Abstract:

Freezing resistance of 5 Citrus somatic hybrids were studied.The results showed that the freezing resistunce of Valencia sweet orange (C.sinensis Osb.cv.Valencia)+Ichang papeda (C.ichangensis Swingle) was -11℃,Valencia sweet orange+ ‘Key’ lime (C.aurantifolia Key lime) was -7.59℃,Valencia sweet orange+ Meiwa Kumquat (Fortunella Crassifolia Swingle cv.Meiwa) was -9.54℃,Hamlin sweet orange (Citrus sinensis Osb.cv.Hamlin)+ Rough lemon (C.jamhiri L.) was -7.1℃,Hamlin sweet orange + Flying Dragon trifoliate orange (Pocirus trifoliata Raf.cv.Flying Dragon) was -12 89℃.And it was proved that freezing resistance of 5 citrus somatic hybrids was all between parents.Among them Hamlin sweet orange+Flying Dragon trifoliate orange and Valencia sweet orange+Ichang papeda had higher resistance to low temperatures than others.The test was also proved that freezing resistance of citrus somatic hybrids was hardly influenced by cultivation managements.

Key words: Citrus, Somatic hybrid, Freezing resistance