Aceitação sensorial do abacaxi “FRF 632”, resistente à fusariose, em diferentes estádios de maturação / Sensory acceptance of fusariosis resistant pineapple “FRF 632” at different maturation stages

O objetivo desse estudo foi avaliar a influência do ponto de colheita na qualidade sensorial e físico-química de abacaxi “FRF632”. Os frutos foram avaliados por 59 julgadores à cor, aroma, sabor, textura/firmeza, aceitação global e intenção de compra. Avaliou-se também a acidez titulável, o teor de sólidos solúveis e a relação sólidos solúveis/acidez titulável. Os consumidores gostaram dos frutos, com percentual de aprovação superior a 75% para todos os atributos. A doçura e a acidez dos frutos, nos estádios de maturação “amarelo” e “colorido”, foram consideradas ideias por um maior número de consumidores. Conclui-se que os consumidores preferiram consumir frutos colhidos nos estádios de maturação “colorido” e “amarelo”, pois os consideraram com melhor cor, sabor e aroma, doçura e acidez ideais, além de maior intenção de compra.

Antifungal activity of plant extracts with potential to control plant pathogens in pineapple

Objective: To evaluate the in vitro antifungal activity of extracts, resins, oils and mother tinctures from plants against the filamentous fungi Fusarium guttiforme (F. guttiforme) and Chalara paradoxa, and to evaluate the control of the pineapple fusariosis in situ using mother tinctures. Methods: The screening of the antifungal potential of 131 extract forms from 63 plant species was performed in vitro by using plate-hole method. To control pineapple fusar-iosis in situ, preventive and post-infection treatments were performed on detached pineapple leaves of cv. P′erola (susceptible). Results: The quantitative study indicated that among the 49 mother tincture samples analyzed, 46% were effective against F. guttiforme and 29% for the Chalara paradoxa. The natural plant extracts, mother tincture of Glycyrrhiza glabra (MTGG1), mother tincture of Myroxylon balsamum (MTBT2), mother tincture of Aloe vera (MTAV3), mother tincture of Allium sativum (MTAS4), resin of Protium heptaphyllum (RESAM5) and crude extracts of Rhizophora mangle (CEMV6), exhibited an antifungal activity against F. guttiforme. In the preventive treatment against pineapple fusariosis, MTAV3, MTAS4 and MTGG1 were statistically similar to the treatment with tebuconazol fungicide. The curative treatments with MTAV3, MTAS4, MTGG1 and MTBT2 presented similar activity to fungicide (P Conclusions: The findings of the present study concluded that mother tinctures can effectively control phytopathogens. The mother tincture extract of Myroxylon balsamum showed antifungal activity and was used here for the first time for inhibition of phyto-pathogenic fungi. This study paves the way for the development of bioactive natural products with phytosanitary applications, with the added benefits of an environmentally safe and economically viable product.

Antifungal activity of plant extracts with potential to control plant pathogens in pineapple

Objective: To evaluate the in vitro antifungal activity of extracts, resins, oils and mother tinctures from plants against the filamentous fungi Fusarium guttiforme (F. guttiforme) and Chalara paradoxa, and to evaluate the control of the pineapple fusariosis in situ using mother tinctures. Methods: The screening of the antifungal potential of 131 extract forms from 63 plant species was performed in vitro by using plate-hole method. To control pineapple fusariosis in situ, preventive and post-infection treatments were performed on detached pineapple leaves of cv. Pérola (susceptible). Results: The quantitative study indicated that among the 49 mother tincture samples analyzed, 46% were effective against F. guttiforme and 29% for the Chalara paradoxa. The natural plant extracts, mother tincture of Glycyrrhiza glabra (MTGG1), mother tincture of Myroxylon balsamum (MTBT2), mother tincture of Aloe vera (MTAV3), mother tincture of Allium sativum (MTAS4), resin of Protium heptaphyllum (RESAM5) and crude extracts of Rhizophora mangle (CEMV6), exhibited an antifungal activity against F. guttiforme. In the preventive treatment against pineapple fusariosis, MTAV3, MTAS4 and MTGG1 were statistically similar to the treatment with tebuconazol fungicide. The curative treatments with MTAV3, MTAS4, MTGG1 and MTBT2 presented similar activity to fungicide (P < 0.05). Conclusions: The findings of the present study concluded that mother tinctures can effectively control phytopathogens. The mother tincture extract of Myroxylon balsamum showed antifungal activity and was used here for the first time for inhibition of phytopathogenic fungi. This study paves the way for the development of bioactive natural products with phytosanitary applications, with the added benefits of an environmentally safe and economically viable product.

Caracterização físico-química de novos híbridos de abacaxi resistentes à fusariose / Physico-chemical characterization of new hybrids pineapple resistant to fusariosis

Cinco genótipos de abacaxi (Gold, Pérola, Smooth Cayenne, BRS Vitória, BRS Imperial) e quatro novos híbridos (SC x PRI-21, SC48 x PRI-02, PE x SC-73 e PA x PE-01) foram avaliados quanto às suas características físico-químicas. A cultivar 'Gold' apresentou os maiores teores de carotenoides totais (7,82µg g-1) e vitamina C (51,0mg 100g-1), enquanto que a cultivar 'BRS' Imperial destacou-se pelos elevados teores de açúcares redutores (5,12%), açúcares totais (15,23%), sólidos solúveis (18,41°Brix), pH (3,96) e ratio (35,28). Os híbridos SC 48 x PRI-02, PE x SC-73 e PA x PE-01 apresentaram teores de sólidos solúveis, açúcares totais e redutores superiores aos das cultivares Smooth Cayenne, Pérola e BRS Vitória, destacando-se o híbrido PE x SC-73 por apresentar polpa amarela mais intensa, doçura elevada, elevado teor de carotenoides totais e vitamina C, sendo, portanto, um híbrido promissor para substituição de cultivares comerciais.

Five pineapple genotypes (Gold, Pérola, Smooth Cayenne, BRS Vitória and BRS Imperial and four new hybrids - SC x PRI-21, SC48 x PRI-02, PE x SC-73 and PA x PE-01), were evaluated for their physicochemical characteristics. The 'Gold' cultivar presented the highest contents of total carotenoids (7.82mg g-1) and vitamin C (51.0mg 100g-1), whereas the 'BRS' Imperial stood out for its high levels of reducing (5.12%) and total (15.23%) sugars, soluble solids (18.41°Brix), pH (3.96) and ratio (35.28). Improved hybrids SC 48 x PRI-02, PE x SC-73 and PA x PE-01 had the soluble solids, reducing and total sugars contents higher than those of cultivars 'Smooth Cayenne', 'BRS Vitória' and 'Pérola', highlighting the 'PE x SC-73' hybrid for its pulp of intense yellow color, high sweetness, high content of total carotenoids and vitamin C and which was considered as a promising hybrid to replace commercial cultivars.