Phosphorus-fertilisation has differential effects on leaf growth and photosynthetic capacity of Arachis hypogaea L.

文献类型： 外文期刊

第一作者： Shi, Qingwen

作者： Shi, Qingwen;Song, Qiaobo;Wu, Di;Dong, Qiping;Cheng, Xin;Liu, Yifei;Pang, Jiayin;Wang, Feng;Zheng, Junlin;Liu, Yifei;Lambers, Hans;Pang, Jiayin;Zheng, Junlin;Liu, Yifei;Yong, Jean Wan Hong;Pereira, Caio Guilherme;Wang, Feng;Liu, Yifei;Lambers, Hans;Yong, Jean Wan Hong;Bai, Chunming

作者机构：

关键词： Peanut; Phosphorus; Suboptimal; Supraoptimal; Photosynthesis

期刊名称：PLANT AND SOIL （ 影响因子：4.192； 五年影响因子：4.712 ）

ISSN： 0032-079X

年卷期： 2020 年 447 卷 1-2 期

页码：

收录情况： SCI

摘要： Aims The objectives of this study were to assess how Arachis hypogaea L. (peanut or groundnut) responds to different P supplies in terms of growth and photosynthesis, and to determine the optimum P supply and differential P stress thresholds. Methods We investigated biomass production, leaf expansion, photosynthetic parameters, relative chlorophyll concentration, P700 parameters and chlorophyll fluorescence in a climate-controlled chamber at different P supplies (0.1, 0.5, 1, 1.5, 2 mM). Results Both deficient and excessive exogenous P supplies significantly reduced leaf growth, relative chlorophyll concentration and dry matter production in two high-yielding peanut cultivars. The optimum P range was 0.8-1.1 mM for peanut seedlings. Through principal component analysis (PCA) and data fitting, we found that the trade-off of the normalised actual quantum yield [Y(II)] and non-regulatory quantum yield [Y(NO)] in photosystem II (PSII) under light is one of the best proxies to determine the suboptimal, supraoptimal, deficient and toxic P supplies, because they are the two key factors with major positive and negative effects of PC1, accounting for 75.5% of the variability. The suboptimal P range was 0.41-0.8 mM and the supraoptimal P range was 1.1-1.72 mM. The suboptimal P supplies corresponded with a leaf P concentration range of 4.8-8.1 mg P g(-1) DW, while the supraoptimal P supplies corresponded with a leaf P concentration range of 9.9-12.2 mg P g(-1) DW. Conclusions Both deficient and toxic P levels severely inhibited leaf growth and photosynthesis of peanut, and these unfavourable conditions were associated with significant reduction of biomass and photosynthesis, and photodamage extending beyond PSII. The trade-off of the normalised Y(II) and Y(NO) is a useful benchmark to demarcate deficient, suboptimal, supraoptimal and toxic P-fertilisations levels in A. hypogaea.

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