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Genotypic variation in peanut for transpiration response to vapor pressure deficit

OAR@ICRISAT

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Relation http://oar.icrisat.org/91/
http://dx.doi.org/10.2135/cropsci2009.04.0220
 
Title Genotypic variation in peanut for transpiration response to vapor pressure deficit
 
Creator Jyostna Devi, M
Sinclair, T R
Vadez, V
 
Subject Groundnut
 
Description Conservation of soil water resulting from
decreases in stomata conductance under atmospheric
high vapor pressure defi cit (VPD) conditions
is a possible approach for enhanced
tolerance of water defi cit by crops. Water defi cit
is usually a concern in peanut (Arachis hypogea
L.) since it is frequently grown on sandy soils
with low water-holding capacity. Seventeen peanut
genotypes were studied to determine the
response of their transpiration rates (TR) to VPD.
The results of this study demonstrated variation
among peanut genotypes with nine genotypes
exhibiting a breakpoint in their VPD response
at about 2.2 kPa, above which there was little
or no further increase in TR. Therefore, these
genotypes with a breakpoint have the possibility
of soil water conservation when VPD exceeded
2.2 kPa. The remaining eight genotypes had a linear
response in TR over the whole range of tested
VPD. Also, the 17 genotypes could be separated
into groups with differing rates of increasing TR
at low VPD. The change in TR with increasing
VPD may be important in determining the rate at
which soil water is used under fi eld conditions.
 
Publisher Crop Science Society of America
 
Date 2010
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
Rights —
 
Identifier http://oar.icrisat.org/91/1/CropSci50_1_191-196_2010.pdf
Jyostna Devi, M and Sinclair, T R and Vadez, V (2010) Genotypic variation in peanut for transpiration response to vapor pressure deficit. Crop Science, 50 (1). pp. 191-196.