Open Access. Powered by Scholars. Published by Universities.®
- Discipline
Articles 1 - 23 of 23
Full-Text Articles in Life Sciences
In Vitro Culture Of Several Rice Cultivars, A. F. Mirlohi, Lyell F. Thompson, R. H. Dilday, Feng H. Huang, Jameel M. Al-Khayri
In Vitro Culture Of Several Rice Cultivars, A. F. Mirlohi, Lyell F. Thompson, R. H. Dilday, Feng H. Huang, Jameel M. Al-Khayri
Journal of the Arkansas Academy of Science
Tissue culture methods have been established to regenerate certain rice (Oryza sativa L) cultivars, but regeneration of the rice cultivars widely grown in Arkansas has not been reported. This study has established an in vitroculture for the rice cultivars 'Nortai', 'Starbonnet', 'Mars', Tebonnet', 'Newbonnet', and 'Lemont'. Callus was induced in the dark at either 20 or 28 C from dehusked seeds cultured on Murashige and Skoog (MS) medium (Murashige and Skoog, 1962) containing 40 g L^-1 sucrose, 10 g L^1 agar, 0.5, 1.0, or 2.0 mg L^-1 1 2,4-dichlorophenoxyacetic acid (2,4-D) and adjusted to pH 5.7. After four weeks the …
Characterization Of Rice (Oryza Sativa L.) Roots Versus Root Pulling Resistance As Selection Indices For Draught Tolerance, Mazo Price, R. H. Dilday, Arthur L. Allen
Characterization Of Rice (Oryza Sativa L.) Roots Versus Root Pulling Resistance As Selection Indices For Draught Tolerance, Mazo Price, R. H. Dilday, Arthur L. Allen
Journal of the Arkansas Academy of Science
A technique described as Root Pulling Resistance (RPR) was used to evaluate genotypic differences in root growth and development of 50 rice germplasm accessions and cultivars. Several root characteristics in rice are associated with drought tolerance and avoidance capability of plants. The RPR measurements showed a significant positive correlation with maximum root length (r=0.69), root thickness (r=0.75), branching number (r=0.75), and root dry weight (r= 0.82). Rice genotypes that had a high RPR value were identified as having longer, thicker, and denser root systems. The data indicated that high RPR measurements are strongly correlated with greater root penetration. Munji Sufaid …
Reproduction In The Wood Frog, Rana Sylvatica (Anura: Ranidae), From Arkansas, Stanley E. Trauth, Michael E. Cartwright, Walter E. Meshaka Jr.
Reproduction In The Wood Frog, Rana Sylvatica (Anura: Ranidae), From Arkansas, Stanley E. Trauth, Michael E. Cartwright, Walter E. Meshaka Jr.
Journal of the Arkansas Academy of Science
No abstract provided.
Rediscovery Of Halesia Diptera Ellis (Styracaceae) In Arkansas, Raymond G. Erickson
Rediscovery Of Halesia Diptera Ellis (Styracaceae) In Arkansas, Raymond G. Erickson
Journal of the Arkansas Academy of Science
No abstract provided.
Arkansas' Incendiary Wildfire Record: 1983-1987, Richard A. Kluender, L. C. Thompson, R. J. Mcfarland, D. M. Steigerwald
Arkansas' Incendiary Wildfire Record: 1983-1987, Richard A. Kluender, L. C. Thompson, R. J. Mcfarland, D. M. Steigerwald
Journal of the Arkansas Academy of Science
All wildfire reports from lands protected by the Arkansas Forestry Commission for the calendar years 1983 through 1987 were studied. The number of wildfires steadily increased from 2,185 in 1983 to 4,150 in 1987, burning a total of 27,146 hectares in 1987. Incendiarism on forested lands in 1987 comprised 77% of the total fires and 84% of the area burned. Incendiarism was responsible for 40% of all fires and 60% of the area burned in 1983, but increased to 54% of all fires and 69% of the area burned in 1987. In 1987, 80% of all incendiary fires on industry …
Allelopathic Observations In Rice (Oryza Sativa L.) To Ducksalad (Heteranthera Limosa), R. H. Dilday, Paolo Nastasi, Roy J. Smith Jr.
Allelopathic Observations In Rice (Oryza Sativa L.) To Ducksalad (Heteranthera Limosa), R. H. Dilday, Paolo Nastasi, Roy J. Smith Jr.
