数字农科院2.0

Nitrogen regulates pollen tube elongation under low-light stress during anthesis to prevent spikelet abortion in rice

文献类型： 外文期刊

作者： Yichang Zhong;Hubo Li;Feifei Li;Guanfu Fu;Qiao Deng;Dali Zeng;Linzhou Huang

作者机构：

关键词： Energy homeostasis;Low-light;Nitrogen;Pollen tube;Rice

期刊名称： Plant Growth Regulation

ISSN： 0167-6903

年卷期： 2025 年 105 卷 1 期

页码：

收录情况： SCIE（2025版）

摘要： Low-light has emerged as a primary environmental factor limiting rice production, yet there is currently limited research on relevant regulatory measures. In this study, a low-light-intolerant RGA1 gene mutant d1, and its wild type (Zhonghua 11, WT), along with RGA1 overexpression line OE-1, were used to investigate the effects of nitrogen levels on rice yield formation under low-light condition during anthesis, using field shading treatment. Our results showed that low-light significantly decreased spikelet fertility, with inhibited pollen tube elongation leading to spikelet abortion. We found that RGA1 could promote pollen tube elongation resulted from low-light stress at low nitrogen (60 kg N·ha− 1, LN) and medium nitrogen (160 kg N·ha− 1, MN) levels. Under low-light condition, the MN treatment notably increased the ratio of pollen tube entering into the ovule and spikelet fertility compared to the LN treatment, while the high nitrogen treatment (260 kg N·ha− 1, HN) decreased spikelet fertility and yield in WT and OE-1 plants. For the d1 mutant, except for the LN treatment, other nitrogen treatments had minimal effects on spikelet fertility and yield. Furthermore, compared to the LN treatment, the activities of invertase and sucrose synthase, as well as the content of ATP, and ATPase in the spikelets of WT and OE-1 significantly increased when treated with MN under low-light condition. In conclusion, moderately increasing nitrogen levels can enhance sucrose metabolism, maintain energy balance thus alleviating inhibition of pollen tube elongation resulted from low-light stress and improving spikelet fertility.

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