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JOURNAL OF DESERT RESEARCH ›› 2016, Vol. 36 ›› Issue (4): 1041-1049.DOI: 10.7522/j.issn.1000-694X.2016.00047

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Drought Resistance of Different Ploidy Potato Varieties

Yang Hongyu1,2,3, Ping Haitao1,3, Wang Di1,3,4, Wang Li1,3,5, Liu Yuhui1,3, Bai Jiangping1,3,4, Yu Bin1,3, Zhang Junlian1,2,3   

  1. 1. Gansu Key Laboratory of Crop Genetic &Germplasm Enhancement, Gansu Agricultural University, Lanzhou 730070, China;
    2. College of Horticulture,Gansu Agricultural University, Gansu Agricultural University, Lanzhou 730070, China;
    3. Gansu Provincial Key Lab of Aridland Crop Science, Gansu Agricultural University, Lanzhou 730070, China;
    4. College of Agronomic,Gansu Agricultural University, Gansu Agricultural University, Lanzhou 730070, China;
    5. College of Life Sciences and Technology, Gansu Agricultural University, Lanzhou 730070, China
  • Received:2016-01-05 Revised:2016-03-25 Online:2016-07-20 Published:2016-07-20

Abstract: In order to extract the quality from different ploidy potato varieties of droughtresistance and on this basis to provide basis for further screening of drought resistance genes, the drought resistance of six varieties of potatoes "Longshu-3", (tetraploid) "Atlantic" (tetraploid), "2-27" (Diploid), "Solanumphureja" (Diploid), "03129-488" (hexaploid) and "03120-565" (hexaploid) were investigated by sand culture experiment. Simulated drought stress with 10% PEG (6000) treated different varieties of potato seedlings, after 0, 24, 48 and 72 h, some physiological and biochemical indexes related to drought resistance were measured. The drought resistance coefficient of potato varieties shape as a measure of each single index of drought resistance capacity, and using principal component analysis, membership function evaluation method, comprehensive evaluation method, the clustering analysis of potato drought resistance were evaluated. The results showed that the soluble sugar content and SOD activity of six varieties of potatoes had a positive correlation with drought stress time (R2=0.87,0.92), and high negative correlation between soluble sugar and SOD. In addition, the chlorophyll change trend of "Atlantic" and "Solanumphureja" were different from potato cultivars and negatively related to drought stress time which were markedly decreased by 6.06% and 11.85% compared with the contrast. Besides, the root activity of "Longshu-3" was highest under the condition of stress 72 h, while the "03129-488" and "2-27" after drought stress was lower than that of contrast by 78.26% and 52.17%. Compared with "Longshu-3" and "03120-565", the proline content of other four varieties were negatively related with the stress time, and had decreased in varying degrees with a drop of 26.48%-54.98% as the extension of processing time .The results of comprehensive evaluation was"Longshu-3"> "2-27"> "03129-488"> "Atlantic"> "Solanumphureja"> "03120-565". Stronger resistance to comprehensive evaluation results can truthfully reaction of tetraploid drought-resistant characteristics of "Longshu3".Diploid "2-27" and hexaploid "03129-488" drought resistance is also stronger than contrast "Atlantic", based on the excavation of the drought resistance related genes. The comprehensive evaluation can reflect the relationship between reaction of physiological index and drought resistance of potato. The aim is to provide the theoretical basis for the selection of drought tolerant potato in arid and semi-arid regions.

Key words: potato, drought resistance, principal component analysis, subordinate function, comprehensive evaluation

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