Applied study on into the ecotype GMS H90S in Brassica napus L.

The ecotype GMS H90S have many advantages such as wide restoration, strong combining ability, easy breeding to strong heterosis crosses within recessive GMS(117AB), and height rate of sterile plant within GMS(shan 2GMS and polims GMS) Fertility change and vigour of micro pollen of the ecotype were studied from 1995-1997 The male plant of ecotype GMS manifested steriles in the microtherm and short day,represented in the high temperature and long day,thereby it could be reproduced in Guizhou province in autumn and another districts in summer The setting percentage of sterile plant selfing could change with the climate of years; insemination ability of micro pollec were low The heterosis of GMS is strong, yields of four crosses increased by 10 5% to 27 8% (Youyan No 7) in plot,and increased by 8 5% to 12 3% compared with CK in large field respectively