesimana [Nakai] Kitagawa), A New Forage Plant: Its Germination And Early Growth Characteristics, D A. Kim, S H. Hur, Y J. Kim, C M. Park
Seombadi (Dystaenia Takesimana [Nakai] Kitagawa), A New Forage Plant: Its Germination And Early Growth Characteristics, D A. Kim, S H. Hur, Y J. Kim, C M. Park
IGC Proceedings (1977-2023)
Seombadi (Dystaenia takesimana [Nakai} Kitagawa) is a member of the Apiaceae (Umbelliferae) family and is ecologically adapted to the island of Ulneung, situated 160 km off the east coast of the Korean peninsula. The plant is an important forage for livestock on the island; but because of lack of knowledge about its germination, and its slow establishment characteristics, its use on mainland Korea has been limited. Objectives of our study were to examine the seed characteristics and factors affecting germination of seombadi and to evaluate depletion of seed food reserves and elongation of organs of seedlings during germination and …
Phytotoxic Response Of Five Range-Grass Species To Six In-Situ Fossil-Fuel Retort Waters, O D. Skinner, J C. Sexton, T S. Moore, D S. Farrier
Phytotoxic Response Of Five Range-Grass Species To Six In-Situ Fossil-Fuel Retort Waters, O D. Skinner, J C. Sexton, T S. Moore, D S. Farrier
IGC Proceedings (1977-2023)
Oil shale, tar sands, and undergrowid coal gasification represent viable sources of fossil fuel to assist in meeting U.S. energy needs. Development of fossil-fuel-processing technologies has progressed to a point where commercialization may soon become a reality. Concurrent with this development must be the assessment and solution of environmental problems. A particular and significant problem resides in the handling, containment, treatment, disposal, use, and eventual fate of waters recovered with the oil, gas, and subsurface waters associated with synfuel-processing techniques. The magnitude of plant responses and potential phytotoxic effects resulting from exposure to these produced waters have not been evaluated, …
Method For Obtaining Better Germination Of Green Panic (Panicum Maximum Var. Trichoglume Eyles) Seed, T Okada
Method For Obtaining Better Germination Of Green Panic (Panicum Maximum Var. Trichoglume Eyles) Seed, T Okada
IGC Proceedings (1977-2023)
Because germination of green panic seed was unstable, a series of tests were performed to establish methods for obtaining better germination of this seed earlier than usual after it is harvested. In this report key points of the methods formulated are described. Seed ripened at 21 °C showed a higher germination percentage in its early age ( 4 months after harvest) than that ripened at 25°C or 29°C. Excellent early age germinations were realized by drying seed slowly immediately after harvest, especially by spending as much as a month gradually drying seed at 20°C and stirring every few days. Heating …
Physiological Characteristics Of Green Needlegrass (Stipa Viridula Trin.), Edward F. Redentre, Timothy E. Fulbright
Physiological Characteristics Of Green Needlegrass (Stipa Viridula Trin.), Edward F. Redentre, Timothy E. Fulbright
IGC Proceedings (1977-2023)
Green needlegrass is commonly used in range seedings in the northern Great Plains in the United States (U.S.). Because of its potential as a revegetation species a series of experiments were conducted to determine 1) germination requirements; 2) capacity of seedlings for emergence and root growth following dehydration; and 3) influence of planting depth, seed source and temperature on seedling emergence and morphology. A variety of sources of green needle grass seed were used in growth chamber experiments following standard procedures. The results indicated that optimum temperatures for green needlegrass germination were 20°C (constant) and 20-15°C (16 hour-8 hour alteration) …
Italian Ryegrass Response To Allelopathic Effects Of Stubble-Residues From Several Tropical Grasses, Y Takahashi, S Uozumi, S Ono, Y Yoden
Italian Ryegrass Response To Allelopathic Effects Of Stubble-Residues From Several Tropical Grasses, Y Takahashi, S Uozumi, S Ono, Y Yoden
IGC Proceedings (1977-2023)
