Abstract
The ZIG/VTI11 is Qb-SNARE involved in the vesicle transport from TGN to PVC/vacuole in Arabidopsis. The zigzag (zig) mutant is the VTI11 null allele and exhibit abnormal garavitropism and morphogenesis. To elucidate the molecular mechanism and physiological function of post-Golgi vesicle transport in higher plant, we have isolated several suppressor mutants of zig of Arabidopsis. Our previous study demonstrated that the dominant mutation zig suppressor1 (zip1) almost completely suppress the defects of zig-1.The recessive mutation zip2 and SC2-1 partially supress the defects of zig-1 mutant both in garavitropism and in morphogenesis. The position of ZIP2 and SC2-1 gene were mapped apploximately 10cM and apploximately 80cM of chromosome 1, respectively. These loci are different from the position of ZIP1/VTI12 gene. These genes are also expected to be involved in post-Golgi vesicle transport.
