Genetic divergence of weedy rice populations associated with their geographic location and coexisting conspecific crop: Implications on adaptive evolution of agricultural weeds
Genetic divergence of weedy rice populations associated with their geographic location and coexisting conspecific crop: Implications on adaptive evolution of agricultural weeds
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杂草稻种群的遗传分化与其地理位置和共存同种作物相关：对农业杂草适应性进化的影响
DOI：
10.1111/jse.12152
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发表时间：
2015-07-01
影响因子：
3.7
通讯作者：
Lu, Bao-Rong
中科院分区：
文献类型：
--
作者：
Song, Zhuo-Jun;Wang, Zhe;Lu, Bao-Rong
杂草稻，与栽培稻相同的生物物种，是一种危害世界各地稻田的有害杂草。为明确我国杂草稻的遗传多样性、结构和亲缘关系，以粳稻和籼稻品种为参照，应用插入/缺失（InDel）分子指纹技术对东北至南方稻区杂草稻群体进行了分析。14个杂草稻群体的240份样品的InDel指纹图谱显示了较高的遗传多样性（He = 0.42）。然而，检测到的种群内多样性要低得多，特别是中国东北和南方的种群，He值范围为0.006至0.06。江苏居群内遗传多样性指数（He = 0.12-0.31）显著高于其他地区。分子方差和Fst分析表明，杂草稻群体间的遗传变异高达88%。主成分和结构分析表明杂草稻群体存在明显的粳稻-籼稻遗传分化。江苏省杂草稻甚至在群体内也发生了籼粳分化，这可能是由于该地区的籼稻品种被粳稻品种取代。中国杂草稻群体间存在明显的遗传分化，这与其地理位置和共存的水稻品种有关。栽培稻的渗入在受人类影响的农业生态系统中形成杂草稻种群的遗传多样性和结构方面具有关键作用。
Weedy rice, the same biological species of cultivated rice, is a noxious weed that infests rice fields worldwide. To determine the genetic diversity, structure, and relationships of weedy rice in China, we applied insertion/deletion (InDel) molecular fingerprints to analyze weedy rice populations from northeastern to southern rice planting regions, using japonica and indica rice cultivars as references. The InDel fingerprints indicated relatively high overall genetic diversity (He = 0.42) for the 240 samples from 14 weedy rice populations. However, much lower within‐population diversity was detected, particularly for populations from northeastern and southern China, with the He value ranging from 0.006 to 0.06. Jiangsu populations showed much higher within‐population genetic diversity (He = 0.12–0.31) than those from other regions. Analysis of molecular variance and Fst showed ∼88% genetic variation among weedy rice populations. Principal component and structure analyses indicated substantial japonica–indica genetic differentiation of weedy rice populations. Weedy rice from Jiangsu province was undergoing indica–japonica differentiation even within populations, which was likely due to the replacement of indica by japonica rice varieties in this region. In conclusion, significant genetic divergence has taken place among weedy rice populations in China, which is associated with their geographic locations and coexisting rice varieties. Introgression from cultivated rice has a critical role in shaping the genetic diversity and structure of weedy rice populations in agro‐ecosystems influenced by humans.