Genetic variability in high temperature effects on seed-set in sorghum

Nguyen, C.T. and Singh, V. and van Oosterom, E.J. and et al, . (2013) Genetic variability in high temperature effects on seed-set in sorghum. Functional Plant Biology. A-I.

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Sorghum (Sorghum bicolor (L.) Moench) is grown as a dryland crop in semiarid subtropical and tropical environments where it is often exposed to high temperatures around flowering. Projected climate change is likely to increase the incidence of exposure to high temperature, with potential adverse effects on growth, development and grain yield. The objectives of this study were to explore genetic variability for the effects of high temperature on crop growth and development, in vitro pollen germination and seed-set. Eighteen diverse sorghum genotypes were grown at day?:?night temperatures of 32?:?21°C (optimum temperature, OT) and 38?:?21°C (high temperature, HT during the middle of the day) in controlled environment chambers. HT significantly accelerated development, and reduced plant height and individual leaf size. However, there was no consistent effect on leaf area per plant. HT significantly reduced pollen germination and seed-set percentage of all genotypes; under HT, genotypes differed significantly in pollen viability percentage (17–63%) and seed-set percentage (7–65%). The two traits were strongly and positively associated (R2 = 0.93, n = 36, P < 0.001), suggesting a causal association. The observed genetic variation in pollen and seed-set traits should be able to be exploited through breeding to develop heat-tolerant varieties for future climates.

Item Type: Article
Additional Information: This study was supported by a research grant (GMS-0335) from the Australian Government Department of Agriculture, Forestry and Fisheries.
Uncontrolled Keywords: heat tolerance, pollen germination, seed set percentage.
Author Affiliation: The University of Queensland, School of Agriculture and Food Sciences, Brisbane, Qld 4072, Australia.
Subjects: Crop Improvement
Crop Improvement > Seed Technology
Divisions: Sorghum
Depositing User: Mr Siva Shankar
Date Deposited: 15 Apr 2013 16:31
Last Modified: 15 Apr 2013 16:31
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