Variation in drought-tolerance components and their interrelationships in the core collection of foxtail millet (Setaria italica) germplasm

Krishnamurthy, L and Upadhyaya, H D and Kashiwagi, J and Purushothaman, R and Dwivedi, S L and Vadez, V (2016) Variation in drought-tolerance components and their interrelationships in the core collection of foxtail millet (Setaria italica) germplasm. Crop and Pasture Science, 67 (8). pp. 834-846. ISSN 1836-0947

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Abstract

Foxtail millet (Setaria italica (L.) P.Beauv.) is an ancient cereal cultivated worldwide in arid and marginal lands. It is an ideal crop for the changing climate, with high photosynthetic efficiency. A trait-based selection for drought tolerance is sought for yield stability. The present work had segregated the drought yield as total water use (T), transpiration efficiency (TE) and harvest index (HI) and assessed the importance of these components and their association with drought tolerance. The core collection of foxtail millet germplasm (n = 155) was evaluated in mini-lysimeters under both terminal drought stress (DS) and well-watered (WW) environments. The contribution of T to grain yield under drought was minor but the contribution of TE was positive and of HI negative. Crop duration, T and TE positively influenced, and HI negatively influenced, shoot biomass production. Under drought, the core germplasm accessions varied in shoot biomass, grain yield, HI and T by >3-fold and in TE by 2-fold. Categorisation of the germplasm for TE had differentiated groups of accessions as high TE (n = 17) and low TE (n = 22). Among the three races of foxtail millet, indica was strong for T and TE, and maxima and moharia for HI, with useful exceptions.

Item Type: Article
Divisions: Research Program : Genetic Gains
CRP: CGIAR Research Program on Dryland Cereals
Uncontrolled Keywords: Crop productivity, Genetic variability, G × E interaction, Small millet, Subraces, Water deficit
Subjects: Mandate crops > Millets > Foxtail Millet
Others > Germplasm Collection
Depositing User: Mr Ramesh K
Date Deposited: 07 Jan 2017 10:48
Last Modified: 07 Jan 2017 10:48
URI: http://oar.icrisat.org/id/eprint/9833
Official URL: http://dx.doi.org/10.1071/CP15338
Projects: UNSPECIFIED
Funders: UNSPECIFIED
Acknowledgement: This work was supported by the Bundesministerium für Wirtschaftliche Zusammenarbeit und Entwicklung/Deutsche Gesellschaft für Technische Zusammenarbeit (BMZ/GTZ) project ‘Sustainable conservation and utilisation of genetic resources of two underutilised crops—finger millet and foxtail millet—to enhance productivity, nutrition and income in Africa and Asia’ funded by the Federal Ministry for Economic Cooperation and Development (BMZ), Germany. Expert technical assistance by Mr N. Jangaiah and Mr J. Shankaraiah, (ICRISAT) is also greatly appreciated.
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