Species Selection Maintains Self-Incompatibility

被引:368
作者
Goldberg, Emma E. [1 ]
Kohn, Joshua R. [2 ]
Lande, Russell [3 ]
Robertson, Kelly A. [1 ]
Smith, Stephen A. [4 ]
Igic, Boris [1 ]
机构
[1] Univ Illinois, Dept Biol Sci, Chicago, IL 60607 USA
[2] Univ Calif San Diego, Div Biol Sci, La Jolla, CA 92093 USA
[3] Univ London Imperial Coll Sci Technol & Med, Div Biol, Ascot SL5 7PY, Berks, England
[4] Natl Evolutionary Synth Ctr, Durham, NC 27705 USA
基金
美国国家科学基金会;
关键词
MATING SYSTEMS; POLYMORPHISM; EVOLUTION; DIVERSIFICATION; FERTILIZATION; SPECIATION; DIVERSITY; PLANTS; RATES;
D O I
10.1126/science.1194513
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Identifying traits that affect rates of speciation and extinction and, hence, explain differences in species diversity among clades is a major goal of evolutionary biology. Detecting such traits is especially difficult when they undergo frequent transitions between states. Self-incompatibility, the ability of hermaphrodites to enforce outcrossing, is frequently lost in flowering plants, enabling self-fertilization. We show, however, that in the nightshade plant family (Solanaceae), species with functional self-incompatibility diversify at a significantly higher rate than those without it. The apparent short-term advantages of potentially self-fertilizing individuals are therefore offset by strong species selection, which favors obligate outcrossing.
引用
收藏
页码:493 / 495
页数:3
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