利用茶树叶片解剖结构指数预测茶树种质材料的抗寒性

本文以表型性状优良的50份黄山群体种种质材料为研究对象，测定和分析它们的叶片解剖结构。结果表明，50份种质材料的栅栏组织厚度与海绵组织厚度比值（X1）、上表皮厚度与海绵组织厚度比值（X2）、栅栏组织厚度与总厚度厚度比值（X3）、角质层厚度与总厚度比值（X4）以及海绵组织厚度与总厚度比值（X5）等都存在显著差异；提出叶片解剖结构指数（Y）的计算公式为Y=0.5X1+0.2X2+0.2X3+0.05X4+0.05X5；依据解剖结构指数50份种质材料及4个对照品种被聚类成三个不同特点的类群，并且可以预测第一、二类群中的30份材料具有较强的抗寒能力。茶树叶片解剖结构指数的评价体系，可应用于茶树幼苗期抗寒性的早期鉴定。

Cold Resistant Prediction of Tea Germplasm Resources Applied by Anatomical Structure Index of Leaves

Anatomical structure of leaves sampled from fifty specimens of tea germplasm resources, which had distinct phenotypic character and were selected from the species of Huangshan population, were analyzed. The results indicated that five ratio of those gemplasms varied significantly, including palisade tissue thickness to spongy tissue thickness (X1), upper epidermis thickness to spongy tissue thickness (X2), palisade tissue thickness to total thickness (X3), horny layer thickness to total thickness (X4), and spongy tissue thickness to total thickness (X5). The computing formula of anatomical structure index of leaves (Y) was made to be Y = 0.5X1 + 0.2X2 + 0.2X3 + 0.05X4 + 0.05X5. Those germplasms could be clustered to three different groups, among which thirty germplasms belonged to the first group and the second group were predicted to have strong resistance to cold. The evaluation system built by anatomical structure index of leaves could be used to identify cold resistance in period of young seedling.