Journal of the Arkansas Academy of Science
More than 50 weed species infest drill-seeded rice in the U.S. and one of the most prevalent aquatic weeks is ducksalad (Heteranthera limosa). During the summer of 1988, a field experiment was conducted to identify rice accessions from the USDA/ARS rice germplasm collection for allelopathic effects to ducksalad. In this field experiment, 5,000 accessions were evaluated for allelopathic activity. Five to seven seeds of each rice accession were planted in hills about 75cm apart in two replications. Allelopathic activity was recorded as 1) radius of the area affected by allelochemical from the base of the rice plant and 2) percentage …
Bats Of The Ouachita Mountains, David A. Saugey, Darrell R. Heath, Gary A. Heidt
Bats Of The Ouachita Mountains, David A. Saugey, Darrell R. Heath, Gary A. Heidt
Journal of the Arkansas Academy of Science
A survey was conducted from June, 1982 through January, 1989 to determine the occurrence of bat species in the Ouachita Mountain region of west-central Arkansas and southeastern Oklahoma, with emphasis on censusing lands managed by the USDA Forest Service, Ouachita National Forest. Seven genera and 13 species of bats in the families Vespertilionidae and Molossidae were captured. Species represented included: Eptesicus fuscus, Lasionycteris noctivagans, Lasiurus borealis, Lasiurus cinereus, Lasiurus seminolus, Myotis austroriparius, Myotis keenii, Myotis leibii, Myotis lucifugus, Myotissodalis, Nycticeius humeralis, Pipistrellus subflavus, and Tadarida brasiliensis cynocephala.
Mammals Of Southwestern Arkansas Part Ii. Rodents, Tim W. Steward, V. Rick Mcdaniel, Daniel R. England
Mammals Of Southwestern Arkansas Part Ii. Rodents, Tim W. Steward, V. Rick Mcdaniel, Daniel R. England
Journal of the Arkansas Academy of Science
This study investigated the composition and habitat affinities of the mammalian fauna of southwestern Arkansas. The study area was comprised of the 21 counties located south and/or west of and including Pulaski County. The previously existing data set pertaining to the mammals of Arkansas was notably incomplete and this study area in particular, was poorly known mammalogically. Specimens were collected by standard trapping and salvage methods throughout the study area. The mammals considered during this study were limited to those species meeting a set of criteria designed to eliminate species that had been introduced or artificially maintained. This study has …
Photoreactivation Of The Effect Of Uv Light On Gamma Ray Induced Chromosome Aberration Production In G1 Phase Xenophus Cells, Rebecca Rowe, H. Gaston Griggs
Photoreactivation Of The Effect Of Uv Light On Gamma Ray Induced Chromosome Aberration Production In G1 Phase Xenophus Cells, Rebecca Rowe, H. Gaston Griggs
Journal of the Arkansas Academy of Science
No abstract provided.
Photoreactivation Of Chromatid Deletions Induced By Uv-Irradiation Of G1 Phase Hamster X Xenophus Hybrid Cells, Joel Staggers, H. Gaston Griggs
Photoreactivation Of Chromatid Deletions Induced By Uv-Irradiation Of G1 Phase Hamster X Xenophus Hybrid Cells, Joel Staggers, H. Gaston Griggs
Journal of the Arkansas Academy of Science
No abstract provided.
Floristic Notes On The Arkansas Cruciferae (Brassicaceae), Edwin B. Smith
Floristic Notes On The Arkansas Cruciferae (Brassicaceae), Edwin B. Smith
Journal of the Arkansas Academy of Science
No abstract provided.
