Ideal phenotypic characteristics and parental lines for hybrid rice breeding to cope with global dimming

Abstract

The global food crisis has intensified with climate change, and hybrid rice (Oryza sativa L.) is expected to play a crucial role in ensuring world food security. This study analyzed the parental origins and variety characteristics of 930 hybrid rice varieties bred in Sichuan Province, a typical low-light region and one of the main production areas for hybrid rice, from 2002 to 2022. The results indicate that these varieties were hybridized using 329 direct female and 539 direct male parents. Notably, the female parent Peiai 64 and the male parents Yuehesimiao and Fenghuazhan demonstrated a higher probability of breeding rice varieties with high yield and good quality. An ideal panicle type should possess more grains, a lower 1000-grain weight, a higher seed setting percentage, and greater grain density. It is recommended to increase the utilization of excellent parents in Sichuan Province, such as parents with ideal panicle type to improve resistance to climate change, particularly global dimming.

Keywords

Female/male parents / Global dimming / Hybrid rice / Ideal panicle type / Variety characteristics

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Funding

* E-mail addresses: [e-mail] (W. Zhou), [e-mail] (W. Ren).