文献类型：期刊文献

中文题名：不同树龄侧柏接穗光合生理的比较研究

英文题名：Comparison on Photosynthetic Physiology in Various Age Scions of Platycladus orientalis

作者：倪妍妍[1] 常二梅[1] 刘建锋[1] 江泽平[1]

第一作者：倪妍妍

机构：[1]国家林业局林木培育重点实验室,中国林业科学研究院林业研究所,北京100091

年份：2017

卷号：32

期号：1

起止页码：19-24

中文期刊名：西北林学院学报

外文期刊名：Journal of Northwest Forestry University

收录：CSTPCD;;北大核心:【北大核心2014】；CSCD:【CSCD_E2017_2018】；

基金：国家自然科学基金项目“端粒相关基因对侧柏衰老的调控作用”(31300555);中央级公益性科研院所基本科研业务费专项资金项目“侧柏古树扦插生根机理研究”(RIF2014-11)

语种：中文

中文关键词：侧柏;衰老;光合作用;叶绿素荧光;叶绿素;非结构性碳水化合物

外文关键词：Platycladus orientalis ; aging; photosynthesis; chlorophyll fluorescence; chlorophyll content;non-structural carbohydrate

分类号：S791.38

摘要：以不同年龄侧柏母树(5、100、700a)的接穗为试验材料,将其嫁接于大小一致的侧柏幼树上,待成活后,光响应曲线参数、叶绿素荧光参数和非结构性碳水化合物含量的测定与分析,试图揭示光合物质生产能力与树木衰亡的关系。结果显示:1)在光响应参数方面,侧柏不同龄段接穗的最大净光合速率(Pmax)随着年龄的增加而下降,依次为3.92μmol CO_2·m^(-2)·s^(-1)(5a)、2.41μmol CO_2·m^(-2)·s^(-1)(100a)和2.18μmol CO_2·m^(-2)·s^(-1)(700a),且5a与700a差异显著(P<0.05);光饱和点(LSP)从低龄到高龄段亦呈下降趋势,但各年龄段间接穗表观量子效率(AQY)和光补偿点(LCP)差异不显著。2)叶绿素荧光参数方面,3个年龄段接穗在初始荧光(F_o)、最大荧光(F_m)、可变荧光(F_v)、非光化学猝灭系数(NPQ)、光化学猝灭系数(QP)等参数上均无显著差异,但光系统Ⅱ(PSⅡ)原初光能转换效率(F_v/F_m)和PSⅡ潜在活性(F_v/F_o)随年龄增加而呈现下降趋势。3)叶绿素色素含量及非结构性碳水化合物含量随年龄增加而呈现下降趋势。综上所述,随年龄增加,树木光合能力下降,进而导致碳供应能力降低可能是树木衰亡的重要原因之一。
In order to understand the relationship between the productivity of photosynthetic products and aging of Platycladus orientalis ,scions collected from trees with the ages of 5,100 ,and 700 years were graf- ted in the stocks the same age （5 a）. The photosynthetic characteristics,chlorophyll fluorescence parameters, and the contents of non-structural carbohydrates were measured after one-year growth. Our results showed that 1） for the light response parameters,no significant differences among various aged scions were detected. The Maximum photosynthetic rate （Pmax） and light saturation point （LSP） which both decreased with ages. P in scions from 5,100 and 700 a trees were 3.92,2.41 and 2.18 μmol CO2 · m^-2 ·s^-1 ,respectively. 2） For chlorophyll fluorescence parameters,only the primary conversion of light energy of photo-system Ⅱ （Fv/Fm）and potential activation of photo-system Ⅱ （Fv/Fo）exhibited downward trends with tree age. 3） The content of chlorophyll a, b, carotenoids, soluble sugars, and non-structural carbohydrates （NSC） in the 5 a scions were higher than those in 100 and 700 a. The above results showed that relatively young P. orientalis had higher photosynthetic potentials for substance accumulation. Consequently, we speculated that decreasing photosynthetic potential with tree age may be one of the main factors causing trees＇ aging or even dying.