期刊
BIOLOGIA PLANTARUM
卷 53, 期 2, 页码 278-284出版社
ACAD SCIENCES CZECH REPUBLIC, INST EXPERIMENTAL BOTANY
DOI: 10.1007/s10535-009-0051-x
关键词
air humidity; chilling stress; chlorophyll fluorescence; elevated CO2; photosynthesis; Zea mays
资金
- Polish State Committee for Scientific Research (KBN) [5P06B02012]
In pot experiments performed on maize seedlings chilled at 5 A degrees C, leaf injury was diminished by the application of elevated temperature (1 or 5 h at 15 or 20A degrees C, warm breaks treatment) in a dose-dependent manner. The lower the injury count, the higher the catalase (CAT) activity. In a separate experiment, the application of 100 % relative humidity also protected the plants from chilling injury and water loss, increased their gas exchange and variable to maximum chlorophyll fluorescence ratio (F-v/F-m), but did not influence CAT activity. Another protective environmental factor, elevated atmospheric CO2 concentration [700 A mu mol(CO2) mol(-1)(air)] diminished CAT activity inhibition, but only in plants of chilling-resistant cultivar. The positive impact of specific environmental factors accompanying chilling is not obviously related to the suppression of the inhibition of CAT activity, although the enzyme is considered as chilling-sensitive.
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