A Study On The Promising Ecotypes Of Secale Montaanum Guss.,
2024
University of Tehran
A Study On The Promising Ecotypes Of Secale Montaanum Guss., Bahram Peymani-Fard
IGC Proceedings (1977-2023)
Secale montamum (mountain rye) has been identified as a well-adapted species for rehabilitation of the substeppic rangelands of Iran. Further investigation on the quality and quantity values of different ecotypes of this species was required. The main objective of this study was to determine phenological stages, herbage yield and protein percentage of the promising native ecotypes of Secale montanum. This research was conducted on 7 ecotypes in which early growth started in late April and heading occurred in late May. Comparison of the 4-year total herbage yield indicated significant differences among the ecotypes, Secale momtanum (10091), which was the previously …
Breeding Systems Of Several Vicia Species,
2024
Auburn University
Breeding Systems Of Several Vicia Species, J A. Mosjidis, X Zhang
IGC Proceedings (1977-2023)
Lack of or limited knowledge of 1he breeding systems of most of the Vicia speci1;s in the National Plant Germplasm System (USA) makes difficult the regeneration of the accessions as well as the maintenance of their genetic variability. Twenty-three accessions of V. arliculata, V. benghalensis, V. cracca, V. ervilia, V. lutea, V. narbonensis, V. pamionica and V. villosa were grown in the field in 1989 and 1990. Some plants were left uncovered outside"cages until fully mature while others were enclosed in cages when the first flower buds appeared. Plowers of the plants placed inside cages were subjected to the following …
Forage Quality Determinants Of Mott Elephantgrass And Pennisetum Hybrids,
2024
University of Florida
Forage Quality Determinants Of Mott Elephantgrass And Pennisetum Hybrids, L E. Sollenberger, J E. Moore, J A. Flores-C, C J. Chaparro, B Macoon
IGC Proceedings (1977-2023)
Daily gains of cattle grazing Mott elephantgrass (MB; Pennisteum purpureIum Schum.) arc approximately twice those obtained on other warm-season perennial grasses grown in Florida, USA, but plant characteristics responsible for the high forage quality of MB have not been identified. Three experiments were conducted during 1987- 1991 to determine factors that explain the high forage quality of MB and to assess the quality potential of P. purpureum x P. glaucum (L.) [R.Br.J x clephantgrass hybrids. Higher organic matter (OM) digestibility and intake of MB than Pensacola bahiagrass (PB; Paspalum nonatum Flugge) were associated with a lesser percentage of sclercnchyma (1.6 …
Characterisation Of Us Collection Of Clover And Special Purpose Legume Germplasm,
2024
USDA, Agricultural Research Service
Characterisation Of Us Collection Of Clover And Special Purpose Legume Germplasm, R R. Smith, K H. Quesenberry
IGC Proceedings (1977-2023)
Systematic collection of forage legume germplasm by the USA from the centers of origin was initiated in the 1890s. Since then over 11 000 accessions of clover and special-purpose legume species have been introduced into the US. These accessions are catalogued and maintained by the National Plant Germplasm System with working collections located at 4 locations in the US. Appropriate passport and evaluation data are available in the US Germplasm Resources Information Network (GRIN). The Clover and Special Purpose Legume Crop Advisory Commitlee is responsible for providing advice to the National Plant Germplasm System on the collection, mnintenance, evaluation and …
Determination Of Extractable And Bound Condensed Tannins In Forage Species,
2024
AgResearch, NZ
Determination Of Extractable And Bound Condensed Tannins In Forage Species, G B. Douglas, P Donkers, A G. Foote, T N. Barry
IGC Proceedings (1977-2023)
The levels of condensed tannins (CT) in 12 herbaceous species growing at 2 sites were determined using a recently modified butanolHCL procedure. The method measured CT extractable in 70:30 acetone: water, and CT bound to protein and fibre, using ground, freeze-dried material. Total plant CT levels ranged from trace to 8% OM, with high concentrations (5-8% DM) being detected in 3 Dorycnium spp. and Lotus pedunculatus. Coronilla varia, Hedysarum coronarium and Lotus corniculatus had CT levels of 2-4% DM which may be appropriate for optimum nutritional value. CT content in ·n. rect11m, D. pe11taphyl/11m and L. pedunculatus was higher …
Herbaceous And Shrub Legumes Of Queensland: A Resource For Forage And Crop Improvement,
2024
CSIRO
Herbaceous And Shrub Legumes Of Queensland: A Resource For Forage And Crop Improvement, J B. Hacker
IGC Proceedings (1977-2023)
The potential for pasture or crop improvement of legume species native to Queensland, Australia is discussed. The most promising genera are Cajanus, Desmodlum, Glycine, Psoralea, Sesbanla and Vigna. Genera endemic to Australia offer little immediate scope for use in pasture or crop improvement. Some species, particularly in the genera Acacia, Crotalaria, Gastroloblum, Indigofera and Neptunia, can be toxic to livestock.
