Effects of exogenous BAP, GA3, and ABA on endogenous auxin and rooting of grapevine [Vitis] hardwood cuttings
1997
Kawai, Y. (Mie Univ., Tsu (Japan). Faculty of Bioresources)
The effects of applications of 6-benzylaminopurine (BAP), gibberellic acid (GA3), and abscisic acid (ABA) on the root formation of grapevine hardwood cuttings were investigated. BAP suppressed rooting of grapevine cuttings completely, whereas GA3 and ABA inhibited it temporarily. Endogenous indoleacetic acid (IAA) in cuttings treated with BAP increased linearly to 12.6 and 19.4 times per cutting and per g fresh weight, respectively, over the control for 30 days after planting. In cuttings treated with GA3, the level of diffusible IAA was higher than that of control cuttings through the experimental period; the fluctuation pattern of extractable IAA was similar to that of the control. In cuttings treated with ABA, the extractable IAA content was significantly lower than that in control cuttings 10 days after planting. The fluctuation pattern of endogenous IAA in BAP treatment was different from that in GA3 ABA treatments. Cuttings treated with BAP presumably failed to root because the level of endogenous IAA was unbalanced. GA3 may inhibit root formation directly whereas ABA may cause inhibition of rooting by depressing the bud activity
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