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Individual and combined effects of transient drought and heat stress on carbon assimilation and seed filling in chickpea

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Relation http://oar.icrisat.org/7923/
http://dx.doi.org/10.1071/FP13340
 
Title Individual and combined effects of transient drought and heat stress on carbon assimilation and seed filling in chickpea
 
Creator Nayyar, H
Awasthi, R
Kaushal, N
Vadez, V
Turner, N
Berger, J
Siddique, K
 
Subject Chickpea
Plant Physiology
 
Description High temperatures and decreased rainfall are detrimental to yield in chickpea (Cicer arietinum L.), particularly during grain filling. This study aimed to (i) assess the individual and combined effects of drought and heat stress on biochemical seed-filling processes, (ii) determine genotypic differences in heat and drought tolerance, and (iii) determine any cross-tolerance. Plants were grown outdoors in the normal growing season when temperatures during seed filling were 32-20°C; heat stress). Half of the pots were kept adequately watered throughout, but water was withheld from the others from the initiation of seed filling until the relative leaf water content reached 50% of the irrigated plants (drought stress); all plants were rewatered thereafter until seed maturit. Water was withheld for 13 days (normal sowing) and 7 days (late sowing), so soil moisture decreased by 54–57%. Tests on leaves and seeds were performed after the stress. Individual and combined stress damaged membranes, and decreased cellular oxidising ability, stomatal conductance, PSII function and leaf chlorophyll content; damage was greater under combined stress. Leaf Rubisco activity increased with heat stress, decreased with drought stress and decreased severely with combined stress. Sucrose and starch concentrations decreased in all seeds through reductions in biosynthetic enzymes; reductions were greater under combined stress. These effects were more severe in heat- and drought-sensitive genotypes compared with drought-tolerant genotypes. Drought stress had a greater effect than heat stress on yield and the biochemical seed-filling mechanisms. Drought- and heat-tolerant genotypes showed partial cross-tolerance
 
Publisher CSIRO Publishing
 
Date 2014
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
Rights —
 
Identifier http://oar.icrisat.org/7923/1/FPB_41_11_1148-1167_2014.pdf
Nayyar, H and Awasthi, R and Kaushal, N and Vadez, V and Turner, N and Berger, J and Siddique, K (2014) Individual and combined effects of transient drought and heat stress on carbon assimilation and seed filling in chickpea. Functional Plant Biology, 41 (11). pp. 1148-1167. ISSN 1445-4408