Morphological Characterization Of Brachiaria Germplasm,
2024
EMBRAPA-CNPGC
Morphological Characterization Of Brachiaria Germplasm, C B. Valle, B L. Maass, C B. Almeida, J.C G. Costa
IGC Proceedings (1977-2023)
Brachiaria is a grass genus native to the tropical savannas of Africa. It encompasses about 90 species, a: few of which have gained economic importance owing to their adaptation to acid soils. A study was conducted at Campo Grande, Brazil and Quilichao, Colombia, using a large Brachiaria collection assembled by CIAT in east Africa. The objectives were to describe the diversity of this germplasm and to classify the accessions in clusters based on 7 morphological characters, by applying numerical taxonomy. Principal Component and Cluster Analyses were used. Wide variation was observed among the 386 accessions of 13 different species in …
Potential Of European Perennial Ryegrass Germplasm In Southern New Zealand,
2024
AgResearch, NZ
Potential Of European Perennial Ryegrass Germplasm In Southern New Zealand, K H. Widdup, D L. Ryan
IGC Proceedings (1977-2023)
86 cullivars of perennial ryegrass from The Netherlands, Germany, Denmark, France and Britain together with 9 New Zealand (NZ) cultivars were evaluated for agronomic potential in the cool, temperate southern region of NZ. Spaced plants of each cultivar were established in 1989 and screened for seasonal growth, moiphological features, head emergence, foliar diseases and endophyte presence. Principal Component Analysis (PCA) was used to order the relative performance of the cultivars taking all characters into consideration. A group containing 5 elite tetraploid and 10 diploid European cultivars showed potential for improving the summer feed quality of ryegrass. These cultivars contained densely …
A Landino White Clover Breeding Programme In Northern Italy,
2024
Instituto Sperimentale per le Colture Foraggere
A Landino White Clover Breeding Programme In Northern Italy, P Annicchiarico, E Piano
IGC Proceedings (1977-2023)
Ladino wh ite clover (Trifolium repens L.) has traditionally been grown in pure stand rotational meadows throughout the Po Valley. Recent changes in the farming systems have drastically reduced the presence of this clover. Its rehabilitation depends on the cultivation of new, more productive cultivars in association with a grass. Thirtytwo ecotypes including both farm land races and natural populations were collected and evaluated for dry mailer yield (OM) and seed yield, Significant variability was found among these materials for both traits. Compared with natural populations, land races yielded far more seed and as much DM . Some aspects …
Screening Trifolium Repens L. And T. Pratense L. Germplasm For Resistance To Cylindrocladium Crotalariae (Loos) Bell & Sobers,
2024
University of Florida
Screening Trifolium Repens L. And T. Pratense L. Germplasm For Resistance To Cylindrocladium Crotalariae (Loos) Bell & Sobers, D S. Wofford, K H. Quesenberry
IGC Proceedings (1977-2023)
Using a greenhouse screening technique, 200 plant introduction Jines of white clover (Trifolium repens L.) and red clover (T. pratense L.) germplasm were evaluated for resistance to cylindrocladium root rot incited by Cyl/11drocladium crotalariae (Loos) Bell & Sobers. In general, white clover germplasm had much higher levels of resistance than red clover. Over 60% of white clover introductions had 30% or greater resistance to cylindrocladium root rot, with 21 % of the lines possessing more than 40% resistant plants. No relationship was found between level of resistance and geographic origin for white clover. Red clover was more susceptible to …
Domestication Of The Australian Perennial Native Grass, Microlaena Stipoides,
2024
University of New England
Domestication Of The Australian Perennial Native Grass, Microlaena Stipoides, R.D B. Whalley, C.H A. Huxtable
IGC Proceedings (1977-2023)
Microlaena stipoides (Labill.) R.Br. is a year-long green perennial grass which is common throughout eastern and southern Australia. This species is a valuable component of pastures in parts of the New South Wales Tablelands because of its tolerance of acid soils and its ability to survive recent droughts.
