Yield response of high-yielding rice cultivar Oonari to different environmental conditions

ABSTRACT

A new rice (Oryza sativa L.) cultivar, ‘Oonari’, was developed to reduce the shattering habit of the high-yielding cultivar ‘Takanari’. To evaluate the effects of environment on its yield and related traits, Oonari and Takanari were grown in multiple environmental conditions at three locations in Japan. The whole and filled brown rice yields of Oonari were around 1000 g m⁻², similar to those of Takanari. But the panicle number m⁻² of Oonari was slightly but significantly higher than that of Takanari and the spikelet number per panicle was slightly but significantly lower. With respect to the effect of environment on yield of Oonari, cumulative radiation during 40 days after heading was positively related to whole brown rice yield of Oonari. Yield tended to be higher under increased atmospheric CO₂ concentration than under ambient. Oonari was confirmed to exhibit high yield in various environmental conditions.

Graphical Abstract

KEYWORDS:

• CO₂
• climate change
• FACE
• Oonari
• rice (Oryza sativa L.)
• weather condition
• yield

Acknowledgments

We express our gratitude to the staff of the research support section at NARO and the technical support staff of our laboratories. We thank Hirofumi Nakamura, of Taiyo Keiki, for his support in the FACE experiment.

Disclosure statement

No potential conflict of interest was reported by the authors.

Supplementary Materials:

Supplemental Materials data for this article can be accessed here.