Download or read book Field Studies of the Water Relations and Growth Responses of Soybean Glycine Max L Merr Bragg Grown Under Different Water Regimes in CO2 enriched Atmospheres written by Stephen Arthur Prior and published by . This book was released on 1986 with total page 346 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Agronomy Abstracts written by and published by . This book was released on 1987 with total page 308 pages. Available in PDF, EPUB and Kindle. Book excerpt: Includes abstracts of the annual meetings of the American Society of Agronomy; Soil Science Society of America; Crop Science Society of America ( - of its Agronomic Education Division).
Download or read book Water Stress Effects on Physiological Processes and Yield of Soybeans written by Mahmoud Fadl El Mula Ahmed and published by . This book was released on 1983 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt: Soybeans [Glycine max (L.) Merr.] cv. Bragg were grown in field lysimeters for the study of water stress effects on certain physiological characteristics during different growth periods. A second objective was to study changes in plant water relations of well-irrigated soybeans during the growing season. Mid-day measurements were taken for soil water potential, leaf water potential components, stomatal diffusive resistence, transpiration, and leaf temperature. In well-irrigated plants, leaf osmotic potential began to decline with the onset of flowering, causing a considerable decrease in the leaf water potential. Mid-day turgor potential maintained hight values (5 to 8 bars) throughout the growing season. Diffusive resistence, transpiration rates, and leaf-to-air temperature differential (leaf temperature minus air temperature) were also constant util after R[indice]5, when diffusive resistance began to increase, transpiration rates decreased and temperature differential increased. This was related to plant aging as the crop approached the late reproductive growth stages. As estomatal diffusive resistance increased, transpiration cooling was less resulting in increased temperature differentials. During the drying cycles, leaf water potential componentes of the stressed plants were, in most cases, lower than teh control plants. Transpiration rates and stomatal conductance were also lower in the stressed plants while leaf-to-air temperature differential was greater. A high correlation was observed between osmotic potential and leaf water potential during drying cycles and was most likely associated with dehydration effect which resulted in increased concentrations of the osmotic components. However, osmotic potential at full turgor (leaf water potential equal to zero), showed progressive decreases during the season, giving values of -9.4, -10.9, -11.6 and -15.1 bars at V[indice]5, R[indice]1, R[indice]5 and R[indice]6 stages, respectively. This reflects changes in osmotic potential of soybeans as they grow from vegetative to reproductive phases. The slope of [phi][indice][pi] versus [phi][indice]L also declined from 0.437 at V[indice]5 to 0.233 at R[indice]6, suggesting reduced plasticity during late reproductive stages. Moisture strees during R[indice]6 resulted in significant diferences in harvest index, 100-seed weigth, percent empty pods, and shelling percentage as compared to the well-watered control. No significant differences in seed yield were observed; however, the data suggests yield reductions of 12%, 13% and 14% due to water withholding during V[indice]5, V[indice]5 plus R[indice]5, and R[indice]6 growth periods, respectively.
Download or read book Interactive Effects of Elevated Carbon Dioxide Concentration and Water Availability on Field grown Soybean Glycine Max written by and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effects of Carbon Dioxide on the Physiology and Biochemistry of Photosynthesis in Soybean written by William Campbell and published by . This book was released on 2019-05-31 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: In three consecutive years (1983, 1984, and 1985) soybeans (Glycine max L. Merr. cv Bragg) were grown from seed to maturity in six outdoor environmentally controlled plant growth chambers under natural solar irradiance. The C0 2 concentrations inside the chambers were controlled to various levels during these studies. Both field and laboratory measurements were made to investigate the effects of CO2 concentration on photosynthesis. Emphasis was placed on the response to C0 2 of ribulose 1, 5-bisphosphate (RuBP) and RuBP carboxylase (RuBPCase), the substrate and enzyme of the carbon fixation reaction in soybean. Following growth at 330 (atmospheric concentration) or 660 ul CO2 1, leaflet photosynthetic rates were always greater for the elevated Od^ grown plants when measured over a wide range of COn concentrations. This enhanced capacity for photosynthesis was possibly a result of changes in internal leaf anatomy, or to greater assimilate demand, or both, in the high CO- grown plants. The RuBP concentration decreased with increasing CCL, but still appeared to be greater than the active site concentration of RuBPCase. The RuBPCase activity, expressed on an area basis, was not affected by growth CCL concentration. It appears that RuBPCase and RuBP are thus not involved significantly in the enhanced photosynthetic capacity. Evaporative cooling kept leaf temperatures from reaching the higher air temperatures during studies on temperature effects on soybean grown at atmospheric and twice atmospheric concentrations of C0". Although air temperatures were increased by approximately 5 and 10°C, leaf temperatures were usually not increased more than approximately 2.5 and 4.5°C, respectively. These leaf temperature increases were not great enough to affect canopy photosynthesis or RuPBCase activity (on a chlorophyll basis) in either CCL treatment. Canopy photosynthesis was, however, greater at the higher CCL concentration. The concentration of RuBP was reduced at higher temperatures. Increasing growth CCL concentrations (from 160 to 990 jul CCL 1 ) resulted in decreasing RuBPCase activities and RuBP levels, when both were expressed on a chlorophyll basis. At the higher C0" concentrations, the concentration of RuBP appeared to approach the concentration of RuBPCase active sites. Both the apparent K (C0? ) and V of RuBPCase showed small, but statistically significant, decreases with increasing C0" Dissertation Discovery Company and University of Florida are dedicated to making scholarly works more discoverable and accessible throughout the world. This dissertation, "Effects of Carbon Dioxide on the Physiology and Biochemistry of Photosynthesis in Soybean" by William J. Campbell, was obtained from University of Florida and is being sold with permission from the author. A digital copy of this work may also be found in the university's institutional repository, IR@UF. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation.
