Popular Rice (Oryza sativa L.) Cultivars Show Contrasting Responses to Heat Stress at Gametogenesis and Anthesis

• DOI: 10.2135/cropsci2014.01.0054
• Publication Date: 2015-02-03T14:09:10Z
• Authors: W. Shi; T. Ishimaru; R. B. Gannaban; W. Oane; S. V. K. Jagadish
• Keywords: Anthesis; Panicle

ABSTRACT Studies on heat tolerance in rice ( Oryza sativa L.) have focused a range of accessions that are currently not grown or cultivated small localized geographic regions, while popular cultivars occupying millions hectares been tested for their response to stress. Hence, 18 across tropical and subtropical regions were subjected 38°C 6 h stress at anthesis five selected contrasting entries exposed six consecutive days (6 each day) coinciding with both gametogenesis anthesis. Among the entries, Ciherang was most tolerant, after d anthesis, whereas Moroberekan KDML‐105 susceptible. Using quick easy phenotyping protocol by considering all sterile spikelets target panicles, crucial physiological window “spikelets exserted anthers but no ovule enlargement” identified as sensitive stage exposure critical reproductive stages. Geographic origin varieties clearly related degree susceptibility because conditions observed from region. Our findings complement other ongoing efforts using heat‐tolerant landraces wild donors further increase sustain global production under future warmer climate.