The laboratory experiments with aqueous extracts of 11 tropical grass stubble-residues allowed an examination of the allelopathic effects of the extracts on seed germination and early growth of Italian ryegrass (Lolium multiflorum, cv. Minamiwase, Abbr. as IRG). Germination of IRG was generally found to be reduced with an increase in concentration of the residue extracts. Extracts of African millet (Eleusine coracana), Guinea grass (Panicum maximum, strain GR-171) and setaria (Setaria anceps, cv. Nandi and Kazungula) were very inhibitory to the germination of IRG at a high concentration (4g dried stubble/lOOml) ; whereas …
Allelopathic Effects Of Tall Fescue On Germination And Seedling Growth Of White Clover Genotypes, G A. Rederson
Allelopathic Effects Of Tall Fescue On Germination And Seedling Growth Of White Clover Genotypes, G A. Rederson
IGC Proceedings (1977-2023)
Tall fescue (Festuca arundinacea Schreb.) and white clover (Trifolium repens L.) are commonly grown together in pastures of the southeastern USA. Allelopathy of tall fescue may reduce white clover germination and growth during establishment of the legume. The objective of this study was to determine if white clover genotypes differ in germination and initial growth in extracts of tall fescue leaves. Agar containing leaf extracts from tall fescue was used to test the germination and root growth of forty white clover genotypes. Significant differences were found between the genotypes for percent germination and root length score. Root length score …
Towards Developing A Model Of Persistence And Production For White Clover, M J. Hill, K A. Archer, K J. Hutchinson
Towards Developing A Model Of Persistence And Production For White Clover, M J. Hill, K A. Archer, K J. Hutchinson
IGC Proceedings (1977-2023)
The development of a model which successfully simulates the response of white clover Trifolium repens L. to environmental variables affecting persistance would be of great value for defining critical limiting processes. In Australia, persistence is determined by the impact of climate, competition and grazing on the processes of generation, from seed or by stolons (Jones, 1980; Archer and Robinson, 1988). Here we outline a model of white clover persistence and production in eastern Australia. In Australia the four critical phases in the lifecycle of white clover where the environment can threaten persistence are : late autumn and winter when germination …
Evaluation And Selection Of The Salt-Tolerant Alfalfa, Geng Huazhu
Evaluation And Selection Of The Salt-Tolerant Alfalfa, Geng Huazhu
IGC Proceedings (1977-2023)
Alfalfa (Medicago sativa) as a good forage has b��en popularly cultivated for a long time in China. Now it is mainly distributed in the north of the Yangtse River, and covers about 1.3 million hectares in the 14 provinces and regions. It can be planted in the saline-alkali areas, accept alluvial plains and hill regions, for instance, the North of Jiangsu, East of Hebei, North-west of Shandong and Xingjiang. The alfalfa is successfully used in improving and utilizing the saline-alkali soils for developing animal husbandry in the Gangzhou District of Hebei Province, where its planting area is increasing rapidly, …
The Potential Of Lolium Multiflorum X Festuca Gigantea Hybrids, M O. Humphreys, H Thomas, B F. Tyler
The Potential Of Lolium Multiflorum X Festuca Gigantea Hybrids, M O. Humphreys, H Thomas, B F. Tyler
IGC Proceedings (1977-2023)
The potential for combining traits from broadly adapted Festuca with more highly specialised Lolium has been investigated for many years especially with regard to cytological behaviour (Breese et al., 1981). In the USA, efforts to increase the nutritive value of tall fescue through hybrids with ryegrasses succeeded in producing the variety Kenhy (Buckner et al., 1977). So far, Lolium/Fescue hybrids have not been able to compete commercially with more productive ryegrasses in intensive UK farming systems (Breese and Lewis, 1984). However, with recent economic changes in European agriculture there is a need for more efficient, lower input grassland …
