摘要
[ Objective] The purpose was to discuss drought resistance mechanism of Chenopodium album L. and supply theoretical basis and practical guidance for artificial cultivation and popularization of C. album. [ Method] C. album seedlings grown to 6th leaf stage were conducted osmotic stress treatment with PEG6000 osmotic whose concentration was set up as 0, 5%, 10% and 20% and the various physiological indices of the 3rd -5th function leaves in upper plant were determined after being treated for 0, 1,3, 5, 7 and 9 d. [ Result] Under osmotic stress with 5% PGE, the relative water content （RWC） of C. album reduced less. Under osmotic stress with 10%, the RWC in seedling leaves of C. album decreased to 62% on the fifth day and the leaves began to wither. Under osmotic stress with 20%, the RWC in seedling leaves of C. album decreased to 61.9% on the third day and the leaves appeared withering, and the RWC decreased to 48.6% on the 7th day and the leaves were dry and yellow. Proline contents in seedling leaves of C. album under osmotic stress with 5%, 10% and 20% PEG were 7.64, 10.9 and 29.4 times of CK on the 7th day. [ Conclusion] C. album hed some adaptability to moderate osmotic stress, but the PEG osmotic stress with high concentration and long time might lead to severe damage on C. album.
[Objective] The purpose was to discuss drought resistance mechanism of Chenopodium album L.and supply theoretical basis and practical guidance for artificial cultivation and popularization of C.album.[Method] C.album seedlings grown to 6th leaf stage were conducted osmotic stress treatment with PEG6000 osmotic whose concentration was set up as 0,5%,10% and 20% and the various physiological indices of the 3rd-5th function leaves in upper plant were determined after being treated for 0,1,3,5,7 and 9 d.[Result] Under osmotic stress with 5% PGE,the relative water content(RWC)of C.album reduced less.Under osmotic stress with 10%,the RWC in seedling leaves of C.album decreased to 62% on the fifth day and the leaves began to wither.Under osmotic stress with 20%,the RWC in seedling leaves of C.album decreased to 61.9% on the third day and the leaves appeared withering,and the RWC decreased to 48.6% on the 7th day and the leaves were dry and yellow.Proline contents in seedling leaves of C.album under osmotic stress with 5%,10% and 20% PEG were 7.64,10.9 and 29.4 times of CK on the 7th day.[Conclusion] C.album had some adaptability to moderate osmotic stress,but the PEG osmotic stress with high concentration and long time might lead to severe damage on C.album.
基金
Supported by the Natural Science Foundation of Education Department of Jiangsu Province(02KJD18007)
the Key Laboratory Program of Bio-re-sources of Jiangsu Province(KJS03042)
the Key Program of Natural Science Foundation of Xuzhou Normal University(06XLA11)~~
