Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Mengla County, Yunnan, 666303, China.
Gansu Liancheng National Nature Reserve, Yongdeng County, Gansu, 730333, China.
Sci Rep. 2018 Feb 26;8(1):3634. doi: 10.1038/s41598-018-21930-9.
About 20% of angiosperms employ self-fertilization as their main mating strategy. In this study, we aimed to examine how the selfing timing correlated with floral traits in three Gentianopsis species in which autonomous selfing is achieved through filament elongation. Although the three Gentianopsis species exhibit no significant variation in their capacity for autonomous selfing, flowers of G. grandis last longer, are larger and have a higher corolla biomass, P/O ratios and male biomass allocation than those of G. paludosa, and especially those of G. contorta. Autonomous selfing occurs in the early floral life of G. paludosa and G. contorta and in the later floral life of G. grandis. Seed production mainly results from autonomous selfing in G. paludosa and G. contorta; however, G. grandis could be more described as having a mixed mating system. We suggest that autonomous selfing in later floral life increases the chance of cross-pollination prior to this, while autonomous selfing in early floral life offers a selective advantage to plants by reducing the resource investment in traits that may increase pollinator attraction and visitation.
约 20%的开花植物将自体受精作为其主要的交配策略。在这项研究中，我们旨在研究在通过花丝伸长实现自主自交的三种獐牙菜属植物中，自交时机与花部特征的相关性。尽管这三种獐牙菜属植物在自主自交能力上没有显著差异，但大花獐牙菜的花持续时间更长、更大，具有更高的花被生物量、P/O 比值和雄性生物量分配，与沼生獐牙菜相比，尤其是与扭曲獐牙菜相比。自主自交发生在沼生獐牙菜和扭曲獐牙菜的早期花生活史中，以及大花獐牙菜的晚期花生活史中。种子生产主要来自沼生獐牙菜和扭曲獐牙菜的自主自交；然而，大花獐牙菜可以被描述为具有混合交配系统。我们认为，晚期花生活史中的自主自交增加了在此之前异花授粉的机会，而早期花生活史中的自主自交通过减少可能增加传粉者吸引力和访问的性状的资源投资，为植物提供了选择优势。
