单、双瓣茉莉营养器官解剖结构特征及其生态适应性研究

Anatomical structure character of vegetative organ of two cultivars of Jasminum sabac and their ecological adaptations

对相同生境栽培的单、双瓣茉莉根茎叶等器官解剖结构特征研究结果表明 ,与单瓣茉莉相比 ,双瓣茉莉具有根、茎各薄壁组织淀粉粒积累量较多 ,茎次生木质部导管内无侵填体 ,茎皮层细胞层多达 2～ 4层 ,气孔器较小、密度较大且位置更下陷 ,气孔器面积 叶表面积值较小 ,叶片角质层较厚且叶肉细胞较小 ,栅栏组织厚度 叶肉组织厚度值较大 ,栅栏组织细胞排列更紧密等叶片结构特征 。

Anatomy of vegetative organs (root, stem, leaf) between Jasminum sabac (single petal) and J sabac (double petal) growing at the similar habitats was surveyed. The results show that compared to J sabac (single petal), J sabac (double petal) accumulates much more starch grains in the parenchyma of stems and roots; has much fewer tyloses in the vessel lumens of the secondary xylem of stem; the cell layers of cortex of stem are about 2～4; has smaller stomatal apparatus, higher stomata density, smaller ratio of stomatal area/leaf surface area, more sunken stomatal apparatus, smaller mesophyll cells, higher ratio of palisade tissue/mesophyll tissue, and compacter palisade tissue. Anatomical structures are presumely relative to ecological adaptations. Therefore, the differences in anatomical structures are considered to be a reason that J sabac (double petal) can survive at the lower temperature and in drier habitats than J sabac (single petal).