白掌叶片生长定量分析与生长模型的构建

以‘美酒’(Spathiphyllum ‘Mojo’)、‘绿巨人’(Spathiphyllum ‘Sensation’)、‘皇后’(Spathiphyllum ‘Queen’) 3个不同叶型的白掌(Spathiphyllum )品种为材料，测定了其叶片生长过程中叶片宽度、叶片长度、叶面积、叶脉数、叶厚度、叶尖夹角和叶片全长，定量分析了叶片生长性状、不同品种间的差异，构建了主要性状的生长模型。结果表明:叶长度与宽度随时间变化的生长进程二维构图呈漏斗形；叶片宽度、叶长、叶面积、叶全长随时间进程而产生较大变化。生长完成的叶片形态在品种间差异显著，叶全长、叶片长度、叶厚度等是叶部形态产生差异的主要性状。选择叶片宽度、叶长、叶面积、叶全长构建了Logistic生长模型y=K/(1+ae?bt)，这几个性状生长方程的拟合度R2均超过0.97，实测值与理论值相关系数超过0.99，说明这个数学模型能很好地揭示白掌叶片的生长规律。基于生长模型方程求导，结合叶片形态变化，可将白掌叶片生长过程分为生长期、快速生长期、生长后期3个时期。3个品种的8个叶片性状变异系数分布从18.07%到88.85%，Shannon遗传多样性指数H′在2.94～3.28之间，表明性状有遗传的多样性。

A Quantitative Analysis ofLeaf Growth and Establishment of Leaf Growth Logistics Model for Spathiphyllum

The leaf width, leaf length, leaf area, leaf vein number, leaf apex angle, fullleaf length and leaf SPAD of three Spathiphyllum cultivars, ‘Mojo’, ‘Sensation’ and ‘Queen’, with different leaf shapes were measured during the leaf growth stages, and the resultingdata were statistically analyzed to determine the quantitative leaf growth of the three cultivars, and fitted to the logistic equation as leaf growth models. A funnel-shaped plot presented a great change in a two-dimensional dynamic pattern of full leaf length and leaf width over time. Fully-expanded leaves were significantly different in leaf morphology among the three cultivars, and full leaf length, leaf length and leaf thickness were key characters that contributed to significant differences in leaf morphology among the cultivars. Full leaf length, leaf length, leaf width, leaf area were selected, based on which a Logistic growth model y=K/(1+ae?bt) was established. Fitting degree R2 of the Logistic growth equation for these four characters was above 0.97, and the coefficients between the measured and theoretical values were all above 0.99, which means the equation is suitable for fitting the growth of theSpathiphyllumleaves. Start-up growth stage, fast-growth stage and post-growth stage were deduced for Spathiphyllumleaf growth through the derivation of the Logistic growth equation combining with the leaf morphological changes. The coefficients of variation of the 8 main leaf characters of the three Spathiphyllum cultivars were distributed to a range between 18.07% and 88.85%, and the Shannon genetic diversity index H′ was 2.94?3.28, indicating a genetic diversity of the leaf characters inSpathiphyllum.