Differences in the responses of stem diameter and pod thickness to drought stress during the grain filling stage in soybean plants |
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Authors: | Yoshiyuki Ohashi Nobuhiro Nakayama Hirofumi Saneoka Pravat K Mohapatra Kounosuke Fujita |
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Institution: | (1) Graduate School of Biosphere Science, Hiroshima University, Kagamiyama 1-4-4, Higashi-Hiroshima 739-8528, Japan;(2) School of Life Science, Sambalpur University, Jyoti Vihar, Sambalpur, 768019, India |
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Abstract: | This study investigated the factor of the physiological characteristics causing the reduction of yield of soybean plants (Glycine max (L.) Merr.) by drought stress, by monitoring changes in stem diameter and pod thickness, and photosynthetic activity, partitioning
of 13C-labeled photosynthate. Drought stress reduced the whole plant dry weight due to the decrease in leaf and pod dry matter
accumulation; however, this stress did not have a significant effect on stem growth. Leaf photosynthesis was also severely
decreased by drought stress in the early stage of stress treatment as leaf water potential decreased. Imposition of stress
decreased pod thickness, but stem diameter increased. The adverse effect of drought stress on pod thickness was more evident
at night than during the day. The stem diameter also shrank during the day and expanded at night, but the nocturnal increase
in stem diameter during drought stress treatment was greater for stressed plants compared with well-watered controls. Drought
stress significantly promoted 13C partitioning from the fed leaf to other parts of the plant; the stem was the largest beneficiary. Soluble carbohydrates
accumulated in various plant parts under the influence of the stress, but starch concentration declined in all organs except
the stem. These results indicated that stem growth was promoted by drought stress compared to pod growth at the early grain-filling
stage. |
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Keywords: | Drought stress Grain filling Pod thickness Soybean Stem diameter |
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