Journal
JOURNAL OF CEREAL SCIENCE
Volume 70, Issue -, Pages 72-78Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jcs.2016.05.016
Keywords
Drought; Gibberellin; Grain yield and quality; Heat stress
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The present study compared six near-isogenic lines from different backgrounds, varying in Rht (reduced height) alleles for gibberellin (GA) response, for heat and drought tolerance. Various temperature (day/night: 20/12 degrees C to 39/31 degrees C), and irrigation (100% field capacity and no irrigation) treatments were imposed at booting stage. Results depicted a 50% reduction in grain yield at 36.7 degrees C with irrigation and at 31.2 degrees C without irrigation. Number of grains per spike was severely reduced over 26 degrees C for water-stressed plants while irrigated plants did not show any significant reduction up to 34 degrees C. Ear numbers per pot and spikelets per spike were unaffected by irrigation till 33 degrees C. In Mercia, grain nitrogen, sulphur, and Hagberg falling number (HFN) were significantly higher for severe dwarfs (Rht-D1c and Rht-12), however, in Maris Widgeon, rht (tall) recorded higher nitrogen and sulphur concentration while Rht-B1b presented the maximum sedimentation of sodium dodecyl sulphate (SDS). The SDS was higher in Maris Widgeon while HFN were superior in Mercia. Conclusively, the present study demonstrated that heat and drought stresses severely reduced the grain yield while improved grain quality traits. The GA-insensitive semi dwarf Rht-B1b was the most promising genotype for grain yield and HFN under combined drought and heat stresses. (C) 2016 Elsevier Ltd. All rights reserved.
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