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Traits that confer post-flowering drought tolerance in short duration pigeonpea

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Relation http://oar.icrisat.org/10719/
 
Title Traits that confer post-flowering drought tolerance in short duration pigeonpea
 
Creator Purushothaman, R
Krishnamurthy, L
Hingane, A J
Sameer Kumar, C V
 
Subject Abiotic Stress
Crop Improvement
Pigeonpea
 
Description Pigeonpea (Cajanus cajan) is one of the most important legume
crop, ranking fifth in importance among edible legumes globally.
It is adversely affected by intermittent and terminal droughts.
As grain yield under drought is heavily influenced by genotype
× environment interactions, a trait-based selection had been
considered more beneficial in drought tolerance breeding. The
objective of this study is to identify putative traits that confer
yield advantages under post-flowering drought stress. Fifteen
super early and early genotypes including breeding and germplasm
lines, as a subset of greater number of test genotypes
were field evaluated for pre and post-harvest physiological and
agronomical traits. Significant variation was observed, among
the genotypes, for the traits normalized difference vegetation
index (NDVI) and SPAD chlorophyll meter reading, measured at
different days after sowing at the reproductive phase, shoot biomass
productivity, and yield components. Genotype × drought
treatment interactions were found to be meager, especially in
super early lines. Grain yield under drought was closely associated
with NDVI measured at podfilling stage (r=0.86***), shoot
biomass at maturity, harvest index (HI) and yield components.
Though the genotypic variation in SPAD chlorophyll reading was
large, its correlation with grain yield under drought was not significant.
NDVI, a high throughput measure, was found to be significantly
correlated with the other putative traits such as shoot
biomass (r=0.91***), HI, pod number m-2 and seed number
m-2 and therefore, can be used as a proxy in identifying better
drought tolerant lines in crop improvement for early and super
early pigeonpea.
 
Date 2017-02
 
Type Conference or Workshop Item
PeerReviewed
 
Format application/pdf
 
Language en
 
Rights —
 
Identifier http://oar.icrisat.org/10719/1/256.pdf
Purushothaman, R and Krishnamurthy, L and Hingane, A J and Sameer Kumar, C V (2017) Traits that confer post-flowering drought tolerance in short duration pigeonpea. In: InterDrought-V, February 21-25, 2017, Hyderabad, India.