沈阳五种针叶树的抗冻性、色素与超氧物歧化酶

FREEZING TOLERANCE,PIGMENTS AND SOD OF FIVE CONIFERS IN SHENYANG

研究了沈阳市内栽培的红皮云杉(Picea koraiensis Nakai)、樟子松(Pinus sylvestrisvar.mongolica Litvin)、红松(P.koraiensis Sieb.et Zuce)、油松(P.tabulaeformisCarr.)、白皮松(P.bungeana Zucc.)越冬期间叶绿素、类胡萝卜素含量、超氧物歧化酶(SOD)酶活性及其同工酶谱的变化与耐冻性之间的关系。结果表明,越冬期间叶绿素有不同程度的降解,而类胡萝卜素甚至在土壤冻结期间也继续有净的合成。7—11月5种针叶树 SOD 活性均明显增加,在冬季越是耐冻的树种,其 SOD 活性越高。这表明 SOD 除有防止针叶越冬光氧化伤害的作用外,对针叶的耐冻性可能有重要作用。不同树种 SOD 同工酶谱的变化也有些差别,但尚难以做出概括性的结论。

Cultivated Picea koraiensis Nakai,Pinus sylvesris var.mongolica Litvin,P.koraiensis Sieb et Zuce,P.tabulaeformis Carr.and P.bungeana Zucc.were studied.Changes in chloro- phylls carotenoids contents,SOD activities and iso-zymograms were monitored for the needles of the 5 evergreen conifers and related to their fieezing tolerance during winter of 1987—1988 in Shenyang.It shows that the chlorophylls were degradated to various extent in the winter while the carotenoids were still synthesized during the soil-frozen period.SOD activities in- creased from July to November for all 5 conifers and the more tolerate the species, the higher the SOD activities during winter.The results suggest that SOD possibly has important con- tribution to freezing tolerance besides protecting the needles from winter photooxidation.SOD iso-zymograms and their variation showed differance among species as well,but it is hard to drav,a generalized conclussion.