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Morphological characteristics of homozygous wild rice phytoliths and their significance in the study of rice origins

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Science China Earth Sciences 2022年第1期65卷 107-117页

作者： Xiangan TANG Houyuan LU Zhibin CAO Jinshui XIE School of Agriculture Sciences Jiangxi Agricultural UniversityNanchang 330045China Key Laboratory of Cenozoic Geology and Environment Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China Jiangxi Academy of Agricultural Sciences Nanchang 330200China

The analysis of wild rice cell structures,tissues,organs,and other morphological characteristics and the development of identification markers for wild rice are the basis for identifying the origins and evolution of prehistorical rice ***,contemporary wild rice strains are often subject to gene introgression from domesticated rice cultivated by humans during the evolutionary process,which may affect the accuracy of wild rice identification *** means that how to eliminate the effects of gene introgression from domesticated rice and other plants on the identification of origin markers,and the purification of the morphological characteristics of wild rice have become critical in research to identify the origin of *** this study,we compared and analysed the phytolith morphologies of three common wild rice species(Oryza rufipogon Griff.)from various habitats and one species of ectopically preserved homozygous common wild rice after six consecutive generations of *** found that the morphology of the bulliform phytolith in the homozygous wild rice with reduced domestication gene introgression had three significant differences compared with native wild rice:(1)an overall reduction in size(body length decreased from 41.9μm in VLnativeto 38.6μm in VLhomozygous);(2)an increase in the proportion of the long-stalked phenotype,with the ratio of B/A decreasing from 1.22±0.47 in B/Anativeto 0.92±0.30 in B/Ahomozygous;and(3)a decrease in the number of fish-scale decorations,with the proportion of bulliform phytoliths with≥9 fish-scale decorations reduced from 53.4%in native wild rice to 37.2%in homozygous wild ***,this study provides a reliable reference for the identification of rice origins using rice phytolith morphology.

关键词： Dongxiang wild rice Common wild rice Bulliform phytolith homozygous lineage Native habitats Rice origins

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