摘要
在大气ＣＯ２体积分数为７００×１０－６条件下，对油桐和烟草的光合ＣＯ２同化速率、光呼吸１８Ｏ２吸收速率、光合色素、叶的脂类和脂肪酸组成等进行了比较分析．结果表明：大气ＣＯ２体积分数为７００×１０－６时油桐和烟草的光合速率有所增加，并抑制光呼吸１８Ｏ２的吸收，但是，油桐对ＣＯ２浓度升高比烟草敏感，它的光合速率在７００×１０－６ＣＯ２时增加了２倍，而光呼吸１８Ｏ２吸收则完全消失；油桐在７００×１０－６ＣＯ２下生长，光合色素合成量增加较多，其中叶绿素ｂ及类胡罗卜素等属于捕光色素系统的色素增加尤其明显，叶绿素ａ／ｂ值显著下降，在同样条件下，烟草的叶绿素含量还略有减少，类胡罗卜素含量则明显减少；高浓度ＣＯ２影响这两种植物叶的脂类和脂肪酸的组成，７００×１０－６ＣＯ２下生长的这两种植物叶的饱和脂肪酸和磷脂含量有所增加，但油桐叶的糖脂含量有所下降，烟草的糖脂含量则不受ＣＯ２浓度升高的影响．
It was compared that the rates of photosynthetic CO 2 assimilation and photorespiratory 18 O 2 uptake,compositions of lipids and its fatty acids in leaves of N.tabacum and A.montana grown under 700×10 -6 volume fraction CO 2 in air.The results showed that 700×10 -6 volume fraction CO 2 enhanced the rates of photosynthetic CO 2 assimilation and depressed photorespiratory 18 O 2 uptake. A.montana was more sensitive to the increasing of CO 2 in the air.Under 700×10 -6 volume fraction CO 2 the increasing of rate of CO 2 assimilation was more pronouncedly and the 18 O 2 uptake was deprived completely in the tree.At the same condition, N.tabacum still had more than 60% of 18 O 2 uptake remained comparing with the control.Higher contents of chlorophyll and carotenoids were found in A.montana under 700×10 -6 volume fraction CO 2.Chlorophyll b,which contributes to light harvesting complex of photosystems,was increased pronouncedly that lowed down the value of chlorophyll a/b of the tree under 700×10 -6 volume fraction CO 2.Whereas,under 700×10 -6 volume fraction CO 2 the contents of photosynthetic pigments remained unchanged or even somewhat decreased in tabacco.Higher CO 2 concentration in air effected the compositions of lipids and of its fatty acids.Growth under 700×10 -6 volume fraction CO 2,both plants produced more phospholipids. A.montana decreased content of glycolipids in the leaf and that of N.tabacum was not changed.Higher CO 2 also enhanced the proportion of saturated fatty acids and depressed that of unsaturated ones in the leaves under 700×10 -6 volume fraction CO 2.
出处
《中南林学院学报》
CSCD
1998年第3期17-22,共6页
Journal of Central South Forestry University
基金
国家自然科学基金
德国科学联合会(DFG)资助
关键词
大气
温室效应
光合性状
二氧化碳
油桐
烟草
CO 2 enrichment
Aleurites montana
Nicotiana tabacum
photosynthetic gas exchange
composition of lipids
