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Chinese Agricultural Science Bulletin ›› 2015, Vol. 31 ›› Issue (3): 29-34.doi: 10.11924/j.issn.1000-6850.2014-1809

Special Issue: 水稻

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Screening and Evaluation of the Drought Resistance Identification Indexes of Upland Rice Varieties During Seedling Stage

Xu Jianxin1,2,3, Yang Jie2, Hu Xiangwei3, Su Zihan3, Wang Yunyue3   

  1. (1Tropical 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, P.R.China, Danzhou Hainan 571737;2Zhanjiang Experimental Station, Chinese Academy of Tropical Agricultural Sciences/Tropical Dry Farming Research Center, Zhanjiang Guangdong 524013;3Yunnan Agricultural University/Ministry of Education Key Laboratory for Agrobiodiversity and Plant Disease Management, Kunming 650201)
  • Received:2014-06-29 Revised:2014-06-29 Accepted:2014-08-08 Online:2015-03-19 Published:2015-03-19

Abstract: 24 Yunnan upland rice varieties were used as experimental materials in screening out identification index of drought resistance of upland rice during seedling stage. The results of correlation analysis of relative value of various traits and survival percentage under repeated drought condition showed that relative value of the length of first leaf under the central leaf, the length of second leaf under the central leaf, the width of second leaf under the central leaf, root dry weight and root-shoot ratio were significantly or very significantly correlated with the survival percentage under repeated condition, and these five indexes could be used as the morphological indexes to identify the drought resistance. The drought resistance of 24 upland rice varieties was evaluated by regression equation and the results indicated that it was feasible to predict the drought resistance in rice during seedling stage using integrated identification index.