Selection and Comprehensive Evaluation of Cassava Cold-resistant Germplasm Resources and Identification Indexes
Welcome to Chinese Journal of Tropical Crops,

Chinese Journal of Tropical Crops ›› 2019, Vol. 40 ›› Issue (1): 1-10.DOI: 10.3969/j.issn.1000-2561.2019.01.001

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Selection and Comprehensive Evaluation of Cassava Cold-resistant Germplasm Resources and Identification Indexes

ZHANG Wei1,YI Tuo1,TANG Wei1,SONG Yong1,2,*()   

  1. 1. Horticulture and Landscape College of Hunan Agricultural University, Changsha, Hunan 410128, China
    2. Engineering Research Center of Potato, Changsha, Hunan 410128, China
  • Received:2018-07-21 Revised:2018-09-11 Online:2019-01-15 Published:2019-01-15
  • Contact: SONG Yong

Abstract:

The chilling injury of 18 cassava germplasm resources was classified by natural low temperature in the field. and strong cold-tolerant cultivars (F200), medium-tolerant cultivars (20-4, 52-3), and weak cold- tolerant cultivars (16P, SC8) were selected for low temperature (4 ℃) stress treatment. The seedling leaf relative electric conductivity, the malondialdehyde, soluble sugar, soluble protein, protective enzyme activity and other seven physiological indexes were assayed using the method of principal component analysis (PCA), and the membership function, correlation analysis and stepwise regression method were used to comprehensively assess the cold resistance and screen cold appraisal indicators. Seven single physiological indexes were converted into three independent comprehensive indexes, and it was considered that four physiological indexes including relative electrical conductivity, soluble sugar, malondialdehyde and CAT four physiological indexes could be used as the indexes to accurately and quickly identify the cold resistance of cassava. The evaluation system of cassava cold resistance was initially established, and the results of field and physiological tests were highly consistent. It was found that among the cassava germplasm tested, the most cold-resistant strain was F200 and the least cold-resistant strain was SC8.

Key words: cassava, hardiness, index selection, comprehensive evaluation