Research on the variation of ‘Hangmu 1’ agronomic characters in SP1 generation by re-onboard in space

In this study the test materials (HY2) from seed cultivation SP1 generations were used. By comparing with the agronomic characters of ‘Hangmu 1’ planting material on the earth, the mutagenic effects of alfalfa cultivar ‘Hangmu 1’ by re-onboard in space were studied. The preliminary results indicated that the average of plant height, branch number and multifoliate ratio were significantly higher than the control, ‘Hangmu 1’ by re-onboard in space showed strong growth vigor(P<0.05). The multifoliate plants were less than the control, the number of 7 leaflets plants significantly increased (P<0.05)and five plants had 7 leaflets ratio more than 60%. 5 leaflets plants were less than the control and 5 leaflets plants possessing 5 leaflets ratiomore than 60% significantly increased(P<0.05). The mutagenic effects were obvious and useful variation was rich. The research would provide an effective breeding approach and the excellent germplasm resources to the further improvement of alfalfa cultivar.