Advanced   Register
XTBG OpenIR  > 植物进化生态研究组  > 期刊论文

title: Floral sex allocation and reproductive success within inflorescences of Hosta ventricosa, a pseudogamous apomict
author: Cao, Guo-Xing;  Xie, Ting;  Wu, Bi-Xian;  Yang, Chun-Ping
Issued Date: 2015
Abstract: Aims Within inflorescences of sexually reproducing hermaphrodites, the production of ovules, fruits and seeds commonly declines from basal (early-opening) to distal (late-opening) flowers, while pollen production remains constant or only changes slightly, with the result that distal (late-opening) flowers become functionally male. However, few empirical studies have specifically examined whether or not changes in allocation to pollen production actually lead to changes in the number of seeds sired, a more direct measure of male fitness. In pseudogamous apomicts, fitness depends on the number of seeds produced; thus, a contrasting pattern of variation in the pollen-to-ovule (P/O) ratio within inflorescences might be expected. Methods We investigated floral sex allocation and reproductive success within racemes of Hosta ventricosa, a pseudogamous apomictic hermaphrodite possessing flowers that open acropetally. We quantified variations in pollen number, ovule number, the P/O ratio and fruit and seed production, from 2007 to 2011, among flowers within racemes of four populations of H. ventricosa in southwest China. Ecological causes for fruit and seed production were evaluated by observing patterns of pollen deposition, flower removal and supplemental pollination. Important Findings Pollen number, ovule number and the P/O ratio declined from basal-to-distal positions in all sampled populations (years). Fruit and seed production decreased distally in most populations (years). Low fruit and seed set of distal flowers was not due to pollen limitation because pollen deposition never declined distally and the low fruit and seed set of distal flowers remained even after supplementary pollination was provided. The flower-removal experiment indicated that inter-fruit competition for resources among flowers was common. The low P/O ratio of distal flowers in H. ventricosa might be favored because they were unable to obtain fitness by donating pollen and siring seeds on other plants. Our study may help to understand the adaptive significance of sex allocation among flowers within inflorescences of sexually reproducing hermaphrodites.
Source: JOURNAL OF PLANT ECOLOGY
Related URLs: 10.1093/jpe/rtv010
Appears in Collections:植物进化生态研究组_期刊论文

Files in This Item:

File SizeFormat
Floral sex allocation and reproductive success within inflorescences of Hosta ventricosa, a pseudogamous apomict.pdf2280KbAdobe PDFView  Download


全文许可: Creative Commons 署名-非商业性使用-相同方式共享 3.0

Recommended Citation:
Cao, Guo-Xing,Xie, Ting,Wu, Bi-Xian,et al. Floral Sex Allocation And Reproductive Success Within Inflorescences Of Hosta Ventricosa, A Pseudogamous Apomict[J]. Journal Of Plant Ecology,2015,8(2):142-153.

SCI Citaion Data:
Service
 Recommend this item
 Sava as my favorate item
 Show this item's statistics
 Export Endnote File
Google Scholar
 Similar articles in Google Scholar
 [Cao, Guo-Xing]'s Articles
 [Xie, Ting]'s Articles
 [Wu, Bi-Xian]'s Articles
CSDL cross search
 Similar articles in CSDL Cross Search
 [Cao, Guo-Xing]‘s Articles
 [Xie, Ting]‘s Articles
 [Wu, Bi-Xian]‘s Articles
Scirus search
 Similar articles in Scirus
Related Copyright Policies
Null
Social Bookmarking
  Add to CiteULike  Add to Connotea  Add to Del.icio.us  Add to Digg  Add to Reddit 
所有评论 (0)
暂无评论
 
评注功能仅针对注册用户开放,请您登录
您对该条目有什么异议,请填写以下表单,管理员会尽快联系您。
内 容:
Email:  *
单位:
验证码:   刷新
您在IR的使用过程中有什么好的想法或者建议可以反馈给我们。
标 题:
 *
内 容:
Email:  *
验证码:   刷新

Items in IR are protected by copyright, with all rights reserved, unless otherwise indicated.

 

 

Valid XHTML 1.0!
Powered by CSpace