航天诱变对四种木本花卉幼苗生长与生理特性的影响

To investigate the effects of space mutation on the growth indexes and physiological and biochemical characteristics of four woody flowers,seeds of Delonix regia,Jacaranda mimosifolia,Cassia fistula,and Callistemon speciosus was treated by carrying on the new generation of manned experimental spacecraft,and then returned to ground,we analyzed the growth indicators,leaf morphology,pigment content,physiological and biochemical activities of them.The results showed that:the plant height,ground diameter,number of leaves of the population of D.regia,J.mimosifolia,C.fistula after space mutation were all lower than those of ground control;the leaves of the populations of J.mimosifolia and C.speciosus were generally reduced,and the leaves of the populations of D.regia and C.fistula were generally increased after space mutation;the total chlorophyll or its components of the four woody flowers to different degrees,the variation range significantly increased the average content of carotenoids in the leaves of D.regia;it greatly affected the variation range of the soluble sugar content in the population of D.regia and J.mimosifolia,and the variation range of Proline content in the population of C.speciosus and C.fistula,on the average activity of PDHA and the population variation of the four woody flowers were significantly affected;the growth and physiological indicators of the four woody flowers were significantly correlated with the space mutation treatment.The above results showed that the growth,physiological and biochemical indexes of the four tree species were significantly affected by space treatment,and the mutation effects on different tree species were different,which is an effective way of woody flower breeding.