Acta Agriculturae Boreali-Sinica

ACTA AGRICULTURAE BOREALI-SINICA ›› 2003, Vol. 18 ›› Issue (4): 31-34. doi: 10.3321/j.issn:1000-7091.2003.04.009

Special Issue: Cucumber；

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Influence of Critical Low Temperature and Poor Light on Photosynthesis Characters and Enzyme Variance of Cucumber

CHEN Qing-jun1, ZHANG Fu-man1, WANG Yong-jian2, ZHANG Hai-ying2, ZHANG Feng2, ZHANG Li-rong2   

  1. 1. College of Horticultural Science, CAU, Beijing100094, China;
    2. Beijing Vegetable Research Center, Beijing100089, China
  • Received:2003-03-20 Published:2003-12-28

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Abstract: Under 4 days continuous critical low temperature(day/night 15 ℃/8 ℃),critical low temperature and poor light condition,the photosynthetic characters and the enzyme variance of cucumber were tested.The results indicated that under critical low temperature the content of chlorophyll,chlorophyll fluorescence quantum yield and photosynthetic rate decreased remarkably. But under critical low temperature and poor light condition, the chlorophyll fluorescence quantum yield increased, the rate of chlorophyll content decreased slowly, the M peak reflecting the enzyme activity of carbon-assimilation weakened and the RuBP activity increased after decreased obviously. During the process of treatment the electrolyte leakage rate decreased.After 4 days treatment the light saturated point decreased remarkably. The temperature-photosynthetic rate curve indicated that the optical temperature of photosynthetic has good adaptation ability to low temperature.The variety of XinTaiMiCi showed good tolerance ability to low temperature among tested varieties.

Key words: Critical low temperature, Poor light, Photosynthesis characters, Enzyme variance

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CHEN Qing-jun, ZHANG Fu-man, WANG Yong-jian, ZHANG Hai-ying, ZHANG Feng, ZHANG Li-rong. Influence of Critical Low Temperature and Poor Light on Photosynthesis Characters and Enzyme Variance of Cucumber[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2003, 18(4): 31-34. doi: 10.3321/j.issn:1000-7091.2003.04.009.

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