黑杨杂交无性系间叶片δ^(13)C、长期水分利用效率和光合特性的研究  

Differences among the Leaf δ^(13)C,Long-Term Water Use Efficiencies and Photosynthetic Capabilities of Different Populus deltoides Clones

作　　者：赵凤君[1] 沈应柏[1] 高荣孚[1] 苏晓华[2] 张冰玉[2] 

机构地区：[1]北京林业大学生物科学与技术学院,北京100083 [2]中国林业科学研究院林业研究所,北京100091

出　　处：《西北植物学报》2005年第11期2250-2258,共9页Acta Botanica Boreali-Occidentalia Sinica

基　　金：国家高技术研究发展计划"863"课题(2002AA241071和2002AA2Z4011)

摘　　要：在温室中通过严格控水的方法,对4个不同水分处理下,12个黑杨杂交无性系间长期水分利用效率(WUEL)、1δ3C和光合参数(Gs、Tr、Pn、WUEi、Ci、Pm ax、LSP、C e)的差异进行了研究,并分析了无性系间WUEL和δ13C差异与光合参数差异的相互关系.结果表明:不同水分处理下,δ13C和Gs、Tr、Pn、WUEi、Ci差异极显著.随水分胁迫的加剧,δ13C和WUEi增加,而Gs、Tr、Pn、Ci减少.同一水分处理下无性系间WUEL和1δ3C差异显著,Gs、Tr、Pn、WUEi、Ci差异极显著.无性系间WUEL和δ13C的差异在4个水分处理下表现出一致性,即WUEL最优的是J2,其次为J6、J7、J8、J9,同时这些无性系的1δ3C较高.Gs是影响WUEi的关键因子,Gs低的无性系WUEi高.J2、J6、J7、J8、J9的净光合速率(Pn)和瞬时水分利用效率(WUEi)虽不是最高,但其最大净光合速率(Pm ax)大,光饱和点(LSP)高,羧化效率(C e)大,光合能力强.无性系间1δ3C和WUEL差异的主要影响因子是Gs和光合能力,J2、J6、J7、J8、J9都具有Gs低和光合能力强的特点.各水分处理下1δ3C与WUEL均呈正相关,但由于水分引起的δ13C差异远大于无性系间的差异,因此二者的相关性仅在充分供水条件下表现较好,相关系数为0.707 7.With accurate water control .the differences among the long-term water use efficiencies.δ^13C.and photosynthetic parameters （Gs. 7r. Pn. WUEi. Ci. Pmax、 LSP、 Ce） of different Populus deltoides clones in four different water treatments were studied in greenhouse and then the relations between these differences were analyzed. The results showed that the δ^13C.Gs.Tr.Pn.WUEi and Ci significantly differed among the water treatments. With intensified water stress.the δ^13C and WUE increased and Gs.Tr.Pn.WUEi and Ci decreased. In the same water treatments the clones significantly differed in δ^13C and WUEL but showed no significant differences in Gs.7r.Pn.WUEi and C. The δ^13C and WUEL differences of the clones presented a consistent pattern in the four water treatments,i, e. the highest WUEI. appeared in J2 and the WUEc next to the highest WUEc occurred in L6,J7,J8, and J9,while these clones showed a higher δ^13C. The G, was the key factor of affecting the water use efficiencies,the clones with high Gs having high WUEL. Although J2,J6,J7, J8 and J9 did not present the highest net photosynthetic rate and the highest instant WUEi,their maximum net photosynthetic rates （Pmax） and light saturated points （LSP） and carboxylation efficiencies （Cr） and photosynthetic capabilities were higher. The major factors affecting the δ^13C and WUEc differences of the clones were the Gs, and the photosynthetic capabilities ,and J2,J6,J7,J8 and J9 all had low Gs and high photosynthetic capabilities. In different water treatments ,the δ^13C and WUEI. appeared to positively correlate ,but this correlation only worked well with its coefficient standing at 0. 707 7 under sufficient water supply be- cause the δ^13C differences resulting from water stress were much bigger than those among the clones.

关 键 词：Δ^13C 长期水分利用效率(WUEL) 光合作用 黑杨 无性系 

分 类 号：Q945.11[生物学—植物学]