The intraspecific variations of leaf structure and anatomy in rice leaves and their impacts on gas diffusion are still unknown. Researches about the tradeoff between structural compositions and intracellular chemical components within rice leaves are still lacking. The objectives of the present study were to investigate the varietal differences in leaf structure and leaf chemical compositions, and the tradeoff between leaf structural tissues and intracellular chemical components in rice leaves. Leaf structure, leaf anatomy, leaf chemical composition concentrations and gas exchange parameters were measured on eight Oryza sativa L. genotypes to investigate the intraspecific variations in leaf structure and leaf anatomy and their impacts on gas exchange parameters, and to study the tradeoff between leaf structural compositions (cell wall compounds) and intracellular chemical components (non-structural carbohydrates, nitrogen, chlorophyll). Leaf thickness increased with leaf mass per area (LMA), while leaf density did not correlate with LMA. Mesophyll cell surface area exposed to intercellular airspace (IAS) per leaf area, the surface area of chloroplasts exposed to IAS and cell wall thickness increased with LMA. Cell wall compounds accounted for 71.5 % of leaf dry mass, while mass-based nitrogen and chlorophyll concentrations decreased with LMA. Mesophyll conductance was negatively correlated with LMA and cell wall thickness. High LMA rice genotypes invest more leaf mass to cell wall and possess a low mesophyll conductance.

中文翻译：

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每单位面积的高叶质量Oryza基因型将更多叶质量投入细胞壁，并显示出低的叶肉电导率。

水稻叶片的叶内结构和解剖结构的种内变异及其对气体扩散的影响仍然未知。水稻叶片内部结构组成与细胞内化学成分之间的权衡仍然缺乏研究。本研究的目的是研究水稻叶片结构和叶片化学组成的差异，以及叶片结构组织和细胞内化学成分之间的权衡。在八种水稻上测量了叶片结构，叶片解剖结构，叶片化学成分浓度和气体交换参数L.基因型研究叶片结构和叶片解剖结构的种内变异及其对气体交换参数的影响，并研究叶片结构成分（细胞壁化合物）与细胞内化学成分（非结构性碳水化合物，氮，叶绿素）之间的权衡。叶片厚度随每单位面积叶片质量（LMA）的增加而增加，而叶片密度与LMA不相关。LMA使每叶面积暴露于细胞间空域（IAS）的叶肉细胞表面积，暴露于IAS的叶绿体表面积和细胞壁厚度随LMA增加。细胞壁化合物占叶片干重的71.5％，而基于质量的氮和叶绿素浓度随LMA降低。叶肉电导与LMA和细胞壁厚度呈负相关。