The Experts below are selected from a list of 47634 Experts worldwide ranked by ideXlab platform
James J. Germida - One of the best experts on this subject based on the ideXlab platform.
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Growth promotion of winter wheat by fluorescent pseudomonads under Growth Chamber conditions
Soil Biology and Biochemistry, 1992Co-Authors: J. R. De Freitas, James J. GermidaAbstract:Abstract The efficacy of Pseudomonas cepacia R85, P. putida R104 and R105, and P. fluorescens R111 and their rifampicin-nalidixic acid resistant (Rifr Nalr) counterparts to enhance the Growth of winter wheat (Triticum aestivum L. var Norstar) was assessed in two soils under simulated fall conditions (at 5°C) in a Growth Chamber. Bacterial colonization and survival on wheat roots, and the effects of inoculation on plant yield, total-P, total-Fe and 15N-uptake from fertilizer were determined. Introduced Rifr Nalr pseudomonads colonized and survived on the plant roots throughout the 150-day study. Some wild-type and their Rifr Nalr mutants enhanced early plant biomass of winter wheat in a low-fertility Dark Brown Chernozemic soil, whereas grain yield was enhanced by 46–75% in a more fertile Ortho Black Chemozemic soil. Inoculation also affected the uptake of fertilizer N and soil Fe by winter wheat in both soils. Our results show that some fluorescent pseudomonads and their Rifr Nalr mutants stimulated Growth and nutrient uptake of vernalized winter wheat, although the response to inoculation was dependent on soil characteristics. The use of Rifr Nalr marked bacteria allowed root colonization and population dynamics of inoculants in the rhizosphere of winter wheat to be studied, and may facilitate plant-inoculant studies under field conditions.
J. R. De Freitas - One of the best experts on this subject based on the ideXlab platform.
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Growth promotion of winter wheat by fluorescent pseudomonads under Growth Chamber conditions
Soil Biology and Biochemistry, 1992Co-Authors: J. R. De Freitas, James J. GermidaAbstract:Abstract The efficacy of Pseudomonas cepacia R85, P. putida R104 and R105, and P. fluorescens R111 and their rifampicin-nalidixic acid resistant (Rifr Nalr) counterparts to enhance the Growth of winter wheat (Triticum aestivum L. var Norstar) was assessed in two soils under simulated fall conditions (at 5°C) in a Growth Chamber. Bacterial colonization and survival on wheat roots, and the effects of inoculation on plant yield, total-P, total-Fe and 15N-uptake from fertilizer were determined. Introduced Rifr Nalr pseudomonads colonized and survived on the plant roots throughout the 150-day study. Some wild-type and their Rifr Nalr mutants enhanced early plant biomass of winter wheat in a low-fertility Dark Brown Chernozemic soil, whereas grain yield was enhanced by 46–75% in a more fertile Ortho Black Chemozemic soil. Inoculation also affected the uptake of fertilizer N and soil Fe by winter wheat in both soils. Our results show that some fluorescent pseudomonads and their Rifr Nalr mutants stimulated Growth and nutrient uptake of vernalized winter wheat, although the response to inoculation was dependent on soil characteristics. The use of Rifr Nalr marked bacteria allowed root colonization and population dynamics of inoculants in the rhizosphere of winter wheat to be studied, and may facilitate plant-inoculant studies under field conditions.
Carlos Olvera-olvera - One of the best experts on this subject based on the ideXlab platform.
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Modeling and Simulation of Temperature and Relative Humidity Inside a Growth Chamber
Energies, 2019Co-Authors: Germán Díaz-flórez, Jorge D. Mendiola-santibañez, Luis Octavio Solís-sánchez, Domingo Gómez-meléndez, Iván R. Terol-villalobos, Hector Gutiérrez-bañuelos, Ma. Araiza-esquivel, Gustavo Espinoza-garcía, Juan J. García-escalante, Carlos Olvera-olveraAbstract:Modeling and simulation of internal variables such as temperature and relative humidity are relevant for designing future climate control systems. In this paper, a mathematical model is proposed to predict the internal variables temperature and relative humidity (RH) of a Growth Chamber (GCH). Both variables are incorporated in a set of first-order differential equations, considering an energy-mass balance. The results of the model are compared and assessed in terms of the coefficients of determination (R2) and the root mean squared error (RMSE). The R2 and RMSE computed were R2 = 0.96, R2 = 0.94, RMSE = 0.98 °C, and RMSE = 1.08 °C, respectively, for the temperature during two consecutive weeks; and R2 = 0.83, R2 = 0.81, RMSE = 5.45%RH, and RMSE = 5.48%RH, respectively, for the relative humidity during the same period. Thanks to the passive systems used to control internal conditions, the Growth Chamber gives average differences between inside and outside of +0.34 °C for temperature, and +15.7%RH for humidity without any climate control system. Operating, the GCH proposed in this paper produces 3.5 kg of wet hydroponic green forage (HGF) for each kilogram of seed (corn or barley) harvested on average.
Ramsey S. Lewis - One of the best experts on this subject based on the ideXlab platform.
