Nitrogen-driven changes in leaf anatomy affect the coupling between leaf mass per area and photosynthesis.

IF 5.6 2区 生物学 Q1 PLANT SCIENCES
Wenshi Hu, Shanshan Zhang, Wei Huang, Haibin Chang, Yinshui Li, Chiming Gu, Jing Dai, Lu Yang, Xing Liao, Lu Qin
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Abstract

Leaf mass per area (LMA) and photosynthetic rate (A) explain fast-slow growth strategies in worldwide leaf economic spectrum. Nitrogen (N) promotes A and rapid growth; while LMA response to N supply in a genotype specific manner. Structural traits affect the relationship between LMA and A, and we hypothesized that N supply would affect structural traits and thus the coupling between LMA and A. We tested this hypothesis by measuring A, LMA, anatomical traits and N allocation to various leaf components in 9 Brassica napus cultivars under two N supply levels. Mesophyll cell density (ρcell) and palisade tissue thickness (Tp) predominantly influence the variability in LMA. Enhanced Tp increased LMA, chloroplast surface area exposed to intercellular airspace, and N allocation into Rubisco (Nrub), thereby positively affecting mesophyll conductance (gm) and A. Conversely, ρcell promoted LMA but negatively affect Nrub under N deficiency. Enhanced LMA promoted N allocation to cell wall (Ncw), causing decreased Nrub fraction, and consequently A. This negative effect was relieved by the positive effect of Tp on A, which coupled the variation of LMA and A. The plasticity of Tp and ρcell regulating gm and trade-off between Nrub and Ncw provides insights for simultaneous increases in LMA and A to promote rapid growth and resistance.

氮驱动的叶片解剖结构变化影响叶面积质量与光合作用之间的耦合。
叶面积质量(LMA)和光合速率(A)解释了世界范围内叶片经济谱的快慢生长策略。氮(N)促进A和快速生长;而LMA则以基因型特异性的方式对氮供应作出反应。结构性状影响LMA与A之间的关系,我们假设氮素供给会影响结构性状,从而影响LMA与A之间的耦合关系。我们通过测量9个甘蓝型油菜品种在2个氮素供给水平下的A、LMA、解剖性状和不同叶片组分的氮素分配来验证这一假设。叶肉细胞密度(ρcell)和栅栏组织厚度(Tp)是影响LMA变异的主要因素。Tp的增强增加了LMA、叶绿体暴露于胞间空间的表面积和氮分配到Rubisco (Nrub)的数量,从而对叶肉电导(gm)和a产生正影响。相反,在缺氮条件下,ρcell促进了LMA,但对Nrub产生负影响。增强的LMA促进了N分配到细胞壁(Ncw),导致Nrub组分减少,从而导致A含量降低。这种负面影响被Tp对A的正作用所缓解,而正作用耦合了LMA和A的变化。Tp和ρ细胞调节gm的可塑性以及Nrub和Ncw之间的权衡为LMA和A同时增加以促进快速生长和抗性提供了新的视角。
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来源期刊
Journal of Experimental Botany
Journal of Experimental Botany 生物-植物科学
CiteScore
12.30
自引率
4.30%
发文量
450
审稿时长
1.9 months
期刊介绍: The Journal of Experimental Botany publishes high-quality primary research and review papers in the plant sciences. These papers cover a range of disciplines from molecular and cellular physiology and biochemistry through whole plant physiology to community physiology. Full-length primary papers should contribute to our understanding of how plants develop and function, and should provide new insights into biological processes. The journal will not publish purely descriptive papers or papers that report a well-known process in a species in which the process has not been identified previously. Articles should be concise and generally limited to 10 printed pages.
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