Preliminary Evaluation Of A Dodder Anthracnose Fungus From China As A Mycoherbicide For Dodder Control In The Us, D. K. Cartwright, George E. Templeton
Preliminary Evaluation Of A Dodder Anthracnose Fungus From China As A Mycoherbicide For Dodder Control In The Us, D. K. Cartwright, George E. Templeton
Journal of the Arkansas Academy of Science
Dodder (Cuscuta spp.) is a noxious, parasitic, annual weed throughout most of the United States. A fungus used to control it in China was imported under permit for studies with U.S. dodder species in containment. The fungus, Colletotrichum gloeosporioides, sporulated on liquid and solid media at room temperature. Conidia from 7-12 day old cultures were diluted to 3.5 to 7 X 16⁶ spores ml^-1 for host range inoculations. Germination on water agar at 24 hrs was higher at 28 than 30 or 24 C. Inoculated plants were exposed to dew periods of 12-1 4 hrs at 24 or 28 C, …
Genetic And Plant Growth Regulator Manipulation Of Rice (Oryza Sativa L.) Mesocotyl And Coleoptile Lengths, R. S. Helms, R. H. Dilday, M. A. Mgonja, S. Amonsilpa
Genetic And Plant Growth Regulator Manipulation Of Rice (Oryza Sativa L.) Mesocotyl And Coleoptile Lengths, R. S. Helms, R. H. Dilday, M. A. Mgonja, S. Amonsilpa
Journal of the Arkansas Academy of Science
Significant differences in mesocotyl lengths of semidwarf and non-semidwarf rice (Oryza sativa L.) cultivars were observed. However, the relationship between plant height and mesocotyl length was found to be due to linkage rather than pleiotropism. Seed treatments of gibberellic acid (GA₃) significantly increased mesocotyl and coleoptile lengths in the laboratory study. The GA₃ seed treatments significantly increased stand density compared to the untreated control in the field study. However, no significant differences were observed for plant height at maturity or grain yields among the GA₃ treatments or the untreated control.
Age Assessment Of White Bass From Otoliths, Dorsal Spines And Scales, Raj V. Kilambi, Thoniot T. Prabhakaran
Age Assessment Of White Bass From Otoliths, Dorsal Spines And Scales, Raj V. Kilambi, Thoniot T. Prabhakaran
Journal of the Arkansas Academy of Science
Otoliths, dorsal spines, and scales of 85 white bass collected in1987 from a pre-spawning group were used forage assessment. Agreement between spine and otolith ages were 78.3%, between scale and otolith ages was 68.2%. Unlike spine ages, percent agreement of scale ages with otolith ages decreased from small to large fish. Length-frequency analysis in conjunction with ages assessed by the three calcified structures showed that dorsal spines and scales underestimated white bass ages compared to the otoliths. Clarity of the otolith annuli, even of the older fish, makes them a reliable source for white bass age assessment.
Distribution And Status Of Shrews In Arkansas, Diana A. Garland, Gary A. Heidt
Distribution And Status Of Shrews In Arkansas, Diana A. Garland, Gary A. Heidt
Journal of the Arkansas Academy of Science
Between January, 1988 and February, 1989 a total of 1300 pitfall traps were placed in 150 sites covering 43 counties in Arkansas. Over 290 small mammals and numerous amphibians, lizards, tortoises, and invertebrates were captured. Shrews accounted for167 of the small mammals, and included Blarina carolinensis (116), Cryptotis parva (48), and Sorex longirostris (3). B. carolinensis is abundant in all habitats in the southeastern two-thirds of the state, C. parva is common statewide in grassy or brushy areas, and S. longirostris is considered to be uncommon, but is found in a variety of habitats. B. hylophaga, although not targeted, is …
Mammals Of Southwestern Arkansas Part Iii. Carnivores, Tim W. Steward, V. Rick Mcdaniel, Daniel R. England
Mammals Of Southwestern Arkansas Part Iii. Carnivores, Tim W. Steward, V. Rick Mcdaniel, Daniel R. England
Journal of the Arkansas Academy of Science
This study investigates the composition of the carnivore fauna of southwestern Arkansas and presents data on habitat affinities. The study area is comprised of the 21 counties located south and/or west of and including Pulaski County. The previously existing data set pertaining to the mammals of Arkansas was notably incomplete and the study area, in particular, was poorly known mammalogically. Specimens were collected by standard trapping and salvage methods throughout the study area. Species considered during this study were limited to those meeting a set of criteria designed to eliminate species that had been introduced or artificially maintained. This study …
Distributional Survey Of Eastern Collared Lizard, Crotaphytus Collaris Collaris (Squamata: Iguanidae), Within The Arkansas River Valley Of Arkansas, Stanley E. Trauth
Distributional Survey Of Eastern Collared Lizard, Crotaphytus Collaris Collaris (Squamata: Iguanidae), Within The Arkansas River Valley Of Arkansas, Stanley E. Trauth
Journal of the Arkansas Academy of Science
A distributional survey of the eastern collared lizard, Crotaphytus collaris collaris, was conducted in the Arkansas River Valley of Arkansas during the summer of 1988. Thirty-four sites in 10 counties were searched. Only three localities yielded colonies of lizards; all were found south of the Arkansas River. This species has a discontinuous distribution in central Arkansas; habitat depletion and overzealous collection may have contributed to the extirpation of lizards at formerly-reported localities in the Arkansas River Valley of Arkansas.
