Influence of the storage environment on the physiological quality of millet seeds (Pennisetum glaucum (L.) R. Br.)

Silva²,

Moura³

et al. 2022

Rev. Agro. Amb.

A Caatinga é um bioma exclusivo do Brasil em que cerca de 80% da sua área já foi modificada. Dessa forma há a necessidade de cada vez mais estudar as espécies vegetais que tenham potencial para a regeneração dessas áreas degradadas. Objetivou-se acompanhar o desempenho fisiológico de sementes de Mimosa tenuiflora, submetidas a tratamentos de superação de dormência após diferentes períodos e condições de armazenamento. Empregou-se o delineamento experimental inteiramente casualizado, com quatro tratamentos pré-germinativos de superação de dormência (testemunha, imersão em ácido sulfúrico por 10 e 13 min. e imersão em soda cáustica 20% por 30 min.), após quatro períodos de armazenamento (0; 50; 100; e 150 dias) em ambiente com e sem refrigeração, adotando-se um esquema fatorial 4 x 4 x 2. Determinou-se antes e após cada período de armazenamento as seguintes avaliações: teor de água, porcentagem, índice de velocidade e tempo médio de germinação, porcentagem, índice de velocidade e tempo médio de emergência, comprimento da parte aérea e do sistema radicular e condutividade elétrica das sementes. A utilização do ácido sulfúrico foi eficiente na superação da dormência das sementes de M. tenuiflora, mantendo os valores máximos ao longo dos períodos de armazenamento. A utilização da soda cáustica por 30 min. só é recomendada no início do armazenamento, sendo que a partir de 50 dias há redução do potencial fisiológico das sementes.

unclassified

Germinação e vigor de sementes de Mimosa tenuiflora após o armazenamento

Silva²,

Moura³

et al. 2022

Rev. Agro. Amb.

Chickpea seed storage in different packagings, environments and periods

Rev. bras. eng. agríc. ambient.

Figueiredo

Tunes

et al. 2022

Storage is a fundamental practice in the control of the physiological quality of seeds, as it is a method that can preserve their viability and vigor for a longer period. Thus, the objective of the present study was to evaluate the storage of chickpea seeds in different packagings, environments, and periods. The completely randomized design was used in a 2 × 2 × 4 factorial scheme, corresponding to two types of packaging (hermetic and Kraft® paper), two storage environments (cold chamber environment and conventional environment), and four storage periods (0, 45, 90, and 135 days), with four replicates. The seeds were placed in Kraft® paper bags and hermetic packagings and stored for 135 days in the environments: cold chamber (14.5 °C and relative air humidity of 65%) and conventional environment (no temperature and relative air humidity control). Every 45 days, seeds were subjected to the following evaluations: determination of water content, germination, first germination count and accelerated aging. In general, the maintenance of the physiological quality of chickpea seeds was verified in Kraft® paper packagings and the cold chamber environment. Storage of chickpea seeds in hermetic packaging must be carried out with seeds with 7% moisture, regardless of the storage environment. The packagings maintained the physiological quality of chickpea seeds for up to 45 days, regardless of the storage environment.

Creole maize from South-West of São Paulo, Brazil: diversity and seed quality

Lima

Fachini

et al. 2022

Remexca

The maintenance of creole seeds promotes preservation of agrobiodiversity and family autonomy. For this reason, seeds quality is essential in the context of creole seeds because directly impacts the improvement of the production field and, consequently, its continuous existence. The study evaluated the diversity and the seed quality of creole maize seeds in two harvests in the South-West of São Paulo, Brazil, an important maize production site in Brazil. Seeds from both harvests (2019 and 2020) were evaluated regarding the physical (physical aspects, one test seed mass, test of infestation), physiological (water content, germination test, seedling emergence in soil, emergence speed index and cold test) and health potential (blotter test). Among 20 lots collected, the seeds were classified into five varieties according to family famers perception. It was observed a variation in terms of physical, physiological and health quality between the seed lots. The lots harvested in 2020 had the highest values of size, 1000 seed mass, germination and vigor. The blotter test identified for both harvests, mainly in 2019, high incidence of Aspergillus sp. and Penicillium sp., considered as storage fungi. Therefore, the variation in seed quality between the harvest refers mainly to the characteristics of the storage process performed. More studies on better strategies for creole maize seed storage are necessary to guarantee seed quality, since low seed quality is a risk for losing these materials.