Journal article
Variation in carbon isotope discrimination and its relationship with harvest index in the reference collection of chickpea germplasm
Functional Plant Biology, Vol.40(12), pp.1350-1361
2013
Abstract
Terminal drought is a major constraint to chickpea productivity. Carbon isotope discrimination (Δ13C), an integrator of plant behaviour influencing transpiration efficiency (TE), is an important component of yield under drought. The variation in Δ13C 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 Δ13C was low and the range of genetic variation was high under drought stress. Largely, high Δ13C accessions were early in flowering (40–50 days), moderate in shoot biomass, high in seed yields and high in harvest index (HI). Δ13C 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, Δ13C was closely associated with pod numbers per unit area and seed size under drought stress. Path coefficients showed no direct association of Δ13C 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.
Details
- Title
- Variation in carbon isotope discrimination and its relationship with harvest index in the reference collection of chickpea germplasm
- Authors/Creators
- L. Krishnamurthy (Author/Creator) - International Crops Research Institute for the Semi-Arid TropicsJ. Kashiwagi (Author/Creator) - Hokkaido UniversityS. Tobita (Author/Creator) - Japan International Research Center for Agricultural SciencesO. Ito (Author/Creator) - United Nations University, 1-1-1 Minato Mirai, Nishi-ku, Yokohama 220-8502, Japan.H.D. Upadhyaya (Author/Creator) - International Crops Research Institute for the Semi-Arid TropicsC.L.L. Gowda (Author/Creator) - International Crops Research Institute for the Semi-Arid TropicsP.M. Gaur (Author/Creator) - International Crops Research Institute for the Semi-Arid TropicsM.S. Sheshshayee (Author/Creator) - University of Agricultural Sciences, BangaloreS. Singh (Author/Creator) - International Crops Research Institute for the Semi-Arid TropicsV. Vadez (Author/Creator) - International Crops Research Institute for the Semi-Arid TropicsR.K. Varshney (Author/Creator) - International Crops Research Institute for the Semi-Arid Tropics
- Publication Details
- Functional Plant Biology, Vol.40(12), pp.1350-1361
- Publisher
- CSIRO Publishing
- Identifiers
- 991005545442207891
- Copyright
- © 2013 CSIRO.
- Murdoch Affiliation
- Murdoch University
- Language
- English
- Resource Type
- Journal article
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- Domestic collaboration
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- Citation topics
- 3 Agriculture, Environment & Ecology
- 3.4 Crop Science
- 3.4.424 Crop Yield Optimization
- Web Of Science research areas
- Plant Sciences
- ESI research areas
- Plant & Animal Science