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Evolutionary tradeoffs for nitrogen allocation to photosynthesis versus cell walls in an invasive plant.

Abstract：

:Many studies have shown that individuals from invasive populations of many different plant species grow larger than individuals from native populations and that this difference has a genetic basis. This increased vigor in invasive populations is thought to be due to life history tradeoffs, in which selection favors the loss of costly defense traits, thereby freeing resources that can be devoted to increased growth or fecundity. Despite the theoretical importance of such allocation shifts for invasions, there have been no efforts to understand apparent evolutionary shifts in defense-growth allocation mechanistically. Reallocation of nitrogen (N) to photosynthesis is likely to play a crucial role in any growth increase; however, no study has been conducted to explore potential evolutionary changes in N allocation of introduced plants. Here, we show that introduced Ageratina adenophora, a noxious invasive plant throughout the subtropics, appears to have evolved increased N allocation to photosynthesis (growth) and reduced allocation to cell walls, resulting in poorer structural defenses. Our results provide a potential mechanism behind the commonly observed and genetically based increase in plant growth and vigor when they are introduced to new ranges.

journal_name

Proc Natl Acad Sci U S A

journal_title

Proceedings of the National Academy of Sciences of the United States of America

authors

Feng YL,Lei YB,Wang RF,Callaway RM,Valiente-Banuet A,Inderjit,Li YP,Zheng YL

doi

10.1073/pnas.0808434106

subject

Has Abstract

pub_date

2009-02-10 00:00:00

pages

1853-6

issue

6

eissn

0027-8424

issn

1091-6490

pii

0808434106

journal_volume

106

pub_type

杂志文章

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