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ACTA HORTICULTURAE SINICA ›› 2009, Vol. 36 ›› Issue (1): 81-86.

• 观赏植物 • Previous Articles     Next Articles

Semilethal Temperature of Fingered Citrons(Citrus medica var. sarcodactylis Swingle) under Low Temperature Stress and Evaluation on Their Cold Resistance

GUO Wei-dong*, ZHANG Zhen-zhen, JIANG Xiao-wei, CHEN Min-guan , ZHENG Jian-shu, and CHEN Wen-rong   

  1. ( College of Chemistry and Life Science, Zhejiang Normol University, Jinhua, Zhejiang 321004, China )
  • Received:2008-05-09 Revised:2008-12-10 Online:2009-01-25 Published:2009-01-25
  • Contact: GUO Wei-dong

Abstract:

The semilethal temperatures (LT50) of two cultivars of fingered citrons (Citrus medica var. sarcodactylis Swingle), C. medica 'Qingpi' and C. medica 'Aihua', were calculated and their resistance to low temperature stress were evaluated. The relative electric conductivity (REC) in leaves of the two cultivars were determined and their semilethal temperatures (LT50) were determined after the plants had been treated under a series of low temperatures for 24 h. Then the REC, superoxide dismutase (SOD) activity, the malondialdehyde (MDA) and free proline (Pro) contents were analyzed under LT50 after a serial treatment period. The results showed that the REC of the both cultivars increased following an S-curve with temperature drop and treatment length and the LT50 was between - 4 and - 5℃. The activity of SOD increased at the beginning of cold treatment at LT50 then decreased afterwards. Concentrations of MDA and the Pro gradually increased with time of low temperature exposure. 12~ 24 h was considered to be a critical period for cold injury of C. medica under the LT50.

Key words: fingered citron, Citrus medica var. sarcodactylis Swingle, relative electric conductivity, semilethal temperature, superoxide dismutase, free proline, malondialdehyde

CLC Number: