Thresholds, sensitive stages and genetic variability of finger millet to high temperature stress

Opole, R A and Prasad, P V V and Djanaguiraman, M and Vimala, K and Kirkham, M B and Upadhyaya, H D (2018) Thresholds, sensitive stages and genetic variability of finger millet to high temperature stress. Journal of Agronomy and Crop Science (TSI), 204 (5). pp. 477-492. ISSN 09312250

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Abstract

Finger millet [Eleusine coracana (L.) Gaertn.] is an important coarse cereal crop grown in the arid and semi‐arid regions and often experiences high temperature (HT) stress. The objectives of this research were (i) to quantify effects of season‐long HT stress on physiological and yield traits, (ii) to identify the developmental stages most sensitive to HT stress and (iii) to quantify the genetic variability for HT stress tolerance in finger millet. Research was conducted in controlled environment conditions. HT stress decreased the chlorophyll index, photosystem II activity, grain yield and harvest index. Maximum decrease in number of seeds per panicle and grain yield per plant was observed when stress was imposed during booting, panicle emergence or flowering stages. Maximum genotypic variation was explained by panicle width and number of seeds per panicle at optimum temperature (OT) and grain yield per plant at HT and number of seeds at HT. Based on the stress response and grain yield, tolerant or susceptible genotypes were identified. Finger millet is sensitive to HT stress during reproductive stages, and there was genotypic variability among the finger millet genotypes for number of seeds per panicle and grain yield under HT, which can be exploited to enhance stress tolerance.

Item Type: Article
Divisions: Research Program : Genetic Gains
CRP: UNSPECIFIED
Uncontrolled Keywords: abiotic stress, finger millet, genetic variability, high temperature stress, season-long, sensitive stage
Subjects: Others > Abiotic Stress
Others > Drought Tolerance
Mandate crops > Millets > Finger Millet
Others > Genetics and Genomics
Depositing User: Mr Ramesh K
Date Deposited: 18 Sep 2018 09:33
Last Modified: 20 Sep 2018 05:13
URI: http://oar.icrisat.org/id/eprint/10860
Official URL: http://dx.doi.org/10.1111/jac.12279
Projects: UNSPECIFIED
Funders: USAID
Acknowledgement: This research was supported by the Department of Agronomy, Kansas State University; Feed the Future Innovation Lab for Collaborative Research on Sorghum and Millet; Feed the Future Innovation Lab for Collaborative Research on Sustainable Intensification (Grant no. AID-OAA-L-14-00006) funded by the United States Agency for International Development and the Ogallala Initiative funded by The United States Department of Agriculture–Agricultural Research Service. We thank Dr. Yared Assefa for assistance with statistical analysis. The technical support of Dr. Gautam P. Pradhan is greatly appreciated. This is contribution number 13-313-J from the Kansas Agricultural Experiment Station.
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