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Timing of sampling for the canopy temperature depression can be critical for the best differentiation of drought tolerance in chickpea

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Relation http://oar.icrisat.org/8628/
 
Title Timing of sampling for the canopy temperature depression can be critical for the best differentiation of drought tolerance in chickpea
 
Creator Purushothaman, R
Krishnamurthy, L
 
Subject Chickpea
Climate change
 
Description Maintenance of water supply during grain filling is critical
for the drought adaptation of chickpea and therefore
measurements of canopy temperature depression (CTD)
could be used as a proxy for water extraction. However
the conditions and timing of such measurements are
not yet clear. CTD has been recognized as a highly
dependable trait for estimating the drought tolerance in
chickpea. This study was aimed at identifying an optimal
CTD sampling time under drought stress and an optimally
irrigated condition as well. In addition, it also involved
using 12 selected germplasm accessions to understand
the association of CTD, with the previously established
drought response and early rooting characteristics.
The growth stage involved identifying a sample which
included (i)combination of high genetic variation, (ii) best
differentiation of accessions by CTD, (iii) large number
of accessions exhibiting highly negative CTDs, (iv) high
heritability of CTD and (v) the best association of CTD
with grain yield. Also, the growth stage was decided to
be the critical time of sampling for canopy temperature
measurements. Under drought stress, the critical timing
was 66 days after sowing (DAS) in 2009-10 and 70
DAS in 2010-11. Under optimally irrigated condition,
the critical timing of sampling was 70 DAS in 2009-10
and 63 DAS in 2010-11. But the changes that occurred
in the indicative parameters were marginal till 82 DAS,
denoting that, in an optimally irrigated environment,
a longer window of growth stages was required to be
permitted for sampling. The drought tolerance and local
adaptation of chickpea accessions were explained by the
CTD under drought stress as well as under optimally
irrigated condition.
 
Publisher ICRISAT
 
Date 2014
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
Rights —
 
Identifier http://oar.icrisat.org/8628/1/SAT%20eJournal_1_1_1-9_2014.pdf
Purushothaman, R and Krishnamurthy, L (2014) Timing of sampling for the canopy temperature depression can be critical for the best differentiation of drought tolerance in chickpea. SAT eJournal, 1 (1). pp. 1-9.