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

Nguyen, Chuc T., Singh, Vijaya, van Oosterom, Erik J., Chapman, Scott C., Jordan, David R. and Hammer, Graeme L. (2013) Genetic variability in high temperature effects on seed-set in sorghum. Functional Plant Biology, 40 5: 439-448. doi:10.1071/FP12264

Author Nguyen, Chuc T.
Singh, Vijaya
van Oosterom, Erik J.
Chapman, Scott C.
Jordan, David R.
Hammer, Graeme L.
Title Genetic variability in high temperature effects on seed-set in sorghum
Journal name Functional Plant Biology   Check publisher's open access policy
ISSN 1445-4408
Publication date 2013-02-22
Year available 2013
Sub-type Article (original research)
DOI 10.1071/FP12264
Open Access Status
Volume 40
Issue 5
Start page 439
End page 448
Total pages 10
Place of publication Collingwood, VIC, Australia
Publisher CSIRO Publishing
Collection year 2014
Language eng
Formatted abstract
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.
Keyword Heat tolerance
Pollen germination
Seed set percentage
Chilling field temperatures
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Agriculture and Food Sciences
Queensland Alliance for Agriculture and Food Innovation
Official 2014 Collection
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Citation counts: TR Web of Science Citation Count  Cited 10 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 13 times in Scopus Article | Citations
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