Acta Horticulturae Sinica ›› 2021, Vol. 48 ›› Issue (11): 2239-2250.doi: 10.16420/j.issn.0513-353x.2020-0904

• Original article • Previous Articles     Next Articles

Screening for Genetic Variation in Photosynthesis and High Photosynthetic Efficiency Germplasm in Potato

XU Guochun, LUO Wenbin, LI Huawei, XU Yongqing, JI Rongchang, ZHANG Hong, QIU Sixin, TANG Hao()   

  1. Scientific Observing and Experimental Station of Tuber and Root Crops in South China,Ministry of Agriculture and Rural Affairs,Fujian Engineering Research Center for Characteristic Upland Crops Breeding,Crop Research Institute,Fujian Academy of Agricultural Sciences,Fuzhou 350013,China
  • Received:2021-04-21 Revised:2021-05-26 Published:2021-12-02
  • Contact: TANG Hao


Twenty-four potato germplasms from different geographical regions were used to measure leaf gas exchange,instantaneous carboxylation efficiency(CE),stomatal limitation value(Ls),intrinsic water use efficiency(iWUE)and chlorophyll content(SPAD)of potato. Correlation analysis,principal component analysis and cluster analysis were combined to evaluate the genetic variation and screen high photosynthetic efficiency germplasm of tested materials. The results showed that,significant variation in all photosynthetic traits were observed among 24 germplasms,the coefficient of variation ranging from 8.42% to 25.21%,and more obviously variation in stomatal conductance(Gs),transpiration rate(Tr),Ls and iWUE were found,suggesting a promising opportunity for selection of greater photosynthetic efficiency in potato. Analysis of broad-sense heritability(h2)showed that,the h2 of photosynthetic traits varied from 11.95% to 83.69%,six traits had a high level of heritability,whose h2 were exceeded 60%,and the highest heritability was observed in SPAD(83.69%). Principal component and cluster analysis revealed that,twenty-four germplasms were divided into three photosynthetic efficiency groups,and screened out eight germplasm with relatively higher photosynthetic efficiency,including‘Minshu 4’,‘Minshu 7’,‘Yunshu 108’,‘Yunshu 109’,‘Tianshu 10’,‘Longshu 7’,‘N210’and‘Longshu 9’. These germplasms can be used as genetic resources for the photosynthetic mechanism research and high photosynthetic efficiency breeding. In addition,the SPAD was significantly and positively correlated with comprehensive evaluation value of photosynthetic efficiency,so SPAD could be used as an early screening indicators of photosynthetic efficiency in potato germplasms.

Key words: potato, photosynthetic efficiency, genetic variation, germplasms screening, SPAD

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