DSpace Coleção: Artigo em periódico indexado (CPATSA)

Applying a saponin complex of Pseudalbizzia inundata (Mart.) Koenen & Duno as surfactants of Beauveria bassiana (Balsamo) Vuillemin conidia to control Bemisia tabaci Gennadius.

Mon, 01 Jan 2024 00:00:00 GMT

Título: Applying a saponin complex of Pseudalbizzia inundata (Mart.) Koenen & Duno as surfactants of Beauveria bassiana (Balsamo) Vuillemin conidia to control Bemisia tabaci Gennadius. Autoria: OLIVEIRA, G. S.; GAVA, C. A. T.; FÉLIX, W.; GERVÁSIO, R. de C. R. G.; COSTA-LIMA, T. C. da Conteúdo: Biosurfactants secondary plant metabolites, such as saponins, could be an efficient green alternative dispersant for entomopathogenic fungi propagules. This work aimed to evaluate the potential of a saponins’ complex extracted from Pseudalbizzia inundata (Mart.) Koenen & Duno (PSC) to disperse conidia of Beauveria bassiana IBCB66 (Balsamo) Vuillemin (Hypocreales: Cordycipitaceae) as also its’ insecticidal activity against Bemisia tabaci Gennadius (Hemiptera: Aleyrodidae). Despite a negligible effect on fungal germination and mycelial growth at the highest concentration of PSC (1,000 mg L-1), conidia production was significantly inhibited, resulting in a biological index of 52.03 at the higher dose, which characterises PSC as moderately toxic to B. bassiana. However, no effect was detected on the viability of conidia produced in media added with PSC. When applied directly on cowpea leaves, the saponins did not show an insecticidal effect on B. tabaci eggs and nymphs. PSC solution produced an adequate dispersion of B. bassiana IBCB66 conidia, causing nymph mortality higher than 90%, similar to Triton X-100, and adult mortality of 60% with a median survival time (ST50) of 8 days. A probit analysis of dose-effect of IBCB on both surfactants showed no difference between PSC solutions and Triton according to the parallelism test, with LC50 of 2.35 and 1.44 × 107 conidia mL-1 for PSC and Triton, respectively. These findings underscore the potential of PSC as a safe and effective substitute for synthetic surfactants to disperse the conidia of entomopathogenic fungi.

Additives for sustainable fruit packaging: a systematic review.

Wed, 01 Jan 2025 00:00:00 GMT

Título: Additives for sustainable fruit packaging: a systematic review. Autoria: PARENTE, A. G.; SOUZA, A. C. de; FERREIRA, F. S.; SILVA, H. S. G. e; FREITAS, S. T. de; MAIA, G. L. de A.; NERI, D. F. de M. Conteúdo: Fruit packaging plays a crucial role in preserving quality, ensuring safety, extending shelf life, and reducing postharvest waste. This study systematically reviewed 316 studies conducted in 34 countries over the past six years to evaluate the role of additives in improving the structural and functional properties of packaging and their efficiency in maintaining fruit quality. The review focuses on three main packaging methods: direct fruit coating, fruit wrapping, and alternative approaches. A total of 83 types of chemical, physicochemical, biological, mechanical, and sensory tests were analyzed to assess the performance of these packaging systems. Key findings reveal innovations in active, edible, functional, intelligent, and sustainable packaging, with an emphasis on environmental sustainability and food safety. Notable additives, such as glycerol, essential oils, natural extracts, Tween, nanocellulose, silver nanoparticles, zinc oxide, and calcium chloride, demonstrated the ability to enhance film and coating properties, including elasticity, antimicrobial activity, and UV protection. These advancements contribute to the extension of shelf life across various fruit species, addressing global challenges in reducing food waste. This review highlights the systematic identification of trends, gaps, and opportunities in additive applications for fruit packaging, offering insights for the development of sustainable and effective packaging solutions. By consolidating diverse findings, this study provides a foundation for future innovations in the field, aligning with growing consumer demand for environmentally responsible and efficient postharvest technologies.

Biochemical and enzymatic alterations of watermelon associated with irrigation management and inoculation with Rhizobacteria.

Wed, 01 Jan 2025 00:00:00 GMT

Título: Biochemical and enzymatic alterations of watermelon associated with irrigation management and inoculation with Rhizobacteria. Autoria: ARAÚJO, M. G. de; MESQUITA, A. C.; SIMOES, W. L.; CARVALHO, R. N. de; FELIX, A. T. R.; SILVA, J. S. da Conteúdo: Water stress has caused major losses in the agricultural productivity of crops, inducing the search for alternatives for sustainable cultivation. In this context, the objective of this study was to evaluate the tolerance of watermelon under water stress, inoculated with bacterial strains of the genus Bacillus spp., regarding the biochemical and enzymatic variables in the flowering stage. A randomized block design was adopted in a split-plot 4x4 factorial scheme, with plots consisting of four levels of soil water availability (40%, 60%, 80% and 100% of field capacity - FC) and subplots consisting of four inoculations (Negative Control (NC); XX6.9 bacteria; P6.2 bacteria; MIX – co-inoculation of XX6.9 and P6.2 bacteria), with five replicates. XX6.9 bacteria and NC were the treatments most affected by severe water stress, since at the soil water availability (SWA) level of 40% FC they showed high contents of the oxidative marker (MDA) and proline. Although the inoculation with XX6.9 bacteria promoted a higher content of osmoregulators such as proteins, total soluble sugars and reducing sugars, it was not enough to attenuate the effects of water deficit. On the other hand, treatments with P6.2 bacteria and MIX of bacteria showed reduced levels of MDA at the SWA level of 40% FC, accompanied by high enzymatic activity of POD and CAT, which may contribute to the tolerance of the watermelon crop to water stress. Keywords: Plant growth promotion; reactive oxygen species; semi-arid region; oxidative stress; hydric stress.

Physicochemical composition of the milk and cheese yield of sheep supplemented with concentrate based on corn grain or whole cottonseed.

Sun, 01 Jan 2023 00:00:00 GMT

Título: Physicochemical composition of the milk and cheese yield of sheep supplemented with concentrate based on corn grain or whole cottonseed. Autoria: SANTOS, R. N.; NOGUEIRA, G. H. M. de S. M. F.; NOGUEIRA, D. M.; VOLTOLINI, T. V.; LOPES JÚNIOR, E. S. Conteúdo: This study aimed to evaluate the effects of nutritional supplementation with concentrate based on corn grain or whole cottonseed on the milk yield, physicochemical composition of the milk and the cheese yield from lactating sheep. Twelve Lacaune x Santa Ines ewes were kept on irrigated pasture of Tifton 85 (Cynodon dactylon) and were distributed in replicated 3 × 3 Latin Square design. The animals were allocated into three experimental groups for 63 days of supplementation, as follows: Pasture (composed of Tifton 85 grass without supplementation), Corn (concentrated mixture containing ground corn grain and Tifton 85 pasture) and Cottonseed (concentrated mix containing whole cottonseed and Tifton 85 pasture). The milk from the Cottonseed group showed higher values (P < 0.05) of non-fat solids, protein, minerals, density, freezing point when compared to the Pasture and Corn groups, but there was no difference (P > 0.05) for fat content and milk yield among Pasture, Corn and Cottonseed groups. Cheese yield in the Cottonseed group was 30 % higher than the cheese yield in the Corn group (P > 0.05). The inclusion of 50 % of whole cottonseed in concentrate supplementation of crossbred ewes increases the physicochemical composition of the milk, and this may improve the cheese yield of manufactured cheeses.