Studies On Variability Of Eui-P(T) GMS-LINE FueS1

eui-P(T)GMS-line FueS1 possessed eui gene was the first photo-thermo period sensitive genic male sterile rice which was bred by the methods of eui-hybrid breeding technology, as well as its corresponding hybrid rice was released. During the past several years in the seed production, two different plant variants, tall plant and dwarf plant, were found in the population of FueS1, especially,the tall varivant could influence on the application of FueS1．In order to find out the original reason of tall variant and dwarf variant, the biological characters and origin of tall variant and dwarf variant were investigated in this paper. The main results as follows:(1) Two types of variants, tall plant and dwarf plant were found in the population of FueSl with a frequency of 9．31×10-5 and 2．12×10-5 respectively.(2) The plant height of the tall variant is 20-50cm higher than that of FueS1．The plant height increased is due to the elongation of first internode, second internode and third internode.The plant height of the dwarf variant is lower than that of FueS1, with poor panicle exsertion. and shorten first internode. The plant type of dwarf variant is similar to peiai64S.(3) Genetic analysis showed that the trait of tall variant is also controlled by eui genes, while the dwarf variant is because of the reverse mutation of eui gene.(4) The seed setting rate of tall varivant is higher than that of FueS1 in fertile period,and it displays a certain degree fertile in sterile period.(5) Tall variant is due to the increase of the critical point of temperature expression of FueS1, which results in better seed setting in fertile period, and displaying a certain degree fertile restoration in sterile period.