Qifa Zhang
National Key Laboratory of Crop Genetic Improvement and National Centre of Plant Gene Research (Wuhan), Huazhong Agricultural University, Wuhan 430070, China
More InformationCorresponding author: E-mail address: diana1983941@mail.hzau.edu.cn (Yidan Ouyang)
Received Date: 2018-07-25
Accepted Date:2018-10-30
Rev Recd Date:2018-09-19
Available Online: 2018-11-05 Publish Date:2018-11-20
Abstract
Abstract
Reproductive isolation is defined as processes that prevent individuals of different populations from mating, survival or producing fertile offspring. Reproductive isolation is critical for driving speciation and maintaining species identity, which has been a fundamental concern in evolutionary biology. In plants, reproductive isolation can be divided into prezygotic and postzygotic reproductive barriers, according to its occurrence at different developmental stages. Postzygotic reproductive isolation caused by reduced fitness in hybrids is frequently observed in plants, which hinders gene flow between divergent populations and has substantial effects on genetic differentiation and speciation, and thus is a major obstacle for utilization of heterosis in hybrid crops. During the past decade, China has made tremendous progress in molecular and evolutionary basis of prezygotic and postzygotic reproductive barriers in plants. Present understandings in reproductive isolation especially with new data in the last several years well support three evolutionary genetic models, which represent a general mechanism underlying genomic differentiation and speciation. The updated understanding will offer new approaches for the development of wide-compatibility or neutral varieties, which facilitate breeding of hybrid rice as well as other hybrid crops.Keywords: Reproductive isolation,
Parallel divergence model,
Sequential divergence model,
Parallel-sequential divergence model,
Hybrid sterility,
Hybrid necrosis/weakness,
Hybrid lethality,
Wide-compatibility
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