Peach Flowering Response as Related to Time of Gibberellin Application1

Painter, J. W.; Stembridge, G. E.

doi:10.21273/hortsci.7.4.389

Cited by 14 publications

(3 citation statements)

References 3 publications

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“…The latter indication was fully confirmed by the hormone profiling, showing a general increasing trend of GAs levels (Fig. 6 ), especially for GA 3 and GA 7 [ 22 , 24 – 26 , 28 , 29 , 94 ]. Besides the activation of GAs biosynthesis and signal transduction pathways shown through the KEGG maps (Additional File 9 ), the correlative network pointed out that GA 4 and GA 7 may control the expression of genes mainly dealing with “ cellular macromolecule biosynthetic process ” and “ generation of precursor metabolites and energy ”, respectively.…”

Section: Discussionsupporting

confidence: 56%

A gibberellin-assisted study of the transcriptional and hormonal changes occurring at floral transition in peach buds (Prunus persica L. Batsch)

Girardi,

Canton,

Populin

et al. 2024

BMC Plant Biol

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Background Flower load in peach is an important determinant of final fruit quality and is subjected to cost-effective agronomical practices, such as the thinning, to finely balance the sink-source relationships within the tree and drive the optimal amount of assimilates to the fruits. Floral transition in peach buds occurs as a result of the integration of specific environmental signals, such as light and temperature, into the endogenous pathways that induce the meristem to pass from vegetative to reproductive growth. The cross talk and integration of the different players, such as the genes and the hormones, are still partially unknown. In the present research, transcriptomics and hormone profiling were applied on bud samples at different developmental stages. A gibberellin treatment was used as a tool to identify the different phases of floral transition and characterize the bud sensitivity to gibberellins in terms of inhibition of floral transition. Results Treatments with gibberellins showed different efficacies and pointed out a timeframe of maximum inhibition of floral transition in peach buds. Contextually, APETALA1 gene expression was shown to be a reliable marker of gibberellin efficacy in controlling this process. RNA-Seq transcriptomic analyses allowed to identify specific genes dealing with ROS, cell cycle, T6P, floral induction control and other processes, which are correlated with the bud sensitivity to gibberellins and possibly involved in bud development during its transition to the reproductive stage. Transcriptomic data integrated with the quantification of the main bioactive hormones in the bud allowed to identify the main hormonal regulators of floral transition in peach, with a pivotal role played by endogenous gibberellins and cytokinins. Conclusions The peach bud undergoes different levels of receptivity to gibberellin inhibition. The stage with maximum responsiveness corresponded to a transcriptional and hormonal crossroad, involving both flowering inhibitors and inductors. Endogenous gibberellin levels increased only at the latest developmental stage, when floral transition was already partially achieved, and the bud was less sensitive to exogenous treatments. A physiological model summarizes the main findings and suggests new research ideas to improve our knowledge about floral transition in peach.

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Section: Discussionsupporting

confidence: 56%

A gibberellin-assisted study of the transcriptional and hormonal changes occurring at floral transition in peach buds (Prunus persica L. Batsch)

Girardi,

Canton,

Populin

et al. 2024

BMC Plant Biol

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“…GA3 has also been reported to affect bloom date in peach. Corgan and Widmoyer (3), and Painter and Stembridge (8 ), found that fall application of GA3 could retard flower bud development the following spring. Other workers (5), however, reported that ethe phon and GA3 treatments were not commer cially useful, either because of a lack of response, or side effects which drastically reduced yield.…”

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confidence: 99%

“…The failure of GA3 to delay flowering may have been due to the late application date. Some evidence exists that GA3 can affect both floral initiation as well as differentiation of floral primordia (8 ), and these events might have been completed prior to GA3 treatment.…”

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confidence: 99%

Effect of Ethephon and GA3 on Time of Flowering in Peach

Gianfagna

Marini

Rachmiel

1986

horts

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Ethephon at 200 ppm applied to ‘Cresthaven’ peach trees [Prunus persica (L.) Batsch] in October delayed flowering by 7 days in the first year of this study, but only by 3 days in the 2nd year. Flower bud survival was reduced in both years by this treatment, although the percentage of fruit set increased. The differences observed in the effectiveness of ethephon in delaying bloom may be due to differences in spring temperatures during bud expansion. High temperatures during the period of bud expansion tended to accelerate bud development, minimizing the effect of treatment, whereas low temperatures during this period tended to accentuate treatment effects. GA3 applied in October delayed leaf senescence and abscission, but did not delay flowering.

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