Variation in carbon isotope discrimination and its relationship with harvest index in the reference collection of chickpea germplasm

被引:27
|
作者
Krishnamurthy, Lakshmanan [1 ]
Kashiwagi, Junichi [2 ]
Tobita, Satoshi [3 ]
Ito, Osamu [4 ]
Upadhyaya, Hari D. [1 ]
Gowda, Cholenahalli L. L. [1 ]
Gaur, Pooran M. [1 ]
Sheshshayee, Madavalam S. [5 ]
Singh, Sube [1 ]
Vadez, Vincent [1 ]
Varshney, Rajeev K. [1 ]
机构
[1] Int Crops Res Inst Semi Arid Trop, Patancheru 502324, Andhra Pradesh, India
[2] Hokkaido Univ, Grad Sch Agr, Sapporo, Hokkaido 0608589, Japan
[3] Japan Int Res Ctr Agr Sci, Tsukuba, Ibaraki 3058686, Japan
[4] United Nations Univ, Nishi Ku, Yokohama, Kanagawa 2208502, Japan
[5] Univ Agr Sci Bangalore, Bangalore 560065, Karnataka, India
关键词
genetic variability; heritability; stomatal conductance; WATER-USE EFFICIENCY; TRANSPIRATION EFFICIENCY; GRAIN-YIELD; DROUGHT; TRAIT; WHEAT; CONDUCTANCE; GENETICS; PEANUT;
D O I
10.1071/FP13088
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Terminal drought is a major constraint to chickpea productivity. Carbon isotope discrimination (C-13), an integrator of plant behaviour influencing transpiration efficiency (TE), is an important component of yield under drought. The variation in C-13 and its association with yield was assessed in the reference collection of chickpea germplasm. Drought stress reduced shoot biomass by 36-39% and grain yield by 23%. Mean C-13 was low and the range of genetic variation was high under drought stress. Largely, high C-13 accessions were early in flowering (40-50 days), moderate in shoot biomass, high in seed yields and high in harvest index (HI). C-13 was positively correlated with seed yield in both the years under drought stress, only in 2008-09 under optimal irrigation. This positive association was very close with HI. Among the yield components, C-13 was closely associated with pod numbers per unit area and seed size under drought stress. Path coefficients showed no direct association of C-13 with grain yield but an indirect negative association through shoot biomass at maturity and a close positive association through HI. The closest association of HI or shoot biomass was seen in the maturity group of accessions that experienced the optimum terminal drought stress.
引用
收藏
页码:1350 / 1361
页数:12
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