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Growth Chamber Evaluation of a Tobacco ‘Beinhart 1000’ × ‘Hicks’ Mapping Population for Quantitative Trait Loci Affecting Resistance to Multiple Races of Phytophthora nicotianae
Crop Science, 2012Co-Authors: Vijay Vontimitta, Ramsey S. LewisAbstract:Multiple races of Phytophthora nicotianae (van Breda de Haan) cause the black shank disease of tobacco (Nicotiana tabacum L.). Identifi cation of novel alleles affecting resistance and associated DNA markers might help increase the range and level of cultivar resistance. A doubled haploid mapping population generated from a highly resistant × susceptible cross (‘Beinhart 1000’ × ‘Hicks’) was evaluated for resistance after inoculation with either race 0 or race 1 in a Growth Chamber and also genotyped at 206 microsatellite marker loci. Multiple interval mapping identifi ed two major genomic regions affecting resistance to both races. A quantitative trait locus (QTL) on linkage group 8 explained 54.7 and 45.5% of the observed variation for end percent survival after race 0 and race 1 inoculation, respectively. A QTL on linkage group 4 explained a larger proportion (16.8%) of phenotypic variation for race 1 resistance as compared to race 0 resistance (1.8%). In combination with previously reported fi eld data, the study authenticates the role of these two regions on black shank resistance. Correlations of line performance under fi eld and Growth Chamber environments were good, and agreement was excellent at extreme levels of resistance or susceptibility. With appropriate isolate selection, Growth Chamber inoculations may provide a superior alternative to fi eld evaluations for mapping QTL affecting black shank resistance. Identifi ed QTL and associated markers may be useful for increasing levels of resistance to P. nicotianae in tobacco cultivars.
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Growth Chamber evaluation of a tobacco beinhart 1000 hicks mapping population for quantitative trait loci affecting resistance to multiple races of phytophthora nicotianae
Crop Science, 2012Co-Authors: Vijay Vontimitta, Ramsey S. LewisAbstract:Multiple races of Phytophthora nicotianae (van Breda de Haan) cause the black shank disease of tobacco (Nicotiana tabacum L.). Identifi cation of novel alleles affecting resistance and associated DNA markers might help increase the range and level of cultivar resistance. A doubled haploid mapping population generated from a highly resistant × susceptible cross (‘Beinhart 1000’ × ‘Hicks’) was evaluated for resistance after inoculation with either race 0 or race 1 in a Growth Chamber and also genotyped at 206 microsatellite marker loci. Multiple interval mapping identifi ed two major genomic regions affecting resistance to both races. A quantitative trait locus (QTL) on linkage group 8 explained 54.7 and 45.5% of the observed variation for end percent survival after race 0 and race 1 inoculation, respectively. A QTL on linkage group 4 explained a larger proportion (16.8%) of phenotypic variation for race 1 resistance as compared to race 0 resistance (1.8%). In combination with previously reported fi eld data, the study authenticates the role of these two regions on black shank resistance. Correlations of line performance under fi eld and Growth Chamber environments were good, and agreement was excellent at extreme levels of resistance or susceptibility. With appropriate isolate selection, Growth Chamber inoculations may provide a superior alternative to fi eld evaluations for mapping QTL affecting black shank resistance. Identifi ed QTL and associated markers may be useful for increasing levels of resistance to P. nicotianae in tobacco cultivars.
Thomas R. Sinclair - One of the best experts on this subject based on the ideXlab platform.
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Limited-transpiration trait evaluated in Growth Chamber and field for sorghum genotypes
Environmental and Experimental Botany, 2014Co-Authors: Avat Shekoofa, Maria Balota, Thomas R. SinclairAbstract:Abstract Sorghum [Sorghum bicolor (L.) Moench] is commonly grown in water-limited environments throughout the world. Plant traits could be useful allowing for early-season water conservation so that more water is available for use later in the season when drought is most likely to develop. One trait that might result in early-season water conservation is the expression of a limited-transpiration trait defined as a limitation on further increases in transpiration rate (TR) under high vapor pressure deficit (VPD) conditions. The objective of this study was to compare the expression of the limited-TR trait measured for nine sorghum genotypes under both controlled Chamber and field conditions. In the Growth Chamber, plant TR was measured over a range of imposed VPD to provide a direct measure of plant transpiration under high VPD. In the field, stomatal conductance (gs) was measured over the daily cycle, which resulted in a range of ambient VPD. A decrease in gs under high VPD was evidence of the limited-TR trait. This study identified three sorghum genotypes (DKS 36-06, DKS 44-20, and DKS 54-00) that did not show any limitation on water loss at high VPD in either the greenhouse or field. On the other hand, four genotypes (BTX 2752, SC 599, SC 982, and B 35) exhibited the limited-TR trait in the Growth Chamber with breakpoints in response to VPD at values of 2.33 kPa and above. These four genotypes also expressed a breakpoint in gs in response to increasing VPD in the field. Two genotypes (TX ARG 1, TX 436) that differed between the Growth Chamber and field showed consistency in response on close examination of the field results. The overall general correspondence within genotypes between the controlled Chamber and the field in expression or lack of expression of a breakpoint in response to increasing VPD demonstrated the possibility of selecting genotypes for the TRlim trait under differing environmental conditions.