期刊论文

中文

西北植物学报

1000-4025

2016

36

1

70-77

10.7606/j.issn.1000-4025.2016.01.0070

国家自然科学基金

本校为第一机构

采用常规石蜡制片技术和显微观察方法,对生长于滇西北玉龙雪山3 000~4 600 m之间9个不同海拔高度的草血竭(Polygonum paleaceum)叶片表型及解剖结构进行比较研究,其目的是揭示该植物对不同海拔环境条件的响应特征,进而探讨植物对全球气候变化的生态适应性。结果显示:(1)草血竭叶片长度、宽度、长宽比均与海拔呈显著负相关关系,其降幅分别达84.64%、74.87%和37.50%。(2)草血竭叶片为异面叶,由表皮、叶肉、叶脉三部分组成;表皮细胞单层,角质层厚;叶肉的栅栏组织具2层或3层细胞;叶脉中的维管束呈1圈不连续的环状排列。(3)叶片厚度、栅栏组织厚度、海绵组织厚度、主脉厚度、以及主脉中.维管束的长度...

Leaves exhibit great phenotypic plastic in both morphology and anatomic structure, and are the most sensitive organ to environmental changes. In this study, leaves of Polygonum paleaceum living at nine altitudes ranged from 3 000 to 4 600 m in Yulong Mountains were sampled. Then the morphological and anatomical structures of these leaves were studied by the paraffin section method and microscopic techniques. The aim is to reveal the adaptive strategy of this plant to different altitudes. The results showed : (1) length,width,and ratio of length to width all decrease with rising altitude,the ma...