Studies on Improving Cucumber Chilling Resistance by Seedling Hardening

doi:10.3321/j.issn:1000-7091.1994.03.012

Abstract

Abstract: The physiological effects of cold hardening,drought hardening and abscisic acid(ABA)spraying on cucumber seedlings were studied,and the mechanism of plant cross-adaptation in stress was investigated.Three seedling treatments all improved the chilling resistance of cucumber seedlings and ABA content.The ABA content was significantly correlated with the chilling resistance.The peroxidase activity was significantly enhanced by cold hardening,and a new band of isoenzyme was found.The new band resulted from the translation of the mRNA which already existed in cells before hardening.Spraying 5-fluorouracil(5-FU)and DDTC during the hardening process reduced the effects of seedling hardening.Cold hardening and drought hardening of cucumber seedlings affected the balance of endogenous hormones in the plant,increased the content of osmosis-regufating substances and changed the enzyme system.

Key words: Cucumber, Seedling hardening, Chilling resisrance

CLC Number:

S642.204.3

Liu Mingchi. Studies on Improving Cucumber Chilling Resistance by Seedling Hardening[J]. ACTA AGRICULTURAE BOREALI-SINICA, 1994, 9(3): 52-58. doi: 10.3321/j.issn:1000-7091.1994.03.012.

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