%0 Journal Article
%T Position-dependent sex allocation within inflorescence of Aconitum gymnandrum Maxim<br>露蕊乌头（Aconitum gymnandrum Maxim）花序内位置依赖的性分配
%A FAN Bao-Li
%A ZHAO Zhi-Gang
%A MENG Jin-Liu
%A DU Guo-Zhen
%A <br>樊宝丽
%A 赵志刚
%A 孟金柳
%A 杜国祯
%J 生态学报
%D 2008
%I 
%X The question of which resource allocation patterns will be selected to ensure male and female reproductive success has attracted many researchers, especially in reference to plants of alpine environments. This study investigated the pattern of reproductive allocation within inflorescences of Aconitum gymnandrum Maxim, a common species of the Qinghai-Tibet Plateau, and experimentally explored the potential mechanism underlying this pattern. Data on floral allocation and seed production in bottom, middle, and top flowers in racemes of A. gymnandrum were gathered in a variety of sub-alpine and alpine meadows, and their maternal plants were collected. A flower-removal experiment also was performed, to determine whether allocation was affected by within-raceme competition. These data were analyzed with repeated-measures analysis of variance and two-way analysis of variance. Results showed that there was a marked decline in carpel number, female mass, seed number, and seed mass per fruit with flowering sequence within a raceme, while anther number, male/female mass ratio and pollen/ovule ratio increased. Floral sex allocation was male-biased in top flowers, while seed set was constant among positions. Variation in the amount of pollen received cannot explain the observed results, and the flower-removal experiment did not improve the seed set of the remaining flowers, indicating that an unavoidable architectural effect has led to the position-dependent pattern of sex allocation with raceme.
%K alpine meadow
%K Aconitum gymnandrum Maxim
%K sex allocation
%K mating
%K architectural effect<br>高寒草甸
%K 露蕊乌头(Aconitum
%K gymnandrum
%K Maxim)
%K 性分配
%K 交配环境
%K 位置效应
%K 露蕊乌头
%K Maxim
%K Aconitum
%K 位置效应
%K 分配模式
%K 种子大小
%K 实验
%K 花粉数量
%K 差异
%K 结籽率
%K 表现
%K 雄蕊
%K 胚珠
%K 花药
%K 种子数
%K 雌蕊
%K 心皮
%K 发现
%K 研究
%K 高寒草甸
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=90BA3D13E7F3BC869AC96FB3DA594E3FE34FBF7B8BC0E591&jid=FE163E5DB2274E5937319DE98913EC37&aid=A21415BD6E0279A315A84DA9E94FE8C5&yid=67289AFF6305E306&vid=D3E34374A0D77D7F&iid=B31275AF3241DB2D&sid=E4684B539AF41B2B&eid=64DB559EBAD5412BFC1CE374F5EE51AA&journal_id=1000-0933&journal_name=生态学报&referenced_num=5&reference_num=35