Abstract:

The IAA, GA3, ZR and ABA contents in the root, steam and leaves of cassava varieties ‘SC124’ and ‘Fuxuan01’ were studied. The results showed that the varying tendencies of IAA, GA3 and ZR in the root, steam and leaves were similar between ‘SC124’ and ‘Fuxuan01’. The contents of IAA, GA3 and ZR increased firstly and then decreased in the root; in the steam, the contents of IAA, GA3 and ZR firstly decreased and then increased, and the content of IAA, GA3 and ZR decreased gradually in the leaves. The content of ABA was different to IAA, GA3 and ZR, it increased gradually in the whole growing period. The changes of endogenous hormone content were different in different varieties. The contents of IAA in tuberous roots of ‘Fuxuan01’ were higher than those of ‘SC124’, but there was no significant difference in the latter. There was no significant difference of the contents of GA3 in early growth stage between ‘Fuxuan01’ and ‘SC124’, but the contents of GA3 of ‘SC124’ were higher than those of ‘Fuxuan01’ in middle and late growth stage. There was no significant difference of the contents of ZR in early growth stage between ‘Fuxuan01’ and ‘SC124’, but the contents of GA3 of ‘Fuxuan01’ were higher than those of ‘SC124’ in middle growth stage, and ‘SC124’ was higher than ‘Fuxuan01’ in late growth stage. The contents of ABA in tuberous roots of ‘SC124’ were higher than those of ‘Fuxuan01’ in all growth stage, but on the contrary in leaves. The endogenous hormone contents in tuberous roots, stems and leaves were different in different growth stage. The endogenous hormone IAA, GA3, ZR, ABA contents were different in starch content different varieties.