The dynamics of spatial and temporal population genetic structure of weedy rice (Oryza sativa f. spontanea Baker)
详细信息 查看全文
- 作者：Anupong Wongtamee ; Chanya Maneechote…
- 关键词：Gene flow ; Genetic diversity ; Population structure ; Spatial variation ; Temporal variation ; Weedy rice (Oryza sativa f. spontanea Baker)
- 刊名：Genetic Resources and Crop Evolution
- 出版年：2017
- 出版时间：January 2017
- 年：2017
- 卷：64
- 期：1
- 页码：23-39
- 全文大小：
- 刊物类别：Biomedical and Life Sciences
- 刊物主题：Plant Sciences; Plant Systematics/Taxonomy/Biogeography; Plant Genetics & Genomics; Plant Physiology; Agriculture;
- 出版者：Springer Netherlands
- ISSN：1573-5109
- 卷排序：64
文摘
Weedy rice (Oryza sativa f. spontanea Baker) is one of the most serious weeds in direct-seeded rice production; adversely affecting rice areas and yield in Thailand. The objectives of this study were to evaluate the level of morphological and agronomical variation and the level and pattern of genetic diversity and population structure of weedy rice populations in Thailand. Sixty-three weedy rice populations collected from three rice production areas of Thailand were sampled over four rice cultivation seasons to study phenotypic characteristics, genetic diversity and population structure. All analysis included comparison with seven cultivated rice varieties and seven local common wild rice populations. The results demonstrated considerable genetic and morphological variation, population structure, and changing dynamics of Thai weedy rice populations, both within and between regions and growing seasons. Phenotypic and genotypic variations and population structure of weedy rice populations changed temporally, with a trend over five years toward greater similarity to companion crop rice varieties. The ongoing gene flow, combined with ecological conditions created by farmers’ selection and agronomic practices, may enhance fitness and adaptability of weedy rice populations and stimulate the evolution of invasiveness in weedy rice plants. The adaptive evolution of weedy rice tended to parallel cultivated rice for high adaptation to the agronomic practices, possibly including selection for crop mimicry, which has led to the convergence of weedy populations phenotypically and genetically with the companion crop rice.