不同年代冬小麦品种旗叶解剖结构及光合速率日变化的研究

Studies on the Changes in Leaf Cell Morphology and Diurnal Photosynthetic Rate of Different Wheat Cultivars

对在华北地区推广的冬小麦不同品种旗叶的解剖结构及光合速率日变化作了研究。新老品种相比 ,旗叶叶肉细胞环数增多 ,叶肉厚度逐渐增大 ,细胞层数增多 ;新品种光合作用的“午睡”现象较轻 ,且利用弱光能力增强。研究表明 ,现品种抵抗光伤害的能力较强。

The observation of flag leaf cell morphology and the diurnal photosynthetic changes were carried out in 1999 growing seasons,using field grown wheat plants of 19 winter wheat cultivars as materials,which had been cultivated extensively in North China from early 1950's to 1990's.Wheat breading improved leaf cell morphology.With the order of evolutional succession of the cultivars,the number of mesophyll cells with multi link in flage leaves increased,the mesophyll tissuses in flag leaves became thicker,and the layers of mesophyll cells in flag leaf transections became more.The diurnal changes of photosynthetic rate of these cultivars showed that the mid napping of photosynthesis in updata cultivars was anesised,and their ability using weak light was stronger,and maybe this is related to more multi link cells,thicker mesophyll tissue and more mesophyll cell layer.