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Yet, it remains unclear which processes play a key role in limiting the photosynthetic energy utilization of Mg\u2010deficient leaves, and whether the plasticity of <jats:italic>A<\/jats:italic> in acclimation to irradiance could have cross\u2010talk with Mg, hence accelerating or mitigating the photodamage. We investigated the light acclimation responses of rapeseed (<jats:italic>Brassica napus<\/jats:italic>) grown under low\u2010 and adequate\u2010Mg conditions. Magnesium deficiency considerably decreased rapeseed growth and leaf <jats:italic>A<\/jats:italic>, to a greater extent under high than under low light, which is associated with higher level of superoxide anion radical and more severe leaf chlorosis. This difference was mainly attributable to a greater depression in dark reaction under high light, with a higher Rubisco fallover and a more limited mesophyll conductance to CO<jats:sub>2<\/jats:sub> (<jats:italic>g<\/jats:italic><jats:sub>m<\/jats:sub>). Plants grown under high irradiance enhanced the content and activity of Rubisco and <jats:italic>g<\/jats:italic><jats:sub>m<\/jats:sub> to optimally utilize more light energy absorbed. However, Mg deficiency could not fulfill the need to activate the higher level of Rubisco and Rubisco activase in leaves of high\u2010light\u2010grown plants, leading to lower Rubisco activation and carboxylation rate. Additionally, Mg\u2010deficient leaves under high light invested more carbon per leaf area to construct a compact leaf structure with smaller intercellular airspaces, lower surface area of chloroplast exposed to intercellular airspaces, and CO<jats:sub>2<\/jats:sub> diffusion conductance through cytosol. These caused a more severe decrease in within\u2010leaf CO<jats:sub>2<\/jats:sub> diffusion rate and substrate availability. Taken together, plant plasticity helps to improve photosynthetic energy utilization under high light but aggravates the photooxidative damage once the Mg nutrition becomes insufficient.<\/jats:p>","DOI":"10.1111\/tpj.16504","type":"journal-article","created":{"date-parts":[[2023,10,30]],"date-time":"2023-10-30T08:45:08Z","timestamp":1698655508000},"page":"483-497","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":26,"title":["Photosynthetic plasticity aggravates the susceptibility of magnesium\u2010deficient leaf to high light in rapeseed plants: the importance of Rubisco and mesophyll conductance"],"prefix":"10.1111","volume":"117","author":[{"given":"Xiaolei","family":"Ye","sequence":"first","affiliation":[{"name":"Microelement Research Center Huazhong Agricultural University  Wuhan 430070 China"},{"name":"Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtze River), Ministry of Agriculture and Rural 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Engineering and Natural Sciences Sabanci University  Istanbul 34956 Turkey"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jianwei","family":"Lu","sequence":"additional","affiliation":[{"name":"Microelement Research Center Huazhong Agricultural University  Wuhan 430070 China"},{"name":"Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtze River), Ministry of Agriculture and Rural Affairs  Wuhan 430070 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