Download or read book Water relations of the soybean Glycine max L Merr cv Kent with special reference to water stress and evapotranspiration written by David Stacey Manning and published by . This book was released on 1975 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effects of Carbon Dioxide on the Physiology and Biochemistry of Photosynthesis in Soybean written by William J. Campbell and published by . This book was released on 1986 with total page 362 pages. Available in PDF, EPUB and Kindle. Book excerpt: In three consecutive years (1983, 1984, and 1985) soybeans (Glycine max L. Merr. cv Bragg) were grown from seed to maturity in six outdoor environmentally controlled plant growth chambers under natural solar irradiance. The C0 2 concentrations inside the chambers were controlled to various levels during these studies. Both field and laboratory measurements were made to investigate the effects of CO2 concentration on photosynthesis. Emphasis was placed on the response to C0 2 of ribulose 1, 5-bisphosphate (RuBP) and RuBP carboxylase (RuBPCase), the substrate and enzyme of the carbon fixation reaction in soybean. Following growth at 330 (atmospheric concentration) or 660 ul CO2 1, leaflet photosynthetic rates were always greater for the elevated Od^ grown plants when measured over a wide range of COn concentrations. This enhanced capacity for photosynthesis was possibly a result of changes in internal leaf anatomy, or to greater assimilate demand, or both, in the high CO- grown plants. The RuBP concentration decreased with increasing CCL, but still appeared to be greater than the active site concentration of RuBPCase. The RuBPCase activity, expressed on an area basis, was not affected by growth CCL concentration. It appears that RuBPCase and RuBP are thus not involved significantly in the enhanced photosynthetic capacity. Evaporative cooling kept leaf temperatures from reaching the higher air temperatures during studies on temperature effects on soybean grown at atmospheric and twice atmospheric concentrations of C0,. Although air temperatures were increased by approximately 5 and 10°C, leaf temperatures were usually not increased more than approximately 2.5 and 4.5°C, respectively. These leaf temperature increases were not great enough to affect canopy photosynthesis or RuPBCase activity (on a chlorophyll basis) in either CCL treatment. Canopy photosynthesis was, however, greater at the higher CCL concentration. The concentration of RuBP was reduced at higher temperatures. Increasing growth CCL concentrations (from 160 to 990 jul CCL 1~) resulted in decreasing RuBPCase activities and RuBP levels, when both were expressed on a chlorophyll basis. At the higher C0, concentrations, the concentration of RuBP appeared to approach the concentration of RuBPCase active sites. Both the apparent K (C0?) and V of RuBPCase showed small, but statistically significant, decreases with increasing C0.
Download or read book Responses of Two Soybean Glycine Max L Merrill Cultivars to Two Different Moisture Regimes written by Ruth Piatak Moradi and published by . This book was released on 1987 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Physiological Responses of Selected Soybean Cultivars Glycine Max L Merrill Under Different Water Regimes written by Moe Myo Tint Aung and published by . This book was released on 2011 with total page 314 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Yield and Development of Soybeans Glycine Max L as Affected by Irrigation with Municipal Wastewater and Well Water written by Michael J. Cordonnier and published by . This book was released on 1981 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Soil plant water Relations Growth and Nutrient Uptake Patterns of Field grown Soybeans Under Moisture Stress written by M. V. K. Siva Kumar and published by . This book was released on 1977 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Effect of Root Genotype on the Water Relations of Soybean Glycine Max L Merril written by Timothy P. Sullivan and published by . This book was released on 1972 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effects of Water Stress Timing in the Field on Growth Yield and Water Use Efficiency of Soybeans Glycine Max L of Varying Growth Habit written by Mohammad Reza Neyshabouri and published by . This book was released on 1982 with total page 484 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Response of Soybeans Glycine Max L Merrill to Soil Water Stress During Different Stages of Growth written by Clarence Johnson and published by . This book was released on 1973 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Shoot and Root Growth of Soybean G l y c i n e M a x L Merr Under Water Stress written by Gerrit Hoogenboom and published by . This book was released on 1985 with total page 530 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Evaluation of Soybean Glycine Max L Merr Root Development in Greenhouse Solution Culture and the Relationship to Drought Tolerance in the Field written by Lynn Liane Scherbert and published by . This book was released on 1985 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Plasticity of Soybean Glycine Max l Merrill Root Development Under Mild Water Deficits written by Yong He and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Drought is the major abiotic factor limiting soybean yield in the US. Under water deficit conditions, root systems may exhibit developmental plasticity resulting in morphological changes that extend the water-absorbing surface area of the roots. The objective of this study was to identify soybean genotypes which exhibit genetic diversity in root system developmental plasticity in response to water deficits, in order to enable physiological and genetic analyses of the regulatory mechanisms involved. Studies were conducted both at the seedling stage under precisely-controlled water deficits, and during three-week soil drying treatments of plants growing in 1.5 m-deep soil cylinders in controlled-environment chambers. Using the seedling system, 11 soybean genotypes selected from both domestic and Plant Introduction lines were studied. The results showed substantial genetic diversity in the capacity for increased lateral root development (number and total length of roots produced) and in the responses of overall root and shoot growth under water deficit conditions. Studies of the spatial and temporal patterns of lateral root development showed that the promotion of lateral root length under water deficit conditions was due to an increased root production rate rather than earlier initiation or promotion of root elongation. Genotypes with either superior or inferior root plasticity responses at the seedling stage were selected for more detailed studies using the deeper soil cylinder system with more mature plants. The results showed consistent genetic differences in lateral root developmental plasticity under water deficit conditions between the seedling and more mature plant systems.
