60Co-γ辐射对大花紫薇叶绿素荧光特性的影响

为探究60Co-γ射线辐射处理种子对大花紫薇生长发育中光合效率的影响,以大花紫薇种子为试验材料,以不同60Co-γ射线辐射剂量(0、20、60、100、140、180 Gy)进行辐射处理,测量不同处理生长发育过程中叶绿素及光合指标的变化,研究其对紫薇光合系统的影响。结果表明:20、60 Gy处理较对照和其他处理叶绿素质量分数更高,更有利于叶片进行光合作用;60、100 Gy处理较对照和其他处理潜在光合速率和最大光合效率更好;各时期光合性能指数与综合性能指数均呈现先上升后下降的趋势,但随时间的增加整体呈现下降的趋势,60 Gy较其他处理性能指数高。由此得出,60 Gy辐射处理有利于大花紫薇光合色素的产生与积累,较好的增加电子传递效率,有利于光合系统的运转和能量的积累。

Effect of 60Co-γ Radiation on Chlorophyll Fluorescence Characteristics of Lagerstroemia speciosa Pers

In order to explore the effect of 60Co-γ-ray irradiation on the photosynthetic efficiency of Lagerstroemia speciosa Pers., the seeds of L. speciosa were tested with different 60Co-γ-ray irradiation doses(0, 20, 60, 100, 140, and 180 Gy). Radiation treatment was carried out to measure the changes of chlorophyll and photosynthetic indexes during the growth and development of different treatments, and the effects on the photosynthesis system of L. indica were studied. The 20 and 60 Gy treatment had higher chlorophyll content than control and other treatments, and more it is beneficial to photosynthesis of leaves. The 60 and 100 Gy treatment is better than control and other treatments for potential photosynthetic rate and maximum photosynthetic efficiency. PI,a,b,s and PI,total show a trend of increasing first and then decreasing, but increasing with time. The decreasing trend of 60 Gy is higher than that of other processing PI indexes. It is concluded that 60 Gy radiation treatment is beneficial to the production and accumulation of photosynthetic pigments of L. speciosa, better electron transfer efficiency, and is conducive to the operation of photosynthetic system and energy accumulation.