Influence of gibberellin inhibitors applied during flowering of nonirrigated `Hass' avocado trees

Author(s)

Brogio, Bruna do Amaral ^[1] ; da Silva, Simone Rodrigues ^[1] ; Cantuarias-Aviles, Tatiana ^[1] ; Angolini, Sergio Figueiredo ^[1] ; Baptista, Edypol Guilherme ^[1] ; Ribeiro, Rafael Vasconcelos ^[2]

Affiliation

^[1] Univ Sao Paulo, Escola Super Agr Luiz de Queiroz, Dept Prod Vegetal, Ave Padua Dias 11, Caixa Postal 9, BR-13418900 Piracicaba, SP - Brazil

^[2] Univ Estadual Campinas, Inst Biol, Dept Biol Vegetal, Rua Monteiro Lobato 255, BR-13083970 Campinas, SP - Brazil

• Document type: Journal article
• Source: Pesquisa Agropecuária Brasileira; v. 53, n. 8, p. 918-923, AUG 2018.
• Web of Science Citations: 0

Abstract

The objective of this work was to evaluate the effect of different gibberellin biosynthesis inhibitors on shoot growth above the panicle, as well as on fruit yield, size, and shape of nonirrigated `Hass' avocado (Persea americana) trees. The experiment was carried out in a randomized complete block design, with five treatments, four replicates, and 40 trees. From 2013 to 2015, the following treatments were applied at full bloom, as foliar sprayings: water (control), 250 mg L-1 prohexadione-calcium, 2,500 mg L-1 trinexapac-ethyl, 1,750 mg L-1 paclobutrazol, and 350 mg L-1 uniconazole; the first two are acylcyclohexanediones and the last two, triazoles. Fruit yield, yield efficiency, and alternate bearing were not affected by the application of plant growth regulators. However, the gibberellin inhibitors increased fruit size and modified the fruit shape of nonirrigated `Hass' avocado. Uniconazole reduces shoot growth above the panicle, and this effect may vary depending on environmental conditions, especially water supply. (AU)

• FAPESP's process: 13/11524-0 - Use of plant bioregulators on avocado (Persea americana Mill.) groves in subtropical environment
• Grantee: Simone Rodrigues da Silva
• Support Opportunities: Regular Research Grants