Increasing leaf export and grain import capacities in maize plants under water stress

Functional Plant Biology : FPB
Jacques Trouverie, Jean-Louis Prioul

Abstract

The export rate and the carbohydrate concentration were measured in maize plants submitted to water deprivation either at the fourth leaf stage or at pollination. Export rate was evaluated by a short pulse of labelling with 14CO2 followed by a 10-h chase. In stressed plants, 14C fixation was strongly reduced. When radioactivity was expressed relative to the initial value, the time course of label export from the labelled zone showed a faster decline in stressed plants than in well-watered plants. This was observed both under mild stress (fourth leaf stage) and severe stress (pollination stage). Another consequence of drought stress was an increase in fourth leaf vacuolar invertase activity and an increase in hexoses, which accumulated to the same content as sucrose. This occurred without a significant decrease in starch. At pollination stage, despite a large decrease in absolute quantity of 14C entering kernels, the proportion of leaf 14C export recovered in the kernel was not modified after a 4-d water deprivation, i.e. at day 0 after pollination (0 DAP), and was multiplied by a factor of 2-3 at 12 DAP. The major conclusion arising from these data appears to be an improvement of both leaf export and kernel import efficiency un...Continue Reading

References

Jul 10, 2002·Annals of Botany·M M ChavesC Pinheiro
Feb 1, 1995·Plant Physiology·C. ZinselmeierR. J. Jones
Aug 20, 2003·Journal of Experimental Botany·Jacques TrouverieJean-Louis Prioul
Aug 1, 2004·Functional Plant Biology : FPB·Josefina BotaHipólito Medrano

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Citations

Jul 23, 2008·Plant, Cell & Environment·Sonia M Cuellar-OrtizAlejandra A Covarrubias
Oct 6, 2017·Journal of Experimental Botany·Gregory J MacNeillMichael J Emes
Aug 24, 2019·International Journal of Molecular Sciences·Lin ChenHongbo Zhao

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