Reproduction Of Lindera Melissafolia In Arkansas, Robert D. Wright
Reproduction Of Lindera Melissafolia In Arkansas, Robert D. Wright
Journal of the Arkansas Academy of Science
Field reproduction was investigated in several populations of the endangered dioecious species Lindera melissifolia. Fruit set was light and erratic, and even where fruiting was heavy no effective seed bank was found. Field transplantation of greenhouse-grown seedlings was successful for one growing season. Rhizome sprouting was widespread, and produced rapid recovery from fire. Without enhancement of natural reproduction, the species will probably decline.
Synopsis Of The Laccophilinae (Coleoptera: Dytiscidae) Of Arkansas, Mitchell K. Marks, George L. Harp
Synopsis Of The Laccophilinae (Coleoptera: Dytiscidae) Of Arkansas, Mitchell K. Marks, George L. Harp
Journal of the Arkansas Academy of Science
No abstract provided.
Preliminary Survey Of The Collemba Of Magazine Mountain, Logan Co., Arkansas, S. A. Tedder, Robert T. Allen
Preliminary Survey Of The Collemba Of Magazine Mountain, Logan Co., Arkansas, S. A. Tedder, Robert T. Allen
Journal of the Arkansas Academy of Science
No abstract provided.
Dental Pathology In Selected Carnivores From Arkansas, C. Renn Tumlison, J. D. Wilhide, V. Rick Mcdaniel
Dental Pathology In Selected Carnivores From Arkansas, C. Renn Tumlison, J. D. Wilhide, V. Rick Mcdaniel
Journal of the Arkansas Academy of Science
The occurrence and kinds of dental pathology in wild carnivore populations in Arkansas were investigated through examination of 1295 skulls of bobcat (Felis rufus), river otter (Lutra canadensis), gray fox (Urocyon cinereoargenteus), coyote (Canis latrans), and raccoon (Procyon lotor). Pulpitis or abscesses in broken or otherwise exposed teeth were noted in all species, but bobcats had the fewest exposures while otter and gray foxhad the most. Osteomyelitis occurred in all species except the bobcat. Caries were noted in the coyote, raccoon, and gray fox. Otter and coyote had alveolar thinning, and coyote had enamel dysplasia and maxillary sinusitis.
Female Reproductive Traits Of The Southern Leopard Frog, Rana Sphenocephala (Anura: Ranidae), From Arkansas, Stanley E. Trauth
Female Reproductive Traits Of The Southern Leopard Frog, Rana Sphenocephala (Anura: Ranidae), From Arkansas, Stanley E. Trauth
Journal of the Arkansas Academy of Science
Reproductive characteristics of female southern leopard frogs (Rana sphenocephala) were studied from specimens collected in northeastern Arkansas. Egg masses collected from breeding habitats were also examined. A communal ovipositional site was discovered in March 1988 and possessed over 75 egg masses within a 3 m square area. Clutch size from necropsied females averaged 2958.7 eggs, whereas number of eggs per egg mass averaged 2106.5 eggs. Egg diameter averaged 1.76 mm and was similar to populations reported previously in Texas. Positive correlations existed between mean ovum size and female body size and between clutch size and female body size. Negative correlations …
Reproduction And Larval Development In The Marbled Salamander, Ambystoma Opacum (Caudata: Ambystomatidae), From Arkansas, Stanley E. Trauth, Walter E. Meshaka Jr., Brian P. Butterfield
Reproduction And Larval Development In The Marbled Salamander, Ambystoma Opacum (Caudata: Ambystomatidae), From Arkansas, Stanley E. Trauth, Walter E. Meshaka Jr., Brian P. Butterfield
Journal of the Arkansas Academy of Science
Field investigations of the reproductive biology and larval growth and development in Ambystoma opacum from northeastern Arkansas began in early October, 1987 at the onset of nesting activities, and concluded in early May, 1988 when larval transformation occurred. The onset and timing of clutch deposition were documented. Clutch size averaged 107.1 eggs and was not significantly correlated with snout- vent length (SVL). The incubation period was estimated to be 90 days. Larvae grew at an average rate of 6.3 mm SVL per month. Metamorphosis, in early May, occurred at an average SVLof 30.5 mm. Larval development was recorded by noting …