Effect of laser processing of the seeds on the seedling's dry resistance of the Chinese Pine
Junlin Wu, Wang She-zhu, Sheqi Zhang, Guo Jin · Xibei Nong-Lin Keji Daxue xuebao. Ziran kexue ban · 2006
He-Ne laser with a wavelength of 632.8 nm and the output power of 5.8 mW/mm~2 was used to radiate Chinese pine.By contrast with the non-radiated seeds,the change of the content of malondialdehyde(MDA),of autoxidation rate and of cell defense enzyme activity in the leaves of Chinese pine seeding were measured with passage of the time.In both laser processing group and control group,the results indicated that with the of continuing water stress,both the generating rate of O~(-·)_2 and the content of H_2O_2 rose at the beginning and declined later;the content of MDA showed change of wave properties,the activity of all cell defense enzyme including SOD,POD,CAT descended gradually.The activity of cell defense enzyme of the radiated group can be enhanced,compared to control group;the prodution of activated oxygen was restrained and the memebrane lipid per oxidation was reduced as well;Consequently,the damage of activated oxygen to the membrane was reduced efficiently;the adaptability of Chinese pine seeding to water stress was enhanced to some extent.