Modeling gynodioecy: Novel scenarios for maintaining polymorphism

被引:81
作者
Bailey, MF [1 ]
Delph, LF [1 ]
Lively, CM [1 ]
机构
[1] Indiana Univ, Dept Biol, Bloomington, IN 47405 USA
关键词
model; nuclear-cytoplasmic gynodioecy; cytoplasmic male sterility; breeding system evolution;
D O I
10.1086/374803
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
Nuclear-cytoplasmic gynodioecy is a breeding system of plants in which females and hermaphrodites co-occur in populations, and gender is jointly determined by cytoplasmic male sterility (CMS) genes and nuclear restorers of male fertility. Persistent polymorphism at both CMS and nuclear-restorer loci is necessary to maintain this breeding system. Theoretical models have explained how nuclear-cytoplasmic gynodioecy can be stable for certain assumptions. However, recent advances in our understanding of the genetics, population biology, and molecular mechanisms of sex determination in nuclear-cytoplasmic gynodioecious species suggest the utility of new models with different underlying assumptions. In this article, we examine different negative pleiotropic fitness effects of nuclear restorers (costs of restoration) using genetic and population assumptions based on recent literature. Specifically, we model populations with two CMS types and separate nuclear restorer loci for each CMS type. Under these assumptions, both overdominance for fitness and frequency-dependent selection at nuclear-restorer loci can support nuclear-cytoplasmic gynodioecy. Costs of restoration can be either dependent or independent of the cytoplasmic background. Seed fitness costs are more vulnerable to fixation of CMS types than pollen costs. Survivorship costs are effective at maintaining polymorphism even when total reproductive effects are low. Overall, our models display differences in the stability of nuclear-cytoplasmic gynodioecy and predicted population sex ratios that should be informative to researchers studying gynodioecy in the wild.
引用
收藏
页码:762 / 776
页数:15
相关论文
共 38 条
[1]   COMPLEX DETERMINATION OF MALE-STERILITY IN THYMUS-VULGARIS L - GENETIC AND MOLECULAR ANALYSIS [J].
BELHASSEN, E ;
DOMMEE, B ;
ATLAN, A ;
GOUYON, PH ;
POMENTE, D ;
ASSOUAD, MW ;
COUVET, D .
THEORETICAL AND APPLIED GENETICS, 1991, 82 (02) :137-143
[2]   SPATIOTEMPORAL VARIATION OF MALE STERILE FREQUENCIES IN 2 NATURAL-POPULATIONS OF BETA-MARITIMA [J].
BOUTINSTADLER, V ;
SAUMITOULAPRADE, P ;
VALERO, M ;
JEAN, R ;
VERNET, P .
HEREDITY, 1989, 63 :395-400
[3]   Unique aspects of cytoplasmic male sterility and fertility restoration in Brassica napus [J].
Brown, GG .
JOURNAL OF HEREDITY, 1999, 90 (03) :351-356
[4]  
Charlesworth D, 1998, GENETICS, V150, P1267
[5]   A FURTHER STUDY OF THE PROBLEM OF THE MAINTENANCE OF FEMALES IN GYNODIOECIOUS SPECIES [J].
CHARLESWORTH, D .
HEREDITY, 1981, 46 (FEB) :27-39
[6]   GENETICS OF MALE-STERILITY IN GYNODIOECIOUS CORTADERIA (GRAMINEAE) [J].
CONNOR, HE ;
CHARLESWORTH, D .
HEREDITY, 1989, 63 :373-382
[7]  
Darwin C., 1876, EFFECTS CROSS SELF F
[8]   Effects of CMS types and restorer alleles on plant performance in Plantago lanceolata L.: an indication for cost of restoration [J].
deHaan, AA ;
Hundscheid, MPJ ;
vanHinsberg, A .
JOURNAL OF EVOLUTIONARY BIOLOGY, 1997, 10 (05) :803-820
[9]   The dynamics of gynodioecy in Plantago lanceolata L. .1. Frequencies of male-steriles and their cytoplasmic male sterility types [J].
DeHaan, AA ;
Luyten, RMJM ;
BakxSchotman, TJMT ;
VanDamme, JMM .
HEREDITY, 1997, 79 (5) :453-462
[10]  
DELANNAY X, 1981, GENETICS, V99, P169