Cold Tolerance Identification of New Potato Variety ‘Minshu No.2’ in Winter Cropping Area of Southern China
LUO Wenbin，LI Huawei，XU Guochun，LIN Zhijian，JI Rongchang，XU Yongqing，QIU Sixin，TANG Hao*
Crop Research Institute，Fujian Academy of Agricultural Sciences，Scientific Observing and Experimental Station of Tuber and Root Crops in South China，Ministry of Agriculture，Technical Research Center of Specialty Day Crop Variety Breeding of Fujian，Fuzhou 350013，Fujian，China
Abstract：In order to identify and evaluate the cold tolerance of new potato variety ‘Minshu No.2’，this paper took ‘Minshu No.2’ and ‘Favorita’（CK）as test materials；adopted conductivity and field natural frost methods to measure the semi-lethal temperature（LT50）of in vitro leaf before and after cold acclimation，plant damage grade before and after frost，moephological chacteristics and leaf microbial diversity index．The results showed that the LT50 of ‘Minshu No.2’ before and after cold acclimation were remarkably lower than that of‘ Favorita’．The damage grade of‘ Minshu No.2’ was significantly lower than that of‘ Favorita’ after low temperature frost．After frost，the changes in leaf tissue microorganism of ‘Minshu No.2’ were smaller than in‘ Favorita’．Summing up the above，‘Minshu No.2’ had stronger cold tolerance than‘ Favorita’．It is suggested to extend its plantation in potato winter planting area of southern China．
