摘要
生殖构件是研究单性花同株植物性别分化影响因素的基础。本文描述了攀枝花市几个麻疯树林分的生殖构件数量特征和雌雄花配置问题,分析了影响生殖构件的可能因素,为认识麻疯树生殖特性提供了基础资料。麻疯树生殖构件的枝条长度主要以0.3 cm^15 cm、直径以0.5 cm^1.0 cm之间的枝条为主体,该区段生殖构件分布的频度较高。同时,麻疯树的雌花数量、雄花数量和花总数的数量结构都可以看出,分布图为偏左分布,表明这些生殖参数以低数量为主体。在样地水平上,不同调查样地麻疯树生殖构件的大小明显不同,可能受到土壤厚度的影响。麻疯树枝条大小(体积)是花数量的决定性因素,表明了枝条营养对生殖构件影响的有效性。麻疯树雌雄花配置存在明显的线性相关,暗示了麻疯树雌花比例或性比可能存在一定程度的遗传稳定性。雌花比例或性比与雄花数量、花总数无关,表明了雌花比例或性比决定受到环境因素影响。总之,攀枝花市麻疯树生殖构件偏小,性比较低,可能受到林分密度和土壤厚度等因素的影响。
The reproductive modulus was the basis of studying the sex differences and its influencing factors of monoecious plants. In this paper, a description is given of the quantity characteristics and male and female allocation of reproductive moduli in some forests of Jatropha curcas in Panzhihua City, and analysis is made of the possible factors affecting reproductive moduli, aiming to provide basic information on understanding the reproductive feature of Jatropha curcas. The frequency of branch size was mainly composed of 0. 3 cm ～ 15 cm （length） and 0. 5 cm - 1.0 cm （diameter） ,which occupied 77.3% and 79.95% of total modular quantity respectively. At the same time, the quantity distribution of female, male and total flower amounts demonstrated that the column figure was partial distribution-left pattern, implying that low size class of these reproductive parameters was the main parts of moduli. In the plot level, some plots of investigation had obvious size of reproductive moduli ,which was probably affected by soil depth. The flower amounts of Jatropha curcas were dependent on branch size （ volume）, indicating that the branch nutrition （ indexed by size） had available influences on reproductive moduli. The amounts of male and female flowers had a linear relation between them, implying that the proportion of female flower or sex ratio prob- ably had genetic stability to some degree. Correlation analysis indicated that proportion of female flowers or sex ratio had no correlation to male and total flowers of Jatropha curcas and demonstrated that female pro- portion or sex ratio were affected by environmental factors. Summarily, there were a smaller size and lower sex ratio of the reproductive moduli of Jatropha curcas in Panzhihua City, which was probably affected by these factors, such as forest density and soil depth, etc.
出处
《四川林业科技》
2009年第1期8-17,共10页
Journal of Sichuan Forestry Science and Technology
基金
四川省麻疯树资源培育科技支撑项目
西南地区麻疯树资源良种选育及规模化
综合利用关键技术研究与示范项目
关键词
麻疯树
生殖构件
性比
性配置
Jatropha curcas, Reproductive modular, Sex ratio, Sex allocation
