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Research Interests: Agronomy, Biology, Growth, Yield, Soybean, and 6 moreGenotype, Plant production, Glycine, Glycine max, Dry Matter, and Growth and Yield
Previous studies on plant responses to elevated atmospheric CO2 concentration [CO2] found the occurrence of elevated [CO2]–induced photosynthetic acclimation. Soybean cultivar Enrei was grown in pots and was subjected to either ambient... more
Previous studies on plant responses to elevated atmospheric CO2 concentration [CO2] found the occurrence of elevated [CO2]–induced photosynthetic acclimation. Soybean cultivar Enrei was grown in pots and was subjected to either ambient [CO2] (ca. 380 μmol mol -1 ) or elevated [CO2] (ca. 580 μmol mol -1 ) regime. The half of the plants were transferred to the other [CO2] regime at flowering. Under elevated [CO2], photosynthetic rate was markedly enhanced at the early growth stage, whereas it was decreased at the later growth stage on both transferred and untransferred plants, indicating that the acclimation occurred at the later growth stage of the plants regardless of the transfer. Electron transport rate (ETR) curve of the plants under elevated [CO2] regime became plateau at about 300 μmol mol -1 intercellular [CO2] at the later growth stage (35 days after transfer (DAT)), which was less than the plateaued value under ambient [CO2] regime (320 μmol mol -1 ), indicating that the acc...
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This eBook is a collection of articles from a Frontiers Research Topic. Frontiers Research Topics are very popular trademarks of the Frontiers Journals Series: they are collections of at least ten articles, all centered on a particular... more
This eBook is a collection of articles from a Frontiers Research Topic. Frontiers Research Topics are very popular trademarks of the Frontiers Journals Series: they are collections of at least ten articles, all centered on a particular subject. With their unique mix of varied contributions from Original Research to Review Articles, Frontiers Research Topics unify the most influential researchers, the latest key findings and historical advances in a hot research area! Find out more on how to host your own Frontiers Research Topic or contribute to one as an author by contacting the Frontiers Editorial Office: frontiersin.org/about/contac
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Abstract Soybean ( Glycine max (L.) Merr.) is vulnerable to waterlogging, which threatens soybean productivity in humid regions of Asia. Waterlogging can happen during any growth stage of soybean, but flooding stress before, at or after... more
Abstract Soybean ( Glycine max (L.) Merr.) is vulnerable to waterlogging, which threatens soybean productivity in humid regions of Asia. Waterlogging can happen during any growth stage of soybean, but flooding stress before, at or after germination causes severe seed and seedling damage, resulting in substantial reduction of grain yield at maturity. Under waterlogged conditions, seeds imbibe rapidly, destroying seed tissues due to abrupt swelling of the cells. Anatomical observations during water absorption of seeds revealed that the aleurone layer blocks abrupt water penetration into the embryo regardless of genotype. Based on these observations, genetic analyses of waterlogging-tolerant genotypes are currently in progress and attempts to incorporate the genes responsible for such tolerance are being made. Among cultural measures to alleviate waterlogging-induced damage during germination, pre-hydrating seeds prior to sowing proved to be most effective. After emergence, waterlogging impairs root function, primarily due to hypoxia, and thereby the capacity for nutrient uptake and growth. Molecular characterization of enzymes expressed in growing plants subjected to waterlogging treatment has identified several genes involved in anaerobic respiration. In addition, some soybean cultivars were found to form aerenchyma, which transports oxygen from aboveground tissues to the root system, in response to waterlogging. These phenomena should be exploited for breeding waterlogging-tolerant cultivars. Cultural methods including partial tillage and adjustment of the water table also effectively mitigate damage caused by waterlogging. Integration of these approaches should lead to stable soybean production in humid agricultural areas of Asia.
Research Interests: Agronomy, Biology, Field Crops, Cultivar, Water Table, and 3 moreSoil sciences, Germination, and Seedling
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References Genetic improvement in water uptake ability and/or water use efficiency (WUE) of rice cultivars is one option to enhance productivity under water-limited conditions. We examined the genotypic variation in biomass production... more
References Genetic improvement in water uptake ability and/or water use efficiency (WUE) of rice cultivars is one option to enhance productivity under water-limited conditions. We examined the genotypic variation in biomass production among 70 rice cultivars (69 cultivars of NIAS global rice core collection and Azucena) under different soil moisture conditions, and to identify whether water uptake ability or WUE is responsible for the variation, if any. Two-week-old seedlings were transplanted into pots and grown for three weeks in an environmentally-regulated growth chamber under three soil moisture regimes: flooded (−0.02 MPa soil water potential) and two unflooded (−0.10 and −0.52 MPa) conditions. Substantial genotypic variations in total dry weight (TDW) were observed under all three regimes. Among all the cultivars tested, TDW was significantly correlated with water uptake ability, but not with WUE. However, several cultivars exhibited comparably higher WUE while showing superior biomass production under the −0.52 MPa regime. The amount of water uptake was significantly correlated with root dry weight among cultivars regardless of moisture regimes, while substantial genotypic difference in the amount of water uptake per unit root dry weight was observed. These results indicate that a marked genotypic difference exists in biomass production at the early vegetative growth under water-deficient conditions, and that this difference appears to be ascribed primarily to greater water uptake capacity, and additionally to higher WUE in drought-tolerant cultivars.