数字农科院2.0

Nitrate availability regulated leaf anatomical structure to prevent ammonium toxicity on photosynthetic rate of Brassica napus

文献类型： 外文期刊

作者： Wenshi Hu;Shanshan Zhang;Jing Dai;Chiming Gu;Lu Yang;Yinshui Li;Lu Qin

作者机构：

关键词： Ammonium;Anatomical traits;Mesophyll conductance;Nitrate;Photosynthesis

期刊名称： Environmental and Experimental Botany

ISSN： 0098-8472

年卷期： 2025 年 237 卷

页码：

收录情况： SCIE（2025版）

摘要： Ammonium (NH4+-N) is the predominant form of nitrogen (N) fertilizer, but poses a risk of NH4+ toxicity, adversely affecting plant growth. Photosynthesis, which is closely linked to biomass and yield, is inhibited by NH4+ toxicity, but this effect is alleviated with increasing supplied nitrate (NO3−-N) fraction. To understand the mechanism behind NO₃⁻-N's alleviation of NH₄⁺-N inhibition on photosynthesis, limiting factors for photosynthetic rate (A) and anatomical characteristics of Brassica napus, an essential oil crop that heavily relies on N fertilizer, were measured. Results revealed that the inhibition of NH4+-N toxicity on A and growth was aggravated under NO3−-N deprivation. When the proportion of NO3−-N was lower than that of NH₄⁺-N, the decrease of A was dominated by mesophyll conductance (gm), with its reduction strongly correlated with increased distance between two neighbouring chloroplasts (Dchl-chl) and decreased chloroplast surface area exposed to intercellular airspace per unit leaf area (Sc). NO3−-N supply promoted volume fraction of intercellular air space (fias) and mesophyll surface area exposed to intercellular airspace per unit leaf area (Sm), furtherly enhancing Sc and facilitating higher gm. Additionally, Dchl-chl, fias, and Sm were more closely related to leaf NO3−-N concentration than to NH4+-N. Thus, NO3−-N plays a crucial role in mitigating NH₄⁺-N toxicity on A by regulating leaf mesophyll arrangement and morphology. Increasing the proportion of NO3−-N in fertilizers provides a strategy for crops at the risk of soil NH4+-N toxicity to maintain high A, furtherly promoting yield and N use efficiency.

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