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Large genetic variation for heat tolerance in the reference collection of chickpea (Cicer arietinum L.) germplasm

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Relation http://oar.icrisat.org/30/
http://dx.doi.org/10.1017/S1479262110000407
 
Title Large genetic variation for heat tolerance
in the reference collection of chickpea
(Cicer arietinum L.) germplasm
 
Creator Krishnamurthy, L
Gaur, P M
Basu, P S
Chaturvedi, S K
Tripathi, S
Vadez, V
Rathore, A
Varshney, R K
Gowda, C L L
 
Subject Chickpea
 
Description Chickpea is the third most important pulse crop worldwide. Changes in cropping system
that necessitate late planting, scope for expansion in rice fallows and the global warming
are pushing chickpeas to relatively warmer growing environment. Such changes demand
identification of varieties resilient to warmer temperature. Therefore, the reference collection
of chickpea germplasm, defined based on molecular characterization of global composite
collection, was screened for high temperature tolerance at two locations in India (Patancheru
and Kanpur) by delayed sowing and synchronizing the reproductive phase of the crop with
the occurrence of higher temperatures ($358C). A heat tolerance index (HTI) was calculated
using a multiple regression approach where grain yield under heat stress is considered as
a function of yield potential and time to 50% flowering. There were large and significant
variations for HTI, phenology, yield and yield components at both the locations. There
were highly significant genotypic effects and equally significant G £ E interactions for all the
traits studied. A cluster analysis of the HTI of the two locations yielded five cluster groups
as stable tolerant (n ¼ 18), tolerant only at Patancheru (n ¼ 34), tolerant only at Kanpur
(n ¼ 23), moderately tolerant (n ¼ 120) and stable sensitive (n ¼ 82). The pod number per
plant and the harvest index explained $60% of the variation in seed yield and $49% of
HTI at Kanpur and $80% of the seed yield and $35% of HTI at Patancheru, indicating that
partitioning as a consequence of poor pod set is the most affected trait under heat stress.
A large number of heat-tolerant genotypes also happened to be drought tolerant.
 
Publisher Cambridge
 
Date 2011
 
Type Article
PeerReviewed
 
Format application/pdf
application/pdf
 
Language en
en
 
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Identifier http://oar.icrisat.org/30/1/lkm2011.pdf
http://oar.icrisat.org/30/2/lkmword.pdf
Krishnamurthy, L and Gaur, P M and Basu, P S and Chaturvedi, S K and Tripathi, S and Vadez, V and Rathore, A and Varshney, R K and Gowda, C L L (2011) Large genetic variation for heat tolerance in the reference collection of chickpea (Cicer arietinum L.) germplasm. Plant Genetic Resources : Characterization and Utilization, 9 (1). pp. 59-69.