Lower-Than-Expected Floret Sterility of Rice under Extremely Hot Conditions in a Flood-Irrigated Field in New South Wales, Australia

Plant Production Science

John Angus¹  Tsutomu Matsui²  Hiroshi Nakagawa³  Mayumi Yoshimoto⁴  Toshihiro Hasegawa⁴  Kazuhiro Kobayasi⁵  Russell Reinke⁶ 

[1] CSIRO Black Mountain Laboratories;Gifu University;National Agricultural Research Center;National Institute for Agro-Environmental Sciences;Shimane University;Yanco Agricultural Institute;

关键词: High temperature;    Pollen germination;    Pollination;    Rice;    Sterility;    Transpirational cooling;   

DOI  :  10.1626/pps.17.245

来源: DOAJ

【 摘 要 】

Rice florets are susceptible to high-temperature damage at anthesis, but rice production remains stable in the Riverina region of Australia even when the air temperature during flowering exceeds 40°C. To identify the mechanism that supports rice production under these conditions, we examined sterility and pollination in relation to microclimate and panicle temperature in an extremely hot paddy field in the Riverina region of New South Wales. In windy > 40°C weather, the panicle temperature was > 38°C at the windward edge of the crop but around 35°C inside the crop, probably because of strong transpirational cooling due to the extremely dry wind (15% RH). Pollen from the windward edge of the crop showed extremely poor germination, yet that from inside the crop showed sufficient germination for fertilization. Moreover, sterility inside the crop was significantly lower than that at windward edge. We concluded that the wind with large vapor pressure deficit enabled stable rice production under the extreme heat during flowering.

【 授权许可】

Unknown