Evaluation of Five Dormancy Breaking Agents to Induce Synchronized Flowering in 'Rocha' Pear

Pereira, Natali Almeida Evangelista; Oliveira, Clair Motos de; Mota, M.; Sousa, Raquel

doi:10.17660/actahortic.2011.909.48

Cited by 5 publications

(1 citation statement)

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“…What was also noteworthy considering NO treatments, was that both NO donors in the current study, including NO2 10 μM and 10 μM Snitrosoglutathione (SNO 10 μM), resulted in enhanced final cumulative bud-break percentages in two of the three experiments (Table 3). Such results are in line with literature which has linked NO donors to bud dormancy-release, as well as its involvement in the HC-induced cascade [19,24,26,30,56,57].…”

Section: Small-scale Field Trial: Evaluation Of Plant Biostimulants S...supporting

confidence: 92%

Plant Biostimulants Enhance Bud Break in Vitis vinifera Crimson Seedless

Venter,

Avenant,

Kotze

et al. 2024

Preprint

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The rest-breaking agent, hydrogen cyanamide (HC), can substitute insufficient chill unit accumulation in Vitis vinifera and induce uniform bud-break; however, due to its toxicity it is being banned. In South Africa, red seedless grapes, including V. vinifera Crimson Seedless (CS), are the largest table grape export group; therefore, replacing HC in V. vinifera CS is crucial. This study aimed to confirm the molecular triggers induced by HC and assess the bud-break-enhancing abilities of commercial plant biostimulants. Forced bud-break assay experiments using V. vinifera CS single-node cuttings and a small-scale field trial were performed. Results demonstrated that increased chill unit accumulation (CUA), reduced HC efficacy. Bud-break started between 10 and 20 days after treatment, irrespective of final CUA. The small-scale field trial found that HC3 % resulted in a slightly delayed bud-break rate, whilst biostimulants were similar to the negative control. The treatment of dormant grapevine compound buds with nitric oxide (NO), hydrogen peroxide (H2O2), and hypoxia trigger dormancy-release to a certain extent, supporting the molecular models proposed for HC action. NO, H2O2, and hypoxia, in combination with PBs, may potentially replace HC; however, this needs to be confirmed in future experiments.

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