HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Figures Only Full Text Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Sadok, W. Articles by Sinclair, T. R. Search for Related Content PubMed Articles by Sadok, W. Articles by Sinclair, T. R. Agricola Articles by Sadok, W. Articles by Sinclair, T. R. Related Collections Soybean Water Use Crop Physiology & Metabolism

CROP PHYSIOLOGY & METABOLISM

Genetic Variability of Transpiration Response to Vapor Pressure Deficit among Soybean Cultivars

Agronomy Physiology Lab., Univ. of Florida, Box 110965, Gainesville, FL 32611-0965

^* Corresponding author (trsincl{at}ifas.ufl.edu).

Simulation studies have demonstrated that the existence of a limitation on maximum transpiration rate (TR) at high air vapor pressure deficit (VPD) in water-limited conditions could result in significant yield increases. A genotype of soybean [Glycine max (L.) Merr.] (PI 416937) has been identified both with a slow-wilting phenotype in the field and limited TR above a VPD breakpoint (BP) of 2 kPa. Until now, there has been no full documentation of any other soybean genotype that has a restriction on TR at high VPD. The objective of this study was to extend the observations on TR response to VPD to a wider genetic base. Seven soybean genotypes were studied: three cultivars of broad genetic background and four new lines of diverse backgrounds with PI 416937 in their pedigrees. Data collected across a VPD range of 1 to 3.5 kPa for each genotype showed a two-segment TR response to VPD for two cultivars, neither of which was derived from PI 416937. Since three progeny of PI 416937 expressed slow-wilting in the field, these results indicate that the slow-wilting phenotype may also result from a mechanism other than the TR response to VPD. Identification of two new genetic selections with limitation of TR at high VPD indicates there is more than one genetic source for this potentially beneficial trait for water-limited environments.

Abbreviations: BP, breakpoint in the TR response to VPDM • PPFD, photosynthetic photon flux density • TR, transpiration rate • VPD, vapor pressure deficit

This article has been cited by other articles:

				W. Sadok and T. R. Sinclair Transpiration response of 'slow-wilting' and commercial soybean (Glycine max (L.) Merr.) genotypes to three aquaporin inhibitors J. Exp. Bot., March 1, 2010; 61(3): 821 - 829. [Abstract] [Full Text] [PDF]

				M. J. Devi, T. R. Sinclair, and V. Vadez Genotypic Variation in Peanut for Transpiration Response to Vapor Pressure Deficit Crop Sci., December 30, 2009; 50(1): 191 - 196. [Abstract] [Full Text] [PDF]