2011•Shanxi nongye daxue xuebao. Ziran kexue banRequires access
Effect of Cold-hardening at the Survival Threshold Low Temperature on Activities of POD and Chilling Tolerance of Cotton Seedlings
LI Sheng-quan
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Abstract
In order to research the effect of cold-hardening at the survival threshould low temperature on chilling tolerance of cotton seedlings,the cotton seedlings had been acclimatized at different low temperature(12 ℃,14 ℃,16 ℃) and chilling stress at 4 ℃ for 7 days.Then the peroxidase(POD) activities and the malondialdehyde(MDA) contents of cotton seedlings that theyare related to the chilling tolerance of cotton seedlings were determined,and the possible mechanism was discussed.The results showed that the peroxidase(POD) activity of cotton seedlings was increased in varying degrees and the malondialdehyde(MDA) content was distintly decreased in all treatments cotton seedlings than the corresponding contrasts.Among which the acclimating temperature at 12 ℃ was beneficial preferably.Therefore,the tolerance of cotton seedlings to the chilling stress at 4 ℃ could be improved after acclimation at the survival threshold low temperature(12 ℃) because of the increased POD activity of cotton seedlings,decreased MDA content and the stabe membrane structure.