摘要
研究了长白山红松遮荫苗、全光苗及大幼树一年生针叶越冬期间PSⅡ电子传递活性,叶绿素、类胡萝卜素含量、超氧物歧化酶活性及同工酶谱的变化,以阐明红松大幼树防止越冬光氧化伤害的部分内在机制。研究表明红松大幼树越冬期间PSⅡ电子传递活性的受抑制程度不亚于全光下的幼苗,但秋天积累的叶绿素较多,冬天超氧物歧化酶活性及类胡萝卜素含量均明显高于全光苗,为针叶提供了有效的保护。研究还表明,红松针叶在土壤冻结期间也具有合成这些物质的能力。未发现大幼树SOD同工酶谱和幼苗的质的区别。讨论了SOD在树木抗冻性中可能具有的作用。
PS Ⅱ electron transport activities, chlorophyll and carotenoids content, SOD activities and isozymograms of needles from shaded and exposed seedlings and trees were monitored on Changbai Mountains during winter 1987-1985 to illustrate the internal protective mechanism of Korean pine (Pinus koraiensis Sieb. et Zucc.) trees against winter photo-oxidation damage. The results show that the inhibition of photosynthetic capacity measured as PS Ⅱ electron transport rates are nearly as deep as solarexposed seedlings, but trees accumulated more chlorophyll and carotenoids in autumn can maintain higher contents in winter. SOD activities show higher activities in trees than those in solar-exposed seedlings as well. However, no extra isozyme bands are showed for trees. The data indicate that the mentioned substances may be synthesized by needles during soil frozen period. The possible role of SOD as free-radical scavenger in cold resistance is discussed.
出处
《林业科学》
EI
CAS
CSCD
北大核心
1990年第4期289-293,共5页
Scientia Silvae Sinicae
基金
国家科学基金资助课题
关键词
红松
树苗
幼树
电子传递
歧化酶
PSⅡ
Photosynthetic electron transport
SOD
Photooxidation
Freezing resistance
Pinus koraiensis.