Contribution Of Undomesticated Germplasm To Development Of Persistent, Grazing-Tolerant Lucerne,
2024
South Australian Department of Agriculture
Contribution Of Undomesticated Germplasm To Development Of Persistent, Grazing-Tolerant Lucerne, I Kaehne, E T. Kobelt, J A. Horsenell
IGC Proceedings (1977-2023)
The development of lucerne (Medicago saliva L.) germplasms which are tolerant to continuous grazing, adapted to dryland agriculture in the mediterranean zone and resistant to aphids, is described, Undomesticated lucerne accessions from 14 countries were crossed with winter-active cultivated lucerne accessions adapted to mediterranean climates to produce 4 S populations which were selected for tolerance to continuous intense grazing by sheep, The most tolerant populations were screened to develop germplasms resistant to spotted alfalfa aphid and blue-green aphid. The 72 populations that were developed from these germplasms by further selection for grazing tolerance and aphid resistance were tested for …
Multilocational Testing Of Grasses And Legumes In The Humid Tropics Of South America,
2024
CIAT
Multilocational Testing Of Grasses And Legumes In The Humid Tropics Of South America, G Keller-Grein, M C. Amezquita, G Lema, L H. Franco
IGC Proceedings (1977-2023)
Adaptability of 5 grass and 13 legume accessions tested in 34 regional agronomic trials throughout the South American humid tropics was assessed by conducting a multilocational analysis on seasonal dry matter (DM) yield at 12 weeks regrowth. Among legumes, Stylosamhes guianensis CIAT 184 and 136, Desmodium ovaifolum CIAT 350, Zornia latifolla CIAT 728 and Centrosema macrocarpum CIAT 5065 were the highest yielding accessions in both rainfall periods and showed high adaptability to environmental conditions. Centrosema brasllianan CIAT 5234, C. pubescence CIAT 438 and Desmodiun heterophyifom CIAT 349 had low productivity and low adaptability. For grasses, Andropogon gayanus CIAT 621 outyielded …
Germplasm Collecting By Iger: The Future,
2024
AFRC
Germplasm Collecting By Iger: The Future, N R. Sackville Hamilton, K H. Chorlton, I D. Thomas, M D. Hayward
IGC Proceedings (1977-2023)
This paper will present novel approaches being implemented or planned lo improve future collections for forage germplasm, and to deal with changing priorities, with particular reference to Lolium perenne. With a large number of accessions already in the gene bank and providing a wide range of genes for possible utilisation, future collections must be targeted ever more precisely, The principle object is to acquire novel genes not already present in the gene bank, to maximise the proportion of genes in the gene pool of L. perenne that is held in the gene bank. A subsidiary object, to support not …
Phenotypic Variability For Morphological And Agronomic Traits In Atriplex And Medicago Shrubs Accessions,
2024
Instituto Sperimentale Colture Foraggere
Phenotypic Variability For Morphological And Agronomic Traits In Atriplex And Medicago Shrubs Accessions, M Pasquale, L Nicola
IGC Proceedings (1977-2023)
The phenotypic variability for morphological and biological traits in 139 accessions of Atriplex hallmus L. and in 54 of Medicago arborea L. were evaluated. The accessions were collected from Meditenanean locations. Accessions of Atriplex were evaluated for 3 cuts (winter, spring and summer) and Medicago for 2 (winter and spring). The variability in both species was remarkable for all traits examined: In Alrlplex accessions it was related to the different origin of the materials (Sardinian and other Mediterranean environments),
Germplasm Collection, Evaluation And Selection Of Naturalized Medicago Polymorpha In The Mediterranean Zone Of Chile, C Ovalle, J Avendano, A Del Pozo, D Crespo
IGC Proceedings (1977-2023)
