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重齿风毛菊繁殖分配及花部特征与海拔的相关性

毛婉嫕,王一峰*,杨励龙,宋卫东,马文梅   

  1. (西北师范大学生命科学学院, 兰州 730070)
  • 出版日期:2019-01-10 发布日期:2019-01-10

Reproductive allocation and floral characteristic of Saussurea katochaete in relation to elevation.

MAO Wan-yi, WANG Yi-feng*, YANG Li-long, SONG Wei-dong, MA Wen-mei   

  1. (College of Life Sciences, Northwest Normal University, Lanzhou, 730070, China).
  • Online:2019-01-10 Published:2019-01-10

摘要:

为了解高山植物繁殖分配及花部特征对海拔梯度的响应机制,探讨高海拔环境下风毛菊属植物的繁殖对策,通过采样调查法,对分布在青藏高原不同海拔重齿风毛菊(Saussurea katochaete)盛花期的繁殖分配和花部特征进行研究。结果表明:重齿风毛菊个体大小、营养器官生物量、管状小花数目及头状花序重量与海拔呈显著负相关(P<0.01);花丝长、花粉数目与海拔呈显著负相关(P<0.01),而花药长、花柱长及花柱分支长与海拔呈显著正相关(P<0.01);繁殖器官生物量和繁殖分配是依赖个体大小的,前者与个体大小呈显著正相关(P=0.024),而后者表现出显著的负相关关系(P<0.01);重齿风毛菊管状小花数目-头状花序重量、管状小花数目-单花重量和雌蕊重量-雄蕊重量有着显著的负相关(P值分别为P<0.01和P=0.024);海拔对重齿风毛菊各生物量有着显著影响,同时个体大小也与植物的繁殖分配策略密切相关;随着海拔的升高,重齿风毛菊通过花数目-重量和雌蕊重量-雄蕊重量“此消彼长”的权衡关系,来适应环境,提高自身适合度。
 

关键词: 水稻, 重金属耐受, 类芽孢杆菌, 植酸磷

Abstract: To understand reproductive allocation and floral traits of alpine plants in response to elevation and to clarify reproductive strategies of Sausserua plants at high elevation, we investigated the reproductive allocation and floral characteristic of Saussurea katochaete Maxim at different elevations along Tibetan Plateau. The results showed that there was a significantly negative correlation between the individual size, vegetative organ biomass, the number of tubular flowers, capitulum biomass and elevation (P<0.01). The length of filaments and the number of pollen were negatively correlated with elevation (P<0.01), while the anther length, style length, and style branch length were significantly and positively correlated with elevation (P<0.01). Reproductive organ biomass and reproductive allocation depended on individual size, with the former showing a positive correlation with individual size (P=0.024) but the latter showing a negative correlation with individual size (P<0.01). There was significantly negative correlations between the number of tubular florets and the weight of capitulum (P<0.01), between the number of tubular florets and single tubular floret weight (P<0.01), and between the pistil weight and stamen weight(P=0.024). Our results indicated that elevation had a great impact on the biomass of S. katochaete. The individual size was closely related to plant reproductive allocation strategy. As the elevation increased, S. katochaete adapted to the environment and improved its own fitness through the trade-offs of the flower number versus weight and pistil weight versus stamen weight.

Key words: Paenibacillus sp., heavy metal-tolerance, phytate phosphate, rice