Study On Mutagentic Effects Of Aerospace On SP1 Of Jatropha Curcas L.

Aerospace has different environmental conditions from the biosphere of the earth such as gravity, radiation, and magnetic field. Plant growth, development and genetic information may be affected under the aerospace conditions. Genetic changes may be used as an effective means of creating new germ plasm.The seeds of 2 provenances of Jatropha curcas L. were carried by spaceship. The primary objective of this study was to identify the possibility mutations of seeds induced by aerospace and to select plants which had advantageous traits. So the seeds vigor, growing development and photosynthetic characteristics were analyzed. The results showed as following:1. Effections of specelight on Jatropha curcas L. seeds were significant .Germination rate and germination energy of 2 provenances showed a decrease as a whole, while the seedling survival rate had no obviously changes. The results indicated that spaceflight can significant inhibit vigor of Jatropha curcas L.2. There were differences between spacetreatments and ground controls in plants height, diameter, width, primary/top branches. For example, in one-year old plants, Yuanyang provenances were lower than the control. while Banna provenances were higher than the control. The twe-year old plants of 2 provenances were both heighter than that of the ground controls. And the days of spacetreatments from setting to flowering and maturation days shorts than control, the number of flower, the ratios of female to male and the ratios of native fruiting on the first, second and third inflorescence also higher. It was showed that the trend of mutation of the plants' growth development were positive.3. Space environment had obvious effects on the yield of two-year old plants of Jatropha curcas L. After mutation, the yield of single plant increased significantly, the yields of Banna (339.50g) was highter than that of the control(183.15g), the yields of Yuanyang(363.71g)were also highter than that of the control(219.66g). While seeds oil showed no significant difference.4. Photosynthesis characteristics were analyzed; the resulits indicated that there were significant differences between spacetreatments and controls. the two-year old plants of 2 provenances were higher than the control in net photosynthesis rate, and the apparent quantum efficiency of spacetreatments were all increased. The content of the chlorophyll a and b and a/b ratio of 2 provenances were the same as control. 5. Correlations of main economic traits of Jatropha curcas L. after spaceflight were different from control. The average oil yield of selected individual plants hight than than of the control.The results of this study provided preliminary insight about the physiology changes of Jatropha curcas L.induced by space environment. The plants selected in the study are to be used as materials in breeding and the future researches.