8份木薯二倍体及其同源四倍体资源部分表型性状鉴定与分析

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Abstract： Polyploid breeding is an important way to innovate cassava germplasms. In order to explore the effects of cassva polyploidization on plant phenotype，plant growth potential，and photosynthesis-related physiological indicators，weanalyzed 28quality traits and18 quantitative traitsof 8cassava Varieties and their corresponding induced autotetraploid resources.The results showed that 8 cassava varieties showed differences in 40 phenotypic traits.The leafcenter leaflet shape traits were significantly diferent between the diploid varieties and their autotetraploid resources.The majority of autotetraploid resources shows reduced ratio of lobe length to lobe width of central leaf lobe，shortened plant height，and reduced number of root tubers compared with corresponding diploids . Only the roots weight per plant of Xinxuan 048 and South China No.12 autotetraploids increased significantly，and the dry mater content of Nanzhi199 and South China No.14 autotetraploids increased significantly.A survey of plant growth potential indicators found that most of the autotetraploid varieties have significantly lower plant height than diploids.And most of the autotetraploids have lower leaf numbers than the corresponding diploids during the same period，and reach the highest leaf holdings from late

August to early October.The efect of chromosome doubling on the stem diameter ofeach variety is not obvious. The net photosynthetic rate of8 varieties all shows significantly higher rate in autotetraploidsthan diploids.This studyclarified the phenotypic diferences，growth and development characteristics between diploids and autotetraploids of 8 varieties，analyzed the impact and occurrence rules of chromosome doubling on plants，and provided materials and theoretical basis for cassava polyploidy research.

Key words： autotetraploid cassava; phenotypic traits ; growth vigor; photosynthetic rate

木薯（ManihotesculentaCrantz）是大戟科木薯属植物，是世界三大薯类作物之一，全球第六大粮食作物。（剩余11140字）