Welcome to Chinese Journal of Tropical Crops,

Chinese Journal of Tropical Crops ›› 2019, Vol. 40 ›› Issue (4): 693-700.DOI: 10.3969/j.issn.1000-2561.2019.04.011

• Phytophysiology and Biochemistry • Previous Articles     Next Articles

Comprehensive Evaluation of Heat Tolerance of Green Stem Pakchoi

CHEN Zhisheng1,TIAN Libo1,SHANG Sang1,*(),YANG Yan2,*(),LIU Ziji2,ZOU Kaixi1,ZENG Liping1   

  1. 1. Institute of Tropical Agriculture and Forestry, Hainan University, Haikou, Hainan 570228, China
    2. Tropical Crops Genetic Resources Institute, Chinese Academy of Tropical Agricultural Sciences / Key Laboratory of Crop Gene Resources and Germplasm Enhancement in Southern China, Ministry of Agriculture and Rural Affairs, Danzhou, Hainan 571737, China
  • Received:2018-10-15 Revised:2019-01-16 Online:2019-04-15 Published:2019-05-21
  • Contact: Sang SHANG,Yan YANG

Abstract:

The disease index and 15 physiological and biochemistry indexes of 19 green stem pakchoi cultivars were measured and analyzed by multivariate statistical analysis methods such as principal component analysis, cluster analysis and regression analysis to evaluate the genetic diversity of heat-resistance evaluation system of green stem pakchoi. The 15 indexes were grouped into 6 principal components with cumulative contributive rate 83.179% by principal component analysis. The varieties were divided into 3 categories based on cluster analysis of comprehensive evaluation of heat resistance would. Qing 11, Qing 16, Qing 13, Qing 9, Qing 18 were in the first category, Qing 19, Qing 4, Qing 7, Qing 5, Qing 14, Qing 12, Qing 15, Qing6, Qing 2 was in the second category, and Qing 10, Qing 8 Qing 1, Qing 3, Qing 17 was in the third category. The mathematical model for evaluating the heat tolerance of green stem pakchoi was established by stepwise regression analysis; D=-0.349-0.063×(RR)+0.163×(FW)+0.222×(SI)+0.394×(TC)+ 0.033×(AA)+0.137×(Pr)+0.159×(SS)-0.091×(CII). Combined with field identification results, Qing 13, Qing 11, Qing 9, Qing 16 and Qing 18 can be planted in Hainan in summer and autumn.

Key words: varieties of green stem pakchoi, high temperature stress, principal component analysis, cluster analysis