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Assessment of ICCV 2 × JG 62 chickpea progenies shows sensitivity of reproduction to salt stress and reveals QTLs for seed yield and yield components

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Relation http://oar.icrisat.org/58/
http://dx.doi.org/10.1007/s11032-011-9594-6
 
Title Assessment of ICCV 2 × JG 62 chickpea progenies shows sensitivity of reproduction to salt stress and reveals QTLs for seed yield and yield
components
 
Creator Vadez, V
Krishnamurthy, L
Thudi, M
Anuradha, C
Colmer, T D
Turner, N C
Siddique, K H M
Gaur, P M
Varshney, R K
 
Subject Chickpea
 
Description Salinity is a complex abiotic stress and understanding the physiological and genetic basis
of salinity tolerance is a prerequisite for improving existing crop cultivars. Experiments
were undertaken using 126 recombinant inbred lines from a cross between JG 62
(tolerant) and ICCV 2 (sensitive) to characterize traits related to seed yield differences
under saline conditions and to map quantitative trait loci (QTL). The population
segregated for flowering time and entries were separated into ‘early’ and ‘late’ phenology
groups to undertake the analysis. In both groups seed yield varied under salinity, with
4
seed number being the most closely related trait to yield. In contrast, seed yield was not
related to 100-seed weight or flowering time. Shoot dry weight was positively correlated
with seed yield in the early entries only, but had no significant relationship with seed
number. The higher sensitivity to salinity of the early entries was related both to a smaller
biomass and lesser seed number under saline conditions. A QTL for seed yield under
saline conditions was found in linkage group 3 in the late group, and a cluster of QTLs
for seed yield components in linkage group 6, including a QTL for seed number which
explained 37% of the variation. In contrast, no QTL for seed yield was found in the early
group, but a QTL for seed number under saline conditions was found. These data indicate
that salinity tolerance traits are linked to the degree of earliness in chickpea. Tolerance is
determined by the success of reproductive sites in both early and late entries, which
relates in part to constitutive traits, and by the capacity of maintaining growth in earlyflowering
lines only. This is the first report of QTLs for seed yield and seed number in
chickpea exposed to salinity.
 
Publisher Springer Netherlands
 
Date 2012
 
Type Article
PeerReviewed
 
Format application/pdf
application/pdf
 
Language en
en
 
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Identifier http://oar.icrisat.org/58/1/Mol_Breed_30_9-21_2012.pdf
http://oar.icrisat.org/58/7/Vadezet-al%20-MolBreeding_Postprint_2012l.pdf
Vadez, V and Krishnamurthy, L and Thudi, M and Anuradha, C and Colmer, T D and Turner, N C and Siddique, K H M and Gaur, P M and Varshney, R K (2012) Assessment of ICCV 2 × JG 62 chickpea progenies shows sensitivity of reproduction to salt stress and reveals QTLs for seed yield and yield components. Molecular Breeding, 30 (1). pp. 9-21. ISSN 1572-9788