Effects of GA3 and PBZ on Shoot Growth and Expression of GA-related Genes in Peach

doi:10.7668/hbnxb.201751523

Abstract

Abstract: To investigate the effects of exogenous GA₃ and PBZ treatments on the growth of shoots and the expression of genes related to gibberellin biosynthesis and gibberellin signal transduction pathway in Huangshuimi, the annual shoots of Huangshuimi were treated with exogenous GA₃ and PBZ. The growth of shoots was measured and the expression levels of eight GA-related genes were determined by qRT-PCR. The results showed that the net length of shoots at 8 d was significantly higher in GA₃ treatment than in CK. The expressions of KO and GA3-ox showed a trend of firstly increasing and then decreasing in the early stage after treatment, while gradually rising in the later stages. The expression of DELLA, GID1c and SLY1 genes related to GA signal transduction was inhibited at the early stage and then rapidly increased in the late growth period after treatment. And the expression of the three genes was up to maximum in 14 d after treatment. For the PBZ treatment, the net length of shoots was lower than the CK at many stages, and reached to a significant level at 17 d after treatment. The expression of genes related to gibberellin biosynthesis KO, GA20-ox and GA2-ox showed the trend of increasing gradually and then decreased. While GA3-ox showed almost no expression in whole treatment period. The expression of DELLA, GID1c, SLY1 and ERF11 related to gibberellin signal transduction pathway were slightly lower than the CK during the whole process. It was speculated that the exogenous PBZ might regulate the plant growth at the transcriptional level by inhibiting the synthesis of active gibberellin and further affecting the expression of genes involved in the gibberellin signal transduction pathway. Meanwhile, the reverse treatment of GA₃ could significantly abolish the inhibitory effect of PBZ on plant growth, and the expression of GID1c gene involved in gibberellin signal transduction pathway increased firstly and then decreased under GA₃ treatment, while the expression of DELLA gene appeared to be inhibited in most of the time.

Key words: Peach, Gibberellin, Paclobutrazol, The length of the shoot, Reverse treatment, Gene expression

CLC Number:

S662.03
Q78

TAN Bin, WANG Ting, HAO Pengbo, ZHENG Xianbo, CHENG Jun, WANG Wei, FENG Jiancan. Effects of GA₃ and PBZ on Shoot Growth and Expression of GA-related Genes in Peach[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2019, 34(2): 25-34. doi: 10.7668/hbnxb.201751523.

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