Influence Of The Manner Of Sowing And Vegetation Cycle On The Yield And Seed Quality Of Birdfoot Trefoil (Lotus Corniculatus), D Gataric, S Alibegovic-Grbic
Influence Of The Manner Of Sowing And Vegetation Cycle On The Yield And Seed Quality Of Birdfoot Trefoil (Lotus Corniculatus), D Gataric, S Alibegovic-Grbic
IGC Proceedings (1977-2023)
In ecological conditions of Yugoslavia, birdsfoot trefoil, with its positive features, presents a very significant fodder crop, especially for the hill and mountain regions. However, due to poor seed production technology, there is a shortage of seed for more intensive production. Seed is usually produced on areas intended for the production of fodder, hand sown with large quantities of seed (25-35 kg/ha). The study was undertaken. with the following targets : I/determining the influence of the manner of sowing and vegetation cycle on the yield and the quality of seed ; 2/ determining the optimum sowing manner and vegetation cycle …
Viability Of Stylosanthes Seeds As Affected By Storage Duration, J B. Brolmann, B J. Boman
Viability Of Stylosanthes Seeds As Affected By Storage Duration, J B. Brolmann, B J. Boman
IGC Proceedings (1977-2023)
Tropical legumes such as members of the genus Stylosanthes (sty lo) contribute to the improvement of pastures in the tropics and sub-tropics. Stylosanthes is usually established from seed. In Florida, seed of Stylosanthes has to be produced and collected before the onset of the winter since occasional frosts can damage seed-bearing vegetation. Therefore, early maturing Stylosanthes varieties have been developed. In stylo seed collections maintained for breeding or seed exchange purposes, maintenances of seed viability is critical. New pests or new diseases may require a renewed screening of stored accessions. It is important, then, that the seed source of this …
Effect Of Tillage On Regeneration Of Annual Pasture Legumes In Cereal-Livestock Farming Systems, E D. Carter, P G. Fulwood
Effect Of Tillage On Regeneration Of Annual Pasture Legumes In Cereal-Livestock Farming Systems, E D. Carter, P G. Fulwood
IGC Proceedings (1977-2023)
The self-regenerating annual pasture legumes, mainly Medicago spp. (medics) and Trifolium spp, (clovers), are important components of annual pastures on millions of ha in the mediterranean climatic zones of the world. We have shown that tillage practices for cereals and other crops have a severe effect by reducing legume density and productivity after a cropping sequence. Deep-burial of pasture legume seed by disc ploughing and mouldboard ploughing is most detrimental, as a high percentage of seed is buried too deeply to allow emergence, while normal scarifying at 6-8 cm causes little loss of potential legume seed germination and seedling emergence. …
Increasing The Germination Of Seed Of Fine-Stem Stylo (Stylosanthes Guianesis Var. Intermedia) Using A Heated, Rotating Cylinder, Colin J. Paton
Increasing The Germination Of Seed Of Fine-Stem Stylo (Stylosanthes Guianesis Var. Intermedia) Using A Heated, Rotating Cylinder, Colin J. Paton
IGC Proceedings (1977-2023)
Scarifying pasture legume seed to reduce hard seed content can improve pasture establishment. A heated, rotating cylinder suitable for treating large quantities of seed was used to test the effect of a range of heat doses (measured in cumulative degree-seconds of treatment above 90°C and expressed as degsecs>90°C) on seed of fine-stem stylo (Stylosanthes gulianensis var. lmermedla), Heat doses ranged from O to 1500 degsecs>90°C, A heat dose of 450 degsecs>90°C, achieved by heating seed at 120°C for 15 seconds in the cylinder, gave the highest germination without increasing the proportion of dead seed. This treatment …
Towards An Ideal Seed Coating, J M. Scott
Towards An Ideal Seed Coating, J M. Scott
IGC Proceedings (1977-2023)
Coated pasture seeds have been formulated in the past based largely on "trial and error" with relatively few objective criteria being employed to define desirable formulations, A description of desirable propelties of various layers of seed coatings and of the seeds themselves is presented.