An introduction and evaluation programme is described that thus far includes 53 accessions of the naturalised annual medic Medicago polymorplia L. collected along a 1000 km N-S gradient in central. Chile and subsequently grown together in a common environment· selection trial together with 5 accessions received from International Center for Agricultural Research in the Dry Areas (!CARDA). Major selection criteria include: precocious phenology, spineless pods and hardseededness, and tolerance to acid soils. Onset of flowering was 82-127 day_s, later flowering being closely correlated with higher latitudes. Soil pH was 5.3-7 .5 in collection sites, and phosphorus levels were > 10 ppm …
Alfalfa Energetic Value Improvement For Dairy Cows,
2024
INRA
Alfalfa Energetic Value Improvement For Dairy Cows, M Ghesquiere, Jean Claude Emile, G Genier, P Guy
IGC Proceedings (1977-2023)
An experimental alfalfa (Medicago saliva L.) population whose in vitro and in vivo digestibilities are significantly higher than controls was offered to dairy cows in order to investigate its efficiency for· feeding high yielding dairy cattle. Three trials were conducted on first or second cut. Alfalfa was given ad lib. and as fresh forage. The improved digestibility was confirmed. The experimental type was ingested more by cows despite a lower dry matter content and allowed higher milk production. This result shows a real genetic variability for energetic value in alfalfa.
Improving Methods Of Selecting Tropical Germplasm For Plant Breeding And Species Evaluation Studies,
2024
CSIRO
Improving Methods Of Selecting Tropical Germplasm For Plant Breeding And Species Evaluation Studies, B C. Pengelly, R J. Williams
IGC Proceedings (1977-2023)
Tropical forage germplasm centres have now accumulated very large collections of grass and legume species. The current methods of selecting germplasm from these collections, however, are based on limited information and tend to restrict the total germplasm pool from which selections can be made. To improve the selection process, genetic resource centres need to develop research programmes which both improve our understanding of the relative importance of particular plant attributes and the diversity of these attributes within collections.
Variability In Plant Morphology And Seed Production Of Sardinian Germplasm Of Burr Medic (Medicago Polymorpha L.),
2024
Centro di Studio sul Migliomento della Produtivia dei Pascoli
Variability In Plant Morphology And Seed Production Of Sardinian Germplasm Of Burr Medic (Medicago Polymorpha L.), C Porqueddu, A Loi, F Veronesi
IGC Proceedings (1977-2023)
A germplasm collection was undertaken in Sardinia (Italy) to study the ecology and distribution of burr medic to obtain genetic material to start a breeding programme. Burr medic was found at 0-1000 m (asl), in all types of soil with a pH between 5 and 8,5, Most populations were classified as var. v11lgarls Shin., but a few of them were polymorpha and brevbpl11a Heyn, The morphological characteristics of the plants, pods and seed showed a height variability between populations, The average number of pods per plant was 331 (min. 40 - max. 599), average number of seeds in each pod …
Use Of Ecogeographical Factors For Sampling A Core Collection Of Perennial Ryegrass,
2024
INRA
Use Of Ecogeographical Factors For Sampling A Core Collection Of Perennial Ryegrass, F Balfourier, G Charmet, C Grand-Ravel
IGC Proceedings (1977-2023)
In order to set up a core collection of wild populations of pei:ennial ryegra11 {Lolium perenne L.), 3 different criteria have been combined lo make a choice of populations: similarities between populations, geographic location and ecological characteristics of their original sites. Different multivariate analysis and clustering methods, introducing a geographic contiguity CXJnstnint were used to sample, among a set of 550 Prench wild populations, 114 populations 111 representative as po11ible of the whole variability.
