种间杂交杂种金叶榆的叶片形态及呈色生理机制的研究

Study on Leaf Morphology and Color Physiological Mechanism of Interspecific Hybrid Ulmus davidiana×U. pumila cv.jinye.

为了解杂种金叶榆与普通白榆和普通金叶榆叶片形态以及其呈色生理机制之间的差异,用种间杂交无性系杂种1号、杂种2号金叶榆,以普通金叶榆和普通白榆作为对照进行叶形指数、色差、色素含量以及光合生理参数的测定比较。试验发现:普通白榆的叶绿素a、b的含量明显高于普通金叶榆和无性系杂种,4种榆树类胡萝卜素的含量没有明显差异。而金叶榆的净光合速率低于普通白榆。结果表明:2个杂种金叶榆品种叶面积差异显著,但均显著高于普通金叶榆和普通白榆;宽长比差异不显著,但均显著高于普通金叶榆和普通白榆。金叶榆叶片色彩受类胡萝卜素与叶绿素比例的影响,叶片光合作用状态受气孔导度的影响。

The leaf index,color difference,pigment content and photosynthetic physiological parameters were compared with the U.pumila and the U.pumila cv.jinye as the control of the asexual hybrid No.1 and the hybrid No.2.Then the difference between the leaf morphology and the physiological mechanism of color of the hybrid Ulmus davidiana×U.pumila cv.jinye.and common U.pumila and common U.pumila cv.jinye was analyzed.It was found that the concentration of chlorophyll a and B in common U.pumila was significantly higher than that of ordinary U.pumila cv.jinye and asexual hybrids,and There was no significant difference in carotenoid content among four elm species.Leaf brightness of Ulmus davidiana×U.pumila cv.jinyeis higher than that of ordinary U.pumila cv.jinye and common white elm.However,the net photosynthetic rate of U.pumilacv.jinye was lower than that of U.pumila.The results show that the color of U.pumilacv.jiny eleaves is influenced by the content of carotenoids,and the color of leaves is regulated by the light conditions and photosynthesis state.