Photosynthesis, water use efficiency and stable carbon isotope composition are associated with anatomical properties of leaf and xylem in six poplar species
Photosynthesis, water use efficiency and stable carbon isotope composition are associated with anatomical properties of leaf and xylem in six poplar species
复制标题
光合作用、水分利用效率和稳定碳同位素组成与六种杨树叶片和木质部的解剖特性有关
DOI：
10.1111/j.1438-8677.2011.00531.x
复制
发表时间：
2012-07-01
期刊：
影响因子：
3.9
通讯作者：
Luo, Z. B.
中科院分区：
文献类型：
--
作者：
Cao, X.;Jia, J. B.;Luo, Z. B.
尽管速生杨树需要消耗大量的水分用于生物量生产，但不同白杨品种的水分利用效率（WUE）存在很大差异。以6个白杨品种的扦插苗为材料，在植物园内进行扦插试验，比较杨树叶片和木质部的生长、水分利用效率及解剖特性的差异，并研究叶片和木质部的解剖特性与光合作用/水分利用效率的关系。分析了这些白杨的生长性能、光合作用、内源水分利用效率（WUEi）、稳定碳同位素组成（d13 C）以及叶片和木质部的解剖特性。结果表明，不同种间在生长、光合作用、WUEi和解剖特性等方面存在显著差异。青杨生长最快，WUEI/d13 C最低，而欧美杨生长量较大，WUEI/d13 C最高。在所分析的白杨品种中，青杨的气孔总密度最高，气孔导度（gs）最高，WUEi/d13 C最低。此外，WUEi与远轴气孔密度和茎导管腔面积之间存在显著的相关性。这些数据表明，光合作用，WUEI和d13 C与叶和木质部解剖和生长和WUEI之间存在权衡。预计一些白杨品种，如P. X euramericana，是水资源有限地区的更好的候选者，而其他杨树品种，如P. cathayana，可能更适合于水资源丰富的地区。
Although fast-growing Populus species consume a large amount of water for biomass production, there are considerable variations in water use efficiency (WUE) across different poplar species. To compare differences in growth, WUE and anatomical properties of leaf and xylem and to examine the relationship between photosynthesis/WUE and anatomical properties of leaf and xylem, cuttings of six poplar species were grown in a botanical garden. The growth performance, photosynthesis, intrinsic WUE (WUEi), stable carbon isotope composition (d13C) and anatomical properties of leaf and xylem were analysed in these poplar plants. Significant differences were found in growth, photosynthesis, WUEi and anatomical properties among the examined species. Populus cathayana was the clone with the fastest growth and the lowest WUEi/d13C, whereas P. X euramericana had a considerable growth increment and the highest WUEi/d13C. Among the analysed poplar species, the highest total stomatal density in P. cathayana was correlated with its highest stomatal conductance (gs) and lowest WUEi/d13C. Moreover, significant correlations were observed between WUEi and abaxial stomatal density and stem vessel lumen area. These data suggest that photosynthesis, WUEi and d13C are associated with leaf and xylem anatomy and there are tradeoffs between growth and WUEi. It is anticipated that some poplar species, e.g. P. X euramericana, are better candidates for water-limited regions and others, e.g. P. cathayana, may be better for water-abundant areas.