航天诱变处理对四种观赏树木幼龄林生长生理特性的影响OA

In order to explore the mutagenic effect of spaceflight mutagenesis treatment on trees,the growth and physiological characteristics of four ornamental trees,Cassia fistula,Delonix regia,Jacaranda mimosifolia and Callistemon rigidus aged three years after spaceflight mutagenesis treatment were measured and analyzed.The results showed that Cassia fistula treated with aerospace mutagenesis showed negative variation compared with the control group.The mean values of four growth traits including tree height,branch height,ground diameter,and breast height diameter are all decreased;The total chlorophyll content significanlty decreased by 27.25%.The activities of Ribulose-1,5-bisphosphate carboxylase(RuBisCO)and ATPase significantly decreased by 36.49%and 54.28%,respectively,and the contents of gibberellin(GA),auxin(IAA),abscisic acid(ABA),cytokinin(CTK)and ethylene(ETH)all decreased.After aerospace mutagenesis treatment,Callistemon rigidus and Delonix regia both showed positive variations.For Callistemon rigidus,the total chlorophyll content significantly decreased by 16.54%,ground diameter significantly increased by 25.22%,soluble protein and ATPase significantly decreased by 20.72%and 31.23%respectively.RuBisCO,superoxide dismutase(SOD)and lipoxygenase(LOX)were highly significantly increased by 61.19%,17.94%and 6.12%,respectively,and GA and ABA were highly significantly increased;Delonix regia showed a highly significant decrease in most of the physiological traits,but all growth traits were increased,and the total chlorophyll content was highly significantly increased by 22.32%.After spaceflight mutagenesis treatment,the branch height of Jacaranda mimosifolia significantly increased by 47.26%,and the total chlorophyll content increased by 15.47%significantly.The contents of soluble protein,catalase(CAT),and LOX decreased significantly by 20.72%,12.49%,and 4.29%,respectively.The activity of peroxidase(POD)was increased by 13.92%significantly.The contents of GA and ABA decreased significantly,while the contents of IAA,CTK,and ETH increased significantly.Compared with the other three materials,Jacaranda mimosifolia showed a more stable overall variation trend.In conclusion,this study provides a theoretical basis for breeding ornamental trees by aerospace mutagenesis.To accelerate the selection process of high-quality ornamental trees,it is necessary to combine the analysis of molecular mechanism and long-term observation to screen for stable and beneficial mutant strains.