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AOBPreview originally published online on July 30, 2004
Annals of Botany 2004 94(3):405-411; doi:10.1093/aob/mch157
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Annals of Botany 94/3, © Annals of Botany Company 2004; all rights reserved

Pod Set Related to Photosynthetic Rate and Endogenous ABA in Soybeans Subjected to Different Water Regimes and Exogenous ABA and BA at Early Reproductive Stages

FULAI LIU1,*, CHRISTIAN R. JENSEN1 and MATHIAS N. ANDERSEN2

1 The Royal Veterinary and Agricultural University, Department of Agricultural Sciences, Højbakkegaard Allé 9, DK-2630 Taastrup, Denmark and 2 Danish Institute of Agricultural Sciences, Department of Crop Physiology and Soil Science, Research Centre Foulum, PO Box 50, DK-8830 Tjele, Denmark

* For correspondence. E-mail: fl{at}kvl.dk

Received: 16 April 2004    Returned for revision: 10 May 2004    Accepted: 21 May 2004    Published electronically: 30 July 2004

• Background and Aims The physiological reasons for reduced pod set in soybean (Glycine max) caused by drought during anthesis are not established. The objective of this study was to investigate the involvement of photosynthetic rate (A), pod endogenous abscisic acid (ABA) and exogenously applied ABA and 6-benzylaminopurine (BA) in regulating pod set in soybean during drought.

• Methods Two pot experiments were done in a controlled-environment glasshouse. In expt I, soybeans were either well-watered (WW) or droughted by withholding water from 4 d before to 4 d after anthesis (DAA). In expt II, soybeans were drought-stressed (DS) from –4 to 4 DAA. From –2 to 4 DAA, some of the WW and DS plants were treated with 0·1 mM ABA or 1 mM BA.

• Key Results Drought stress decreased A, but increased pod ABA concentration ([ABA]). Pod set decreased only when A had decreased by 40 %, and pod [ABA] had increased 1·5-fold. Beyond the thresholds, pod set correlated positively with A and negatively with pod [ABA]. Exogenously applied ABA decreased A and pod set in WW plants, whilst it increased A and pod set in DS plants; exogenous BA had opposite effects. In these plants, pod set correlated linearly with A.

• Conclusions Drought-induced decrease in A is significant in inducing pod abortion, probably as a consequence of carbohydrate deprivation. The effects of ABA and BA on pod set may be partially due to their effects on photosynthate supply.

Key words: Glycine max, abscisic acid, 6-benzylaminopurine, drought stress, photosynthatic rate, pod set


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