Effect of terminal locations of pods on biomass production and 13C partitioning in a fasciated stem soybean Shakujo |
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Authors: | Yamada Kyosuke Sasakura Aoi Nishiwaki Kiyoshi El-Shemy Hany A Mohapatra Pravat K Nguyen Nguyen T Kurosaki Hideki Kanai Syunsuke Ito Junki Fujita Kounosuke |
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Institution: | (1) Cardiff University, 3D Lab, School of Earth, Ocean and Planetary Sciences, Main Building, Park Place Cardiff, CF10 3YE, UK |
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Abstract: | This study addresses the hypothesis that stagnation of soybean yield on the farm can be improved by selection of a physiological
trait favoring carbon assimilate partitioning to terminally placed pods versus genotypes having axillary pods at close plant
spacing. 13C was fed to source-sink units comprising a leaf, axillary/terminal pods, and petioles at upper and lower positions of the
stem axis in two soybean cultivars, namely Shakujo and Enrei, at different densities of populations. The cultivars differ
significantly in architecture, Shakujo bearing a few hundreds of pods in close succession to one another in a terminally placed
raceme, in contrast to Enrei having axillary racemes. Pod yield per plant was higher in Enrei than in Shakujo at low density,
but Shakujo out-yielded Enrei at close spacing. Population density decreased yield per plant and altered the pattern of assimilate
partitioning significantly within the plants for both varieties. At high density more assimilates moved to the upper parts
at the cost of the lower parts. The terminally placed pods of Shakujo were advantaged to receive assimilates under density
stress. No benefit was accrued to pod filling of Enrei, however, under this condition. |
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Keywords: | Fasciated stem Grain yield Photosynthesis Photosynthate partitioning Population density Soybean Source-sink unit |
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