糜子叶片解剖结构与其抗旱性关联研究

运用光学显微镜和扫描电镜对3个抗旱性不同的糜子品种的叶片解剖结构进行观察分析,并运用方差分析、聚类分析、相关分析和隶属函数法对其进行抗旱性评价.结果表明,糜子叶片具有旱生结构特征,叶肉细胞呈长方形,且长轴方向垂直与叶片表面,上下表面都有气孔分布,下表皮气孔下陷,气孔密度大于上表皮,上下表皮被有蜡质和表皮毛;参试材料18个旱生结构指标中的10个差异显著或极显著,并聚为4类;通过相关分析筛选出叶肉细胞表面积、上表皮长细胞长度、下表皮气孑孔长度、泡状细胞长度是各类的典型指标,应用隶属函数法综合评价参试糜子品种抗旱能力,由强到弱依次为:陇糜8号、内糜5号、榆糜3号.

Anatomical Structure and Drought Resistance in Broomcorn Millet Leaf

The leaves anatomical structures of three broomcorn millet varieties were observed and analyzed by optical microscopy and scanning electron microscopy, and their drought resistances were evaluated by ANOVA analysis, clustering analysis, correlation analysis and subordinate function. The results showed that broomcorn millet leaves had the xerophytic structure characteristics. The mesophyll cells were rectangular, and their long axis was perpendicular to blade surface; stomas distributed in up and down epidermis, stomas in down epidermis were sunken, and their density was larger than that in up epidermis. Moreover, the up and down epidermis had wax and epidermal hair. There were significant or extreme significant differences in 10 indices out of 18 selected indices and clustered into four groups. Through correlation analysis, mesophyll cell size, long cell length of up epidermis, stomata length of down epidermis and alveolar cells length were selected as the typical index of each group, respectively. According to the results of subordinate function, the sorting order of drought resistance from strong to weak was Longmi No.8, Neimi No.5 and Yumi No.3.