An Investigation In To The Effect Of Some Factors On The Germination Of Erodium Seeds, Myrna Johnston, Alfredo Olivares, Gladys Fernandez
An Investigation In To The Effect Of Some Factors On The Germination Of Erodium Seeds, Myrna Johnston, Alfredo Olivares, Gladys Fernandez
IGC Proceedings (1977-2023)
Erodiurn seeds present variable dormancy in and even within each species. Thus, it is important to know the factors that determine this variation as related to the persistence of its species. E. rnoschatmn and E. rnalacoides seeds were collected at the end of the annual cycle at La Rinconada de Maipli (33°28'S and 7S050'W). Effects of seed sour.ce (collecting in 1986, 1988 and 1990), age (keeping seeds under laboratory conditions) and maternal factors (cutting plants at early flowering) were analysed. Seeds were tested for germination capacity and germination rate at a constant temperature of 15°C on Petri dishes provided with …
Long-Term Seed Dormancy In Poa Pratensis L. Northern Norway, Trygve S. Aamlid, Dagfinn Arntzen
Long-Term Seed Dormancy In Poa Pratensis L. Northern Norway, Trygve S. Aamlid, Dagfinn Arntzen
IGC Proceedings (1977-2023)
Inadequate gennination has often been obseived when planting Poa pratensis L. cv. Lavang (69°N) in northern Norwegian grasslands. This investigation was intended to elucidate whether this was due lo longterm seed dormancy, Seed-lots grown in different years in northern and southern Norway and stored at O-to•c, were germinated in Jakobsentype germinators al various combinations of temperature and light. Significant dormancy was expressed at 21 °C even after 10 years of storage. Al this constant temperature, germination was promoted by 8 h fluorescent light compared with darkness and continuous light. Al 21/ I 2°C alternating temperature, seed genninated well irrespective of …
The Benefits Of Seed Quality In Intensive Temperate Forage Systems, Jeffrey J. Steiner
The Benefits Of Seed Quality In Intensive Temperate Forage Systems, Jeffrey J. Steiner
IGC Proceedings (1977-2023)
Seed quality has traditionally been considered to consist of two components: physiologic and genetic quality. The benefits of using high quality seeds have been widely documented and are generally not questioned. These henefits came about as a result of a firstgeneration of seed quality aware11ess which began more than a century ago. In intensive temperate forage production systems, the producer usually has a ready supply of high-quality seeds available for purchase. For the consumer, seed quality is not a major constraint to system productivity, However, many forage producers are not realising all of the potential benefits from using high quality …
Effects Of Seedbed Environment Of Germination And Seedling Establishment Of Spiny Hopsage (Grayia Spinosa [Hook.] Moq.), Nancy L. Shaw, Marshall R. Haferkamp
Effects Of Seedbed Environment Of Germination And Seedling Establishment Of Spiny Hopsage (Grayia Spinosa [Hook.] Moq.), Nancy L. Shaw, Marshall R. Haferkamp
IGC Proceedings (1977-2023)
This study exam!ned the influence of seedbed micro-environment on germination and seedling establishment of spiny hopsage (Grayia spinosa (Hook.J Moq.) in the shrub steppe of western North America. Two seed collections were drilled in late autumn, early spring and late spring 1987-88. With low precipitation, seedlings established only from late-autumn plantings (
Effect Of Final Cutting For Fodder On Seed Yield And Seed Quality In Berseem, S L. Saini, R K. Chowdhury
Effect Of Final Cutting For Fodder On Seed Yield And Seed Quality In Berseem, S L. Saini, R K. Chowdhury
IGC Proceedings (1977-2023)
The study was conducted to determine the appropriate time of final culling (closing) for fodder to optimise the seed yield and seed quality in berseem (Trifolium alexandrinum L.). Based on 2 years' experimentation, the maximum seed yield was obtained when the final cut for fodder was taken in mid•March and the crop was then closed for seed. Seed yield was reduced drastically when the final cut was delayed to late March•April. The seed quality parameters of standard germination, seed weight and vigour index were also reduced when the final cut for fodder was delayed to late March•early April. Based …
Studies In Germination And Thousand-Seed Weight In Chicory Cv. Grasslands Puna, W J. Archie, J S. Rowarth, B R. Guy
Studies In Germination And Thousand-Seed Weight In Chicory Cv. Grasslands Puna, W J. Archie, J S. Rowarth, B R. Guy
IGC Proceedings (1977-2023)
A strong, positive correlation was found between 1000-seed weight (TSW) and germination in chicory (Cichorium intybus L.) cv. Grasslands Puna. Low TSW tended to be associated with empty or immature seed; empty seed was associated with exclusion of bees. No significant differences in seed characteristics were found between seeds harvested from different positions (top, middle or bottom third) on the plant. Optimum harvest lime was 4 weeks after peak flowering.
Seed Production Of Plantain (Plantago Lanceolata L.), J S. Rowarth, M P. Rolston, W J. Archie
Seed Production Of Plantain (Plantago Lanceolata L.), J S. Rowarth, M P. Rolston, W J. Archie
IGC Proceedings (1977-2023)
Seed development studies showed that seed maturity in plantain (Plantago lanceolata L,) occurred 6 weeks after anthesis; maximum seed yields were obtained 8 weeks after anthesis. This is consistent with the fact that seed heads take approximately 17 days to complete flowering. Fertiliser nitrogen increased plantain seed yield. Time of closing, timing of nitrogen application and different stand densities did not significantly affect seed yield, probably because plantain can adapt to and compensate for the treatments imposed.
