Qualidade Sanitária E Fisiológica De Sementes De Araucária Durante Armazenamento

Abstract

RESUMOAraucaria angustifolia é uma espécie de importância ecológica e socioeconômica na região Sul do Brasil, porém, em risco de extinção. Sua semente é classificada como recalcitrante, necessitando armazenamento sob temperatura e umidade relativa controladas para maior longevidade. Outro aspecto refere-se à qualidade sanitária das sementes, a qual é prejudicada pelo elevado teor de água que causa a proliferação de fungos, os quais podem reduzir a germinação. Este trabalho teve como objetivo avaliar a qualidade sanitária e fisiológica de sementes de araucária desinfestadas com solução de hipoclorito de sódio (NaClO) a 0,5; 1 e 3 % e submetidas a diferentes períodos de armazenamento (2, 4, 6, 8 e 12 meses). A qualidade das sementes foi avaliada pelos testes de germinação, vigor e sanidade. A desinfestação das sementes, independentemente da concentração utilizada, retardou temporariamente a germinação das mesmas, porém, não afetou negativamente a emergência das plântulas. Após 12 meses de armazenamento, verificou-se a infecção das sementes por Schizophyllum commune, o que causou a redução da germinação. As sementes tratadas com NaClO apresentaram menor incidência de fungos, especialmente Schizophyllum commune, garantindo a qualidade sanitária das mesmas durante o armazenamento por 12 meses. O tratamento com NaClO favorece positivamente a qualidade fisiológica das sementes de araucária que serão armazenadas por período superior a 4 meses. Palavras-chave: Araucaria angustifolia; germinação; vigor; patologia de sementes. ABSTRACTAraucaria angustifolia is a species of ecological and social-economic importance in the southern Brazil region, but it is at risk of extinction. Its seeds are classified as recalcitrant, requiring storage under controlled temperature and humidity to obtain greater longevity. Another aspect is the seed health quality, which is impaired by high seed moisture content that causes fungus proliferation and may reduce germination and seedling quality. The objective of this study was to evaluate the physiological and sanitary quality of araucaria seeds treated with 0.5, 1 and 3 % of sodium hypochlorite (NaClO) and stored at different periods (2, 4, 6, 8 and 12 months). The seed quality was evaluated by germination, vigor and seed health tests. The disinfection of seeds, regardless of the concentration used, temporarily delayed the seed germinations, but did not negatively affect seedling emergence. After 12 months of storage, the seeds showed infection by Schizophyllum commune, which caused the reduction of the germination. The seeds treated with NaClO showed lower fungal incidence, especially Schizophyllum commune, ensuring the seed health quality during storage for 12 months. The treatment with NaClO positively favors the physiological quality of Araucaria seeds that will be stored for a period exceeding four months.

Storage stability of minimally processed pinhão by using edible coatings with antimicrobial characteristics

“…Penicillium sp. are important storage fungi that affect the pinhões (Hennipman, Santos, Vieira, & Auer, 2017) and may be indicators of the deterioration of seeds and grains (Cardoso et al, 2011). The slight increase observed in the reducing sugar values may be due to the conversion of starch to soluble sugars as a function of the maturation process (Toivonen & Brummell, 2008).…”

Seed pathology of non-domesticated species of tropical ecosystems

“…The results of forest seed health obtained in research developed with seed treatment, involving physical methods (Oliveira et al, 2011;Lazarotto et al, 2013;Françoso and Barbedo, 2014;Hennipman et al, 2017), biological methods (Fantinel et al, 2015;Martín-García et al, 2017;Silva et al, 2018) and more recently the use of plant extracts (Choudhury et al, 2018;Dourado et al, 2020;Lima et al, 2020;Almeida et al, 2021;Andrade et al, 2021), have shown some advances in pathogen control. However, studies that seek to increase the storage period, especially of species intolerant to desiccation, despite important advances, have not yet achieved substantial gains, obtaining an extension for a few months or, exceptionally, years (Barbedo, 2018).…”

Limonium brasiliense (Boiss.) Kuntze Seeds: Disinfestation and Conservation of Viability Under Storage

“…In this case, non-disinfested seeds were more frequently attacked by fungi, especially by Penicillium, which negatively affected germination. On the other hand, Hennipman et al (2017) reported that the beginning of germination in Araucaria angustifolia (Bertol.) Kuntze was delayed when seeds were treated with sodium hypochlorite, which caused a temporary damaging effect on germination, and this was not observed in the present study.…”