TY - JOUR
T1 - A rapid translocation of photoassimilates from source organs maintains grain yield in cowpea subjected to drought stress during grain filling
AU - Egashira, C.
AU - Hashiguchi, Y.
AU - Kurauchi, E.
AU - Tatsumi, Y.
AU - Nakagawa, A. C.S.
AU - Hamaoka, N.
AU - Yuasa, T.
AU - Iwaya-Inoue, M.
AU - Ishibashi, Y.
N1 - Funding Information:
Submitted 22 August 2019, last revision 16 October 2019, accepted 22 October 2019. Abbreviations: HPLC - high-performance liquid chromatography; NSS - nonstructural saccharide; PN - net photosynthetic rate; SWC - soil water content; Acknowledgments: This work was supported by the JSPS KAKENHI Grant Number JP23380013. We are grateful to Dr. Ryoji Matsunaga (JIRCAS) for provision of cowpea seeds, which were bred by IITA. †Present Address: Faculty of Agriculture, Miyazaki University, Miyazaki, Japan ? Corresponding author; fax: (+81) 92 802 4556, e-mail: yushi@agr .kyushu-u.ac.jp
Publisher Copyright:
© 2020, Institute of Experimental Botany, ASCR. All rights reserved.
PY - 2020
Y1 - 2020
N2 - We examined the influence of drought stress during grain filling on grain yield to investigate changes in assimilates in sink and source organs. When plants were subjected to drought stress from the start of grain filling until harvest, the photosynthetic rate rapidly decreased. Grain dry mass during maturation was not significantly different between the control and drought-stressed plants. Under drought stress conditions, starch content in source organs (peduncle, leaf, petiole, stem, and root) was significantly lower than in corresponding organs of control plants; the greatest difference was seen in leaves. Consistent with this observation, α-and β-amylase activities in leaves significantly increased within the first 6 d of drought stress. We conclude that in cowpea subjected to drought stress during grain filling, the grain yield is maintained, despite a dramatic decrease in photosynthetic rate, by translocation of photoassimilates from source organs.
AB - We examined the influence of drought stress during grain filling on grain yield to investigate changes in assimilates in sink and source organs. When plants were subjected to drought stress from the start of grain filling until harvest, the photosynthetic rate rapidly decreased. Grain dry mass during maturation was not significantly different between the control and drought-stressed plants. Under drought stress conditions, starch content in source organs (peduncle, leaf, petiole, stem, and root) was significantly lower than in corresponding organs of control plants; the greatest difference was seen in leaves. Consistent with this observation, α-and β-amylase activities in leaves significantly increased within the first 6 d of drought stress. We conclude that in cowpea subjected to drought stress during grain filling, the grain yield is maintained, despite a dramatic decrease in photosynthetic rate, by translocation of photoassimilates from source organs.
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U2 - 10.32615/bp.2019.129
DO - 10.32615/bp.2019.129
M3 - Article
AN - SCOPUS:85094573258
VL - 64
SP - 529
EP - 534
JO - Biologia Plantarum
JF - Biologia Plantarum
SN - 0006-3134
ER -