期刊
NEW PHYTOLOGIST
卷 192, 期 3, 页码 727-737出版社
WILEY-BLACKWELL
DOI: 10.1111/j.1469-8137.2011.03832.x
关键词
Brassica juncea; floral visitor; hyperaccumulator; pollen germination; selenium (Se); Stanleya pinnata
资金
- National Science Foundation [IOS-0817748]
- Colorado Native Plant Society
- Office of Science, Office of Basic Energy Sciences (OBES), of the US Department of Energy (DOE) [DE-AC02-05CH11231]
- DOE, Office of Biological and Environmental Research
- National Institutes of Health, National Center for Research Resources
- REU
Selenium (Se) hyperaccumulation has a profound effect on plant-arthropod interactions. Here, we investigated floral Se distribution and speciation in flowers and the effects of floral Se on pollen quality and plant-pollinator interactions. Floral Se distribution and speciation were compared in Stanleya pinnata, an Se hyperaccumulator, and Brassica juncea, a comparable nonhyperaccumulator. Pollen germination was measured from plants grown with varying concentrations of Se and floral visitation was compared between plants with high and low Se. Stanleya pinnata preferentially allocated Se to flowers, as nontoxic methylselenocysteine (MeSeCys). Brassica juncea had higher Se concentrations in leaves than flowers, and a lower fraction of MeSeCys. For B. juncea, high floral Se concentration impaired pollen germination; in S. pinnata Se had no effect on pollen germination. Floral visitors collected from Se-rich S. pinnata contained up to 270 mu g g(-1), concentrations toxic to many herbivores. Indeed, floral visitors showed no visitation preference between high-and low-Se plants. Honey from seleniferous areas contained 0.4-1 mu g Se g(-1), concentrations that could provide human health benefits. This study is the first to shed light on the possible evolutionary cost, through decreased pollen germination in B. juncea, of Se accumulation and has implications for the management of seleniferous areas.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据