青藏高原特有植物块茎堇菜异型性种子萌发特性及其生态适应
Germination Characteristics and Ecological Adaptation of Heteromorphic Seeds of Viola tuberifera in Qinghai-Tibet Plateau
侯云云 1吴琼 1高婷1
作者信息
- 1. 西北师范大学生命科学学院,甘肃兰州730070
- 折叠
摘要
[目的]明确青藏高原特有植物块茎堇菜异型性种子的萌发特性,为进一步揭示其生理生态适应机制提供理论依据.[方法]研究块茎堇菜地上开放花(CH)种子、地上闭锁花(CL)种子和地下CL种子3种异型体种子的形态特征及萌发特性.[结果]3种类型的种子颜色和形状存在差异,种子大小和质量无显著差异;CH种子和地上、地下CL种子萌发率均较低,最高分别为35.56％、33.33％和3.33％;延长储藏时间均能显著促进地上CH和CL种子的萌发,也能部分提高地下CL种子的萌发率.[结论]块茎堇菜异型性种子不同的萌发特性提高了该物种在高度异质性环境中的适合度,对种群能成功地适应高寒环境具有重要意义.
Abstract
[Objective] To find the germination characteristics of heteromorphic seeds of Viola tuberifera in Qinghai-Tibet Plateau,and to further reveal their physiological traits.[Method] Morphological characteristics and germination characteristics of three heteromorphic seeds of V.tuberifera were researched,including the aboveground CH (chasmogamous flowers) seeds,aboveground CL (cleistogamous flowers) seeds and underground CL (cleistogamous flowers) seeds.[Result] The three types of seeds were different in color and shape,but they did not have significant differences in size sand mass.The germination rates of aboveground CH seeds and two types of CL seeds were relatively low,which were 35.56％,33.33％ and 3.33％,respectively.Prolonging storage period could significantly increase the germination of aboveground CH and CL seeds,and partly enhanced the germination rate of underground CL seeds,suggesting that aboveground CH and CL seeds were non-deep physiological dormancy;while underground CL seeds belonged to deep physiological dormancy.[Conclusion] Germination characteristics of heteromorphic seeds of V.tuberifera increase the species' fitness to heterogeneous habitats and form an ecological adaptive strategy that may allow V.tuberifera to successfully adapt to the alpine environment.
关键词
块茎堇菜/种子异型性/生态适应Key words
Viola tuberifera/Seed heteromorphism/Ecological adaptation引用本文复制引用
出版年
2016
国家科技期刊平台
NSTL
万方数据