Quantifying pearl millet response to high temperature stress: thresholds, sensitive stages, genetic variability and relative sensitivity of pollen and pistil

Djanaguiraman, M and Perumal, R and Ciampitti, I A and Gupta, S K and Prasad, P V V (2017) Quantifying pearl millet response to high temperature stress: thresholds, sensitive stages, genetic variability and relative sensitivity of pollen and pistil. Plant, Cell & Environment. pp. 1-15. ISSN 01407791

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Abstract

The objectives were to (1) quantify high temperature (HT) stress impacts at different growth stages (season long, booting to seed-set and booting to maturity) on various yield components; (2) identify the most sensitive stage(s) to short episodes of HT stress during reproductive development; (3) understand the genetic variations for HT stress tolerance based on cardinal temperatures for pollen germination; and (4) determine relative sensitivity of pollen and pistil to HT stress and associated tolerance or susceptible mechanisms in pearl millet. High temperature stress (≥36/26°C) imposed at different stages and durations caused decrease in number of seeds, individual seed weight and seed yield. Two periods (10–12 days and 2–0 days before anthesis) were identified as most sensitive to short episodes of stress, causing maximum decreases in pollen germination percentage and seeds numbers. HT stresses of ≥36/26°C results in floret sterility. Pistils were relatively more sensitive than pollen grains, causing decreased number of seeds and seed yield. HT stress increased the reactive oxygen species contents and decreased the activity of the antioxidant enzymes in both pollen and pistils. Under HT stress, pistils had relatively higher reactive oxygen species and lower antioxidant enzymes activity compared with pollen grains, which explains greater susceptibility of pistils.

Item Type: Article
Divisions: Research Program : Asia
CRP: CGIAR Research Program on Dryland Cereals
Uncontrolled Keywords: High temperature stress; pearl millet; pollen; pistil; reciprocal cross; sensitive stage
Subjects: Mandate crops > Millets > Pearl Millet
Depositing User: Mr Ramesh K
Date Deposited: 18 Apr 2017 10:16
Last Modified: 18 Apr 2017 11:03
URI: http://oar.icrisat.org/id/eprint/9969
Official URL: http://dx.doi.org/10.1111/pce.12931
Projects: UNSPECIFIED
Funders: UNSPECIFIED
Acknowledgement: We thank the USAID for supporting CGIAR and US University linkage grant from International Crop Research Institute for Semi-Arid Tropics; and Feed the Future Innovation Lab for CollaborativeResearch on Sustainable Intensification (Grant no. AID-OAA-L-14-00006) for financial support. We thank Tamil Nadu Agricultural University, India, for permitting Dr M. Djanaguiraman to conduct post-doctoral research at Kansas State University, USA. This is contribution no. 17-197-J fromthe Kansas Agricultural Experiment Station. We declare that we have no conflict of interest.
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