Optimising Peanut Growth: Exogenous Calcium Enhances Photosynthesis in Phosphorus-Limited Environments
文献类型： 外文期刊
第一作者： Shi, Qingwen
作者： Shi, Qingwen;Ma, Mingzhu;Liu, Yifei;Sun, Zhiyu;Salam, Shaikh Amjad;Zhang, Siwei;Liu, Huan;Shi, Qingwen;Zhang, Fusuo;Lambers, Hans;Bai, Chunming;Bai, Chunming;Liu, Yifei;Pang, Jiayin;Siddique, Kadambot H. M.;Lambers, Hans;Liu, Yifei;Siddique, Kadambot H. M.;Liu, Yifei;Pang, Jiayin;Lambers, Hans
作者机构：
关键词： calcium; feedback inhibition; peanut; phosphorus; photosynthesis
期刊名称：PLANT CELL AND ENVIRONMENT （ 影响因子：6.3； 五年影响因子：7.7 ）
ISSN： 0140-7791
年卷期： 2025 年
页码：
收录情况： SCI
摘要： The study aimed to enhance peanut growth in phosphorus (P)-limited environments through exogenous calcium (Ca), exploring underlying mechanisms. Foliar application of calcium ions (Ca2+) and calmodulin (CaM) inhibitor (trifluoperazine, TFP) effects were investigated under P deficiency in a climate chamber. Parameters assessed included growth, biomass, nutrient accumulation, leaf expansion, carbohydrate metabolism, chlorophyll concentration, gas exchange, photosynthetic P-use efficiency (PPUE), chlorophyll fluorescence, and P700 redox state. Phosphorus deficiency reduced growth, leaf expansion, chlorophyll concentration, dry matter production, and photosynthetic capacity. Photosynthesis was feedback-limited, evidenced by negative correlations between sucrose concentration and net photosynthetic rate (Pn), and between starch concentration and sucrose phosphate synthase activity under low-P stress (LP). Exogenous Ca2+ application under P deficiency (LP+Ca) stimulated growth, biomass, and carbohydrate export, improving PPUE and photoprotection through enhanced cyclic electron flow and non-photochemical quenching. Conversely, foliar TFP application (LP + TFP) exacerbated the adverse effects of P deficiency on growth and photosynthesis, highlighting Ca2+-CaM's role in mitigating feedback inhibition. Exogenous Ca2+ application alleviated P-deficiency feedback limitations on photosynthesis primarily by enhancing growth/sink demand and protecting photosystems from photoinhibition. Exogenous Ca shows promise for cleaner peanut production in P-limited fields.
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