Recommended Methods For Improving Pasture Seed Quality In Yunnan Province, South-West China,, Li Shuan, Zaho Jun-Quan, Dai Chong-Li
Recommended Methods For Improving Pasture Seed Quality In Yunnan Province, South-West China,, Li Shuan, Zaho Jun-Quan, Dai Chong-Li
IGC Proceedings (1977-2023)
Pasture seed is needed for the development of improved pasture in the province of Yunnan, south-west China, but the annual production in the province is only 15-30 t, the shortfall being made up by imported seed. Problems are often encountered with seed quality. The tests outlined in this paper were undertaken to overcome some of these. Results showed that the problem of seed quality was quite serious in the province and to rectify this the following procedures are recommended: ( 1) formulation of precise rules for testing and standards for purity and germination of all pasture seed lines in the …
Improving Germination And Seedling Establishment Of Chicory, S N. Hur, W F. Hunt
Improving Germination And Seedling Establishment Of Chicory, S N. Hur, W F. Hunt
IGC Proceedings (1977-2023)
Chicory (Cichorium intybus L.) seeds were treated before sowing with polyethylene glycol (PEG 6000) under different PEG concentrations, treatment period and temperatures, and tested for uniformity of germination, establishment and drought tolerance. Suitable seed coating materials were found that improved emergence, establishment and seedling growth when surface sown on established swards. The best primed or coated seeds in germination tests were surface sown in growth cabinet and field.Osmotic priming with PEG accelerated germination of chicory and significantly reduced time taken for germination compared with coated seeds in Petri-dishes, but not in the field. In contrast, coated seeds germinated more slowly …
Selection For Improved Low Temperature Germination Of White Clover Seed, J R. Caradus
Selection For Improved Low Temperature Germination Of White Clover Seed, J R. Caradus
IGC Proceedings (1977-2023)
Selections were made within 10 cultivars of white clover (Trifolium repens L.) for rapid germination rale al 4°C. There were 2 selection cycles and progeny from crosses between genotypes selected from within cultivars were compared wilh the original unselected cultivar seed lines for ability to germinate at 4°C. There ·was significant variation among control cultivars and among selected lines for germination rate index at 4°C. Cultivars from northern Europe had a higher germination rate index than cultivars from New Zealand, Australia and Israel. Selection for increased germination rate index at 4°C was successful and the relationship between germination rate …
Seed Production And Autumn Germination As Determinants Of The Success Of Subterranean Clover In A Cool Temperate Environment, M L. Smetham, S Hines, D W. Jack
Seed Production And Autumn Germination As Determinants Of The Success Of Subterranean Clover In A Cool Temperate Environment, M L. Smetham, S Hines, D W. Jack
IGC Proceedings (1977-2023)
A field experiment examined seed production and autumn germination of subterranean clovers (Trifolium subterraneum L.) In an area of New Zealand with a mean annual rainfall of 62S mm and dry summers. In the fourth autumn, out of 42 accessions, only 10 produced more than the 1000 seedlings/m2 and had seed reserves in excess of the 240 kg/ha considered necessary for success. Of the named cultivars only the early-flowering cv. Geraldton exceeded these thresholds whereas cv. Seaton Park, Woogenellup, Mount Barker and Tallarook did not. All lines had In excess of 50% hard seed 3 weeks after the autumn …
Aspects Of Interference Between Nodding Thistle (Carduus Nutans L.) And Pasture Grasses And Legumes, D A. Wardle, K S. Nicholson, A Rahman
Aspects Of Interference Between Nodding Thistle (Carduus Nutans L.) And Pasture Grasses And Legumes, D A. Wardle, K S. Nicholson, A Rahman
IGC Proceedings (1977-2023)
Nodding thistle (Carduus nutans L.) is an important weed species in New Zealand pastures. The available information on interactions between this species and forage grasses and legumes is summarised and discussed. Nodding thistle inhibits pasture productivity, and allclopathy is probably Important at inhibiting pasture at the later stages of its life cycle. Although, nodding thistle is most susceptible to inhibition by forage species early in its life cycle, a minimum pasture cover may be required for seedlings to establish. Nodding thistle therefore acts as a competitor only at the later stages of its development. Grasses arc both stronger at inhibiting …
