摘要
利用Lico-6400便携式光合测定仪,研究了30个毛白杨无性系光合指标的变化,并对环境因子与光合指标相关关系进行了探讨。结果表明:毛白杨无性系的净光合速率(Pn)、气孔导度(Gs)、蒸腾速率(Tr)日变化均呈典型双峰曲线,气孔限制是出现"午休"现象的主要调节因素,胞间CO2浓度(Ci)日变化曲线呈典型的"V"字型。5个毛白杨无性系的光合-光强(Pn-Par)响应曲线、光合-二氧化碳响应曲线(Pn-Ca)均呈"S"型,且符合2次曲线模型,饱和光强下5个毛白杨无性系瞬时Pn的排序为:BL204(24.64μmol.m-2.s-1)>BL206(23.76μmol.m-2.s-1)>BL30(21.50μmol.m-2.s-1)>BL207(19.54μmol.m-2.s-1)>BL63(18.64μmol.m-2.s-1)。饱和Par和Ca条件下,无性系BL206瞬时Pn最大,达30.15μmol.m-2.s-1,无性系BL63最小,只有20.34μmol.m-2.s-1。5个毛白杨无性系光补偿点(lcp)和二氧化碳补偿点(ccp)差异显著,lcp变化范围为33.08 81.17μmol.m-2.s-1,ccp变化范围74.03 93.35μmol.mol-1。30个毛白杨无性系间瞬时光合指标Pn、Gs、Ci和Tr的差异均显著(Sig<0.000),各光合指标变异系数为8.94%23.22%,遗传变异系数为8.78%22.79%,重复力高,遗传因素在表型变异中起主要作用;毛白杨光合指标之间存在极显著相关,最高相关系数达0.731。
The photosynthetic characteristics of 30 Populus tomentosa clones were measured with lico-6400 photosynthetic instrument,and the relationship between the environmental factors and physiological indicators was studied by correlation analysis and stepwise regression equation.The results showed that the diurnal net photosynthesis rate（Pn） variation of P.tomentosa clones presented a typical double-peak curve,and that stomatal limitation was a major regulatory factor of decreased photosynthesis.The Pn-Par（photosynthetically active radiation） and Pn-Ca（CO2-response） curves of five P.tomentosa clones shaped like ＂S＂,and also accorded with quadratic equation.Under saturated conditions of the Ca and luminous intensity,the Pn,light compensation point（lcp）,and CO2 compensation point（ccp） of five selected clones showed significant differences.In addition,with the luminous intensity saturated,the Pn rankings of the 5 clones were： BL204（24.64）BL206（23.76）BL30（21.50）BL207（19.54）BL63（18.64 μmol·m-2·s-1）.Whereas with the Ca saturated,BL206 had the maximum value（30.15 μmol·m-2·s-1）,and BL63 had the minimum value（0.34 μmol·m-2·s-1）.Meanwhile,for the five clones,the lcp ranged from 33.08 μmol·m-2·s-1 to 81.17 μmol·m-2·s-1,and ccp ranged from 74.03 μmol·mol-1 to 93.35 μmol·mol-1.The values of Pn,stomatal conductance（Gs）,intercellular CO2 concentration（Ci） and transpiration rate（Tr） of 30 poplar clones were significantly different（Sig0.000）.The results also presented that the phenotype variation coefficients of photosynthetic factors changed between 8.94%-23.22%,and genetic variation coefficients of photosynthetic factors were between 8.78%-22.79%.And the high repeatability revealed that genetic factors played a major role in phenotypic variation.Furthermore,there existed extremely significant correlations among the photosynthetic factors of the poplar clones,the highest correlation coefficient being 0.731.It is concluded that the photosynthetic i
出处
《林业科学研究》
CSCD
北大核心
2011年第3期370-378,共9页
Forest Research
基金
“十一五”国家科技支撑课题(2006BAD01A15-02)资助
关键词
毛白杨
无性系
净光合速率
变异
Populus tomentosa
clone
photosynthetic rate
variation
