When a plant increases resource allocation to reproduction from its limited reserves, the allocation to the other functions is reduced. Because of these trade-offs, differences in reproductive allocation are believed to result in relative differences in life history traits. Dioecious plants provide an excellent opportunity for detecting such possible trade-offs in resource allocation. This study aims to present a finding about the gender-based cost of reproductive allocation. The trade-off between reproduction and foliage biomass was examined at different modular levels (shoot/sub-branch, branch, and shrub/tree level). There were no intra-annual trade-offs between reproduction and foliage biomass in either sex of either species at shoot/sub-branch level, branch level and shrub level. Inter-annual trade-offs were detected in females for both species. Inter-annual trade-offs existed at all three different modular levels in R. schneideri females, while the evidence of inter-annual trade-offs was only detected at branch level in R. davurica females. At the population level, the sex ratio was female-biased in 2010, and it did not significantly deviate from 1:1 in 2011 in R. davurica. However, the sex ratios were significantly female-biased in both 2010 and 2011 in R. schneideri. This study has shown that the degree of autonomy of the different plant organs influenced the trade-offs between reproduction and growth, which suggests a species- and sex-dependent modular autonomy.
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Citation
Wang J, Zhang C, Zhao X, von Gadow K (2014). Reproductive allocation of two dioecious Rhamnus species in temperate forests of northeast China. iForest 7: 25-32. - doi: 10.3832/ifor1020-007
Academic Editor
Roberto Tognetti
Paper history
Received: Apr 24, 2013
Accepted: Aug 02, 2013
First online: Oct 14, 2013
Publication Date: Feb 03, 2014
Publication Time: 2.43 months
© SISEF - The Italian Society of Silviculture and Forest Ecology 2014
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This article is distributed under the terms of the Creative Commons Attribution-Non Commercial 4.0 International (https://creativecommons.org/licenses/by-nc/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
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