二型花柱植物滇丁香二态和单态种群间花部形态变异模式
收稿日期: 2015-01-22
网络出版日期: 2015-03-25
基金资助
The National Key Basic Research Program of China (2014CB954100), the Key Research Program of the Chinese Academic of Sciences (KJZDEWL07), the National Natural Science Foundation of China (31200289, 31570384, 31320103919), and the Natural Science Foundation of Yunnan Province (2012FB182)
Patterns of Floral Variation between Dimorphic and Monomorphic Populations in Distylous Luculia pinceana (Rubiaceae)
Received date: 2015-01-22
Online published: 2015-03-25
Supported by
The National Key Basic Research Program of China (2014CB954100), the Key Research Program of the Chinese Academic of Sciences (KJZDEWL07), the National Natural Science Foundation of China (31200289, 31570384, 31320103919), and the Natural Science Foundation of Yunnan Province (2012FB182)
花部形态特征在植物交配系统的演化与维持过程中起关键作用，交配方式的转变将可能伴随着相应花部形态的调整。为探寻交配系统与花形态变异之间的联系，本研究对二型花柱植物滇丁香 （Luculia pinceana） 的二态和单态种群的花部形态特征进行比较分析。结果表明花部形态在两种不同花型构造的种群间分化程度显著大于花型构造相同的种群间变异。相对于二态种群而言，长花柱的单态种群中雌雄异位距离缩小，且个体间雌雄生殖器官在空间上的非法重叠程度增高，花部形态的调整能够同时促进自交和同型异交。在异型花柱物种内，异交为主的二型花柱种群向单态种群转变过程中自交比率预期上升，本研究表明花部形态的变异模式与交配系统转变相一致。
周伟1、2 , 李德铢1、2 , 王红1 . 二型花柱植物滇丁香二态和单态种群间花部形态变异模式[J]. Plant Diversity, 2015 , 37(05) : 513 -521 . DOI: 10.7677/ynzwyj201515011
Flower morphology plays an important role in the evolution and maintenance of plant mating systems, including disassortative mating of heterostylous species. The transition of mating patterns may be associated with the remodification of intraspecific flower morphology. To determine the functional relationship between floral variation and transition of mating patterns, we conducted a series of morphometric analyses in a distylous species Luculia pinceana, which possesses dimorphic and monomorphic populations. Our results indicate that floral variation was higher between different types of populations than between populations of the same type. Compared to dimorphic populations, some floral characters, reduced stigmaanther separation within flowers and increased overlap of stigmas and anthers (illegitimate spatial matching of sexual organs) among individuals in populations containing only the longstyled morph may have been modified to increase both selfing and intramorph crossing. The observed patterns of floral variation between dimorphic and monomorphic populations coincide with the transition of mating patterns from disassortative mating to selfing and/or intramorph crossing.
Key words： Luculia pinceana; Distyly; Floral morphological variation; Dimorphic; Monomorphic
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