植物研究2024，Vol.44Issue(3)：389-399,11.DOI:10.7525/j.issn.1673-5102.2024.03.008
中国特有种大理白前对高寒环境的形态适应特征
Morphological Adaptation to Alpine Environment of a Chinese Endemic Species,Cynanchum forrestii
摘要
Abstract
Alpine meadows exhibited environmental characteristics such as intense radiation,low air pressure,strong winds and sudden changes in diurnal temperature,which were unfavorable for plant growth.In order to explore the ecological adaptability of Cynanchum forrestii,an endemic species of China to the alpine meadow environment(altitudes of 3 100-3 500 m)in Jiulong County,southwest Sichuan Province,the anatomical features of various organs of C.forrestii were examined by optical microscopy and scanning electron microscopy,and the pollen and seed viability were analyzed by the TCC method.The results showed that the leaves,stems and flowers of C.forrestii were covered with epidermis composed of rich single-row cells;the cuticle of leaf and stems epidermis was thick;the stomata were large and located on the lower surface of the leaves,palisade tissue and sponge tissue were developed;the stem epidermal cells were small and the cell wall was thick,and the cortex was composed of seven layers of cells,which were closely arranged,there were rich substances stored in the stem cells,and the vascular columns accounted for a large proportion of stem,the pith was developed and rich in stored substances;the root vascular tissue was well-developed,rich storage substances in cortical cells;the characteristics of high seed and pollen vitality,combined corolla,combined pistil column,the seed had seed hair,and thick and hard seed coat provide guaranteed for improving reproductive efficiency.The above results indicated that C.forrestii possessed a comprehensive array of external and internal structural characteristics,which enabled adaption to high-altitude cold environments while maintaining elevated levels of radiation resistance,drought resistance,and cold tolerance,and laid a structural foundation for the successful survival and reproduction of C.forrestii in the alpine environment.关键词
大理白前/高寒草甸/形态解剖特征/花粉和种子的生活力/生态适应性Key words
Cynanchum forrestii/alpine meadow/morphological and anatomical characteristics/vitality of pollen and seeds/ecological adaptability分类
农业科技引用本文复制引用
唐双龙,陈时鑫,王煜,马丹炜,杨世辉,聂申明,扎西泽里,田正友..中国特有种大理白前对高寒环境的形态适应特征[J].植物研究,2024,44(3):389-399,11.基金项目
第四次全国中药资源普查(2019PC006) （2019PC006）
九龙县中藏药资源调查及研究(HX20220274) （HX20220274）
四川省科技厅青年科学基金项目(2021YJ0497). （2021YJ0497）