Enhancing Crop Resilience: Physiological And Omics Approaches For Drought And Heat Stress Tolerance In Soybean And Peanut, Jyoti Prasad Kakati
Enhancing Crop Resilience: Physiological And Omics Approaches For Drought And Heat Stress Tolerance In Soybean And Peanut, Jyoti Prasad Kakati
All Dissertations
Soybean and peanut are two major crops globally grown for oil and protein. Climate change-associated factors like drought and increased temperature (heat stress) challenge the global production of soybeans and peanuts. Though the United States is the second-largest producer of soybean and the fourth-largest producer of peanuts, it still faces production constraints associated with drought and heat stresses. In the present study, we have examined the responses of soybean and peanut plants to drought and heat stresses during germination and reproductive phases. We conducted field and controlled environmental studies to elucidate the impact of drought stress on germination and seedling …
The Role Of Exogenous Gibberellic Acid (Ga3) Application In Breaking Seed Dormancy In Clematis Hirsutissima, Ashley Grace Ogle
The Role Of Exogenous Gibberellic Acid (Ga3) Application In Breaking Seed Dormancy In Clematis Hirsutissima, Ashley Grace Ogle
2024 Symposium
Seed germination in plants is controlled by several mechanisms, including the presence of phytohormones like gibberellins, as well as environmental conditions, such as temperature, light, and moisture. Germination of dormant seeds can be promoted by the exogenous application of Gibberellic Acid (GA3). GA3 acts as a natural endogenous regulator of dormancy. Clematis hirsutissima, commonly known as Sugarbowls, in the plant family Ranunculaceae, is an important perennial species that contributes to biodiversity in western prairie ecosystems by providing habitat for pollinators and wildlife; and it is also a species that shows characteristic embryo dormancy. This native to Washington, has been used …
Flowering Cycle-Related Seed Quality Parameters On 15 New Guineagrass (Panicum Maximum Jacq.) Hybrids, R Usberti, A Usberti Jr, R S. Paterniani
Flowering Cycle-Related Seed Quality Parameters On 15 New Guineagrass (Panicum Maximum Jacq.) Hybrids, R Usberti, A Usberti Jr, R S. Paterniani
IGC Proceedings (1977-2023)
Fifteen new guineagrass (Panicum maximum Jacq) hybrids, widely variable in flowering cycles, were tested for eleven seed quality parameters: seed viability (tetrazolium)-TZ; normal germination (with and without previous chemical scarification)-TG and NG; presence of viable seeds after the germination tests- RSTG and RSNG; seed dormancy-DTG and DNG; germination rate-TGR and NGR and seed vigor (after accelerated aging test) -AATG and AANG. The genetic materials used presented no significant differences for tetrazolium seed viability. Late- and intermediate-flowering genotypes showed the highest correlations between flowering cycle and seed quality for TG, NG, TGR and NGR (r= 0.468**; 0.731**; 0.422* and 0.683**, …
Seed Quality Of Five Native Grasses Of The Humid Argentine Pampa Prairie: Germination Conditions, L Ferrari, C A. Rossi
Seed Quality Of Five Native Grasses Of The Humid Argentine Pampa Prairie: Germination Conditions, L Ferrari, C A. Rossi
IGC Proceedings (1977-2023)
The aim of this study was to determine the germination conditions as well as an approach to seed quality of five native grasses of the humid Argentine Pampa prairie: Bothriochloa laguroides, Sporobolus indicus, Glyceria multiflora, Briza subaristata and Chaetotropis imberbis. They are considered as good and very good forage species. Mature inflorescences were sampled in Brandsen (Flooding Pampa sub-Region, Buenos Aires province, Argentina) from December, 1994 to March, 1995. A three factor completely randomized design with 4 replications was applied. Treatments combined prechilling (I: yes/II:no), KNO3 (A:yes/ B:no) and germination temperatures: 2 constant 15° and 20°C and 6 alternating 15-10°C, …