Indutores de resistência abióticos no controle da fusariose do abacaxi

Abstract

Resumo -O objetivo deste trabalho foi avaliar o efeito de indutores de resistência abióticos no controle da fusariose (Fusarium guttiforme) do abacaxizeiro na fase pré-colheita, em área de ocorrência natural da doença, e verificar se promoveram alterações físico-químicas e bioquímicas nos frutos. Os produtos testados foram fosfito de potássio, fosfito de cálcio, fosfito de cobre, Agro-Mos, silicato de cálcio, Biopirol e Bion pulverizados em campo, nas dosagens recomendadas pelos fabricantes. Fosfito de potássio, Biopirol e fosfito de cobre foram os mais eficientes na redução da incidência da fusariose do abacaxizeiro em campo, com 91,67, 70,01 e 67,68% de controle, respectivamente. As análises físico-químicas mostraram que os tratamentos não promoveram alteração no pH, nos sólidos solúveis totais e na acidez total dos frutos, enquanto, nas análises bioquímicas, apenas a β-1,3-glucanase apresentou menor atividade em relação à testemunha (água destilada esterilizada), com exceção do tratamento com fosfito de potássio. Assim, a adubação foliar com fosfito de potássio e fosfito de cobre, assim como o tratamento com o Biopirol, podem auxiliar no controle da fusariose do abacaxi.Termos para indexação: Fusarium guttiforme, Agro-Mos, Bion, fosfitos, silicato. Abiotic resistance inducers for control of pineapple fusariosisAbstract -The objective of this work was to evaluate the effect of abiotic resistance inducers on the control of pineapple fusariosis (Fusarium guttiforme) in the pre-harvest period, in an area with natural occurrence of the disease in the field, and to check for any physicochemical and biochemical changes in the fruits. The products tested were potassium phosphite, calcium phosphite, copper phosphite, Agro-Mos, calcium silicate, Biopirol, and Bion sprayed on the field, at the dosages recommended by the manufacturers. Potassium phosphite, Biopirol, and copper phosphite were the most effective in reducing the incidence of pineapple fusariosis in the field, with 91.67%, 70.01%, and 67.68% of control, respectively. The physicochemical analyses showed that the treatments did not promote change in pH, total soluble solids, and total acidity of fruits, while, in biochemical analyses, only β-1,3-glucanase showed lower expression compared with the control (sterilized distilled water), except for the treatment with potassium phosphite. Therefore, foliar fertilization with potassium phosphite and copper phosphite, as well as the treatment with Biopirol, may aid in the control of pineapple fusariosis.

Anthracnose control of ‘Prata-Ana’ banana with pre-harvest phosphite application

“…The result found in the present study confirms the existing literature data. Melo et al (2016) obtained reduction in the Fusarium guttiforme incidence in pineapples with application of copper phosphite. Dantas et al (2018) observed inhibition in the development of Alternaria sp., C. gloeosporioides, Fusarium sp., Geotrichum sp.…”

“…and Lasiodiploidia theobromae fungi using the same copper phosphite formulation. There is no evidence that plants benefit from phosphite as source of phosphorus; however, the elements that accompany this molecule in phosphite-based products such as zinc (zinc phosphite) can act in nutrition, providing this element to plants (DALIO et al, 2012) and having direct action on the pathogen (SILVA et al, 2016). In addition, micronutrients act as cofactors for enzymes involved in the synthesis of phenolic compounds (SILVA et al, 2008).…”

“…Phosphites have been shown to be effective in controlling diseases in various pathosystems, such as rust and downy mildew in grape, rust and powdery mildew in wheat, downy mildew in soy, anthracnose in guavas and rot in apples and peaches (SÔNEGO;GARRIDO, 2005;SAUTTER et al ., 2011;PEREIRA et al, 2010;GOMES, et al, 2016;SILVA et al, 2016).…”

Antifungal Activity of Copper, Zinc and Potassium Compounds on Mycelial Growth and Conidial Germination of Fusarium solani f. sp. piperis

“…The widespread and persistent nature of spp. may be due to its ability to maintain and multiply in a wide variety of complex carbohydrates and proteins, thus resisting adverse climates and high levels of toxic substances such as many antibiotics and seems to incorporate some of the most difficult members of the genus According to Resende et al [34] and Melo et al [35], Cu, Zn and K compounds are used for the control of microorganisms. They can have a direct effect on the pathogen (fungicidal or fungistatic effect) or activate the natural defense of plants, resulting in induced resistance [36,37].…”

Abiotic Compounds as Inducers of Resistance to Fusarium Wilt in Tomatoes

“…In addition, the enzymatic changes can be related to physiological aspects in combination with the induction of the plant's resistance to diseases. Several reports have demonstrated a relationship between induced systemic resistance and enzymes such as peroxidase, polyphenol oxidase, phenylalanine ammonia lyase, β-1,3-glucanase and chitinase (Van Loon, Bakker, & Pieterse, 1998;Chithrashree et al, 2011;Nascimento & Barrigossi, 2014;Melo et al, 2016).…”