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Vegetative and reproductive traits of Sagittaria trifolia (Alismataceae) in response to sediment heterogeneity and plant density

文献类型： 外文期刊

作者： Zou, Yingying 2 ; Wang, Jinwang 1 ;

作者机构： 1.Zhejiang Acad Agr Sci, Zhejiang Inst Subtrop Crops, Wenzhou City 325005, Peoples R China

2.Wenzhou Inst Ind Sci, Wenzhou, Peoples R China

关键词： aquatic plant;reproductive allocation;root distribution;sediment heterogeneity;plant density.

期刊名称：FUNDAMENTAL AND APPLIED LIMNOLOGY （ 影响因子：1.148； 五年影响因子：1.182 ）

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收录情况： SCI

摘要： Changes in vegetative and reproductive traits of the emergent aquatic plant Sagittaria trifolia (Alismataceae) in response to sediment heterogeneity and plant density were investigated under two sediment treatments (homogeneous and heterogeneous) and three density treatments (10, 30, and 100 plants m–2). For the heterogeneous sediment treatment (He), an experimental bin was constructed with clay on the top layer and sandy loam on the bottom layer. For the homogeneous treatment (Ho), an equal mixture of clay and sandy loams was placed in both layers. The biomass accumulation per bin was not affected by plant density or sediment type; however, individual biomass was affected by both factors. The root-to-leaf ratio was only affected by density, whereas root distribution was only affected by sediment type. In the He treatment group, 54–56 % of the roots were located in the top layer. In contrast, the Ho treatment group had 52–53 % of the roots located in the bottom layer. Plants of S. trifolia produced male-biased fl oral sex ratios with fl ower numbers that increased in the later infl orescences. Moreover, the ratio of female to male fl ower production (F/M) increased signifi cantly with the infl orescence number. The relative allocation to sexual and asexual reproduction was 7 % and 60 % higher in the He treatment than in the Ho treatment, respectively. When plant density increased from 10 to 100 plants m2, the relative allocation to asexual reproduction increased from 0.03 to 0.12, but the relative allocation to sexual reproduction decreased from 0.41 to 0.19, respectively. These data indicate that reproduction is shifted towards an asexual mode at higher plant densities. Our results suggest that S. trifolia can adjust its vegetative traits and reproductive strategy in response to plant density and sediment type. This hypothesis is consistent with the view that monoecy is a fl exible sexual strategy for adjusting male and female allocation in various environments.

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