干旱区研究

Arid Zone Research ›› 2018, Vol. 35 ›› Issue (3): 735-742.doi: 10.13866/j.azr.2018.03.29

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Physiological Response and Drought Resistance of Seed Watermelons in Dry Sandy Land

YANG Yu-miao1, JIANG Zhi-rong1, AN Li2   

  1. 1. College of Forestry,Gansu Agricultural University,Lanzhou 730070,Gansu,China;
    2. College of Horticulture,Gansu Agriculture University,Lanzhou 730070,Gansu,China
  • Received:2017-09-13 Revised:2018-01-05 Online:2018-05-15 Published:2025-11-17

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Abstract: In this study,an experiment about breeding the new variety “Heifeng 1” and the major local variety “Jingyuan Daban” was carried out so as to enrich the study on the physiological and ecological aspects of seed watermelons and provide the scientific basis for the local introduction of the new variety.In addition,the atmospheric drought method was used to simulate drought stress with ethephon as a desiccant at 7 concentration levels,and the 6 physiological indexes of 2 kinds of seed watermelons were measured and analyzed.The results are as follows: ① The cell relative permeability,MDA content and Pro content of 2 kinds of seed watermelons were increased with the aggravation of drought stress,while the CHL content was decreased.The activities of SOD and POD were increased at first and then decreased; ② The chlorophyll a/b ratios of 2 kinds of seed watermelons were higher than 1 under all the drought stress levels,so it could be determined that both kinds of seed watermelons are sun plants,and Jingyuan County is rich in sunshine which is advantageous for the growth of seed watermelons; ③ Under the drought stress of 300-500 mg·L-1 concentration,6 physiological indexes of drought resistance were changed obviously,which revealed that the response of both kinds of seed watermelons to this concentration is the most sensitive.Moreover,the ethephon concentration for ripening seed watermelons is 100-300 mg·L-1.It should be paid great attention to that ethephon is sprayed on fruits when ripening and on the leaves when stressing drought; ④ The principal component analysis and subordinate function analysis revealed that the drought tolerance of “Heifeng 1” was stronger than that of “Jinyuan Daban”.Under the same drought stress,the osmotic regulation capability and water-retaining property of “Heifeng 1” were high,and it was feasible to introduce and widely plant in Jingyuan County.

Key words: seed watermelon, ethephon stress, drought resistance, principal component analysis, membership function analysis, grey correlation analysis