Delayed water loss and temperature rise in floral buds compared with leaves of Brassica rapa subjected to a transient water stress during reproductive development
Yi Ming Guo A B , Sheng Chen A B , Matthew N. Nelson A B , Wallace Cowling B and Neil C. Turner B C D
+ Author Affiliations
- Author Affiliations
A School of Plant Biology, M084, The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia.
B The UWA Institute of Agriculture, M082, The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia.
C Centre for Legumes in Mediterranean Agriculture, M080, The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia.
D Corresponding author. Email: neil.turner@uwa.edu.au
Functional Plant Biology 40(7) 690-699 https://doi.org/10.1071/FP12335
Submitted: 7 November 2012 Accepted: 22 March 2013 Published: 13 May 2013
Abstract
Leaf canopy temperature has been proposed as a rapid selection tool for drought tolerance among crop genotypes. However, floral bud temperature may be a better indicator of drought tolerance than leaf temperature in grain crops. In this study, we examined whether the floral bud and leaves of Brassica rapa L. had similar stomatal characteristics and showed similar water loss during a drying cycle. We also compared the leaf and bud temperatures when the plants were exposed to a 10-day transient water stress during reproductive development that affected flower development, increased flower abortion, increased pod abortion and reduced yield by an average of 85%. The water loss of detached leaves and floral buds showed that the stomata on the leaves closed before those of the floral buds as the leaf water potential decreased. Consistent with the water loss studies, the temperature of the intact bud showed a delayed increase during the drying process compared with the leaves. This suggested that floral bud temperature could be a useful indicator of the water status of the reproductive organs of B. rapa.
Additional keywords: canopy temperature, cuticular transpiration, drought tolerance, leaf water potential, stomatal characteristics, stomatal transpiration.
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