Changes in carbohydrates accumulation in Viguiera discolor Baker in response to water deficit

Abstract

Water stress is an environmental factor that can regulate growth, limit production and lead to physiological and biochemical changes. Plants present a series of adaptive responses to drought, such as osmotic adjustment, in which carbohydrates play an important role. To evaluate the influence of water deficit on carbohydrates accumulation in V. discolor, the plants were divided into two groups: daily watering and water suppression for 14 days being re-watering after this period. Leaves and roots were collected at 0, 3, 6, 9, 12, 15 and 18 days, for ecophysiological and biochemical analyzes. Variations in carbohydrate contents in V. discolor showed a close relationship with changes in the plant water status, with higher concentrations of soluble sugars, total fructans, oligosaccharides, reducing sugars coinciding with the lower values of soil moisture and leaf water potentials and relative water content. In the tuberous roots, there is an increase in carbohydrate concentrations after re-watering. The increase of these low molecular weight carbohydrates is involved in osmotic adjustment and therefore acts to protect against dehydration.

Previsão Da Produtividade Do Café Com Base Em Dados Agroclimáticos E Aprendizagem De Máquina / Forecasting Coffee Yield Based on Agroclimatic Data and Machine Learning

“…Dentre os elementos climáticos, a temperatura do ar e a precipitação apresentam maior influência no desenvolvimento do cafeeiro (DAMATTA et al, 2018;DOORENBOS;KASSAM, 1979;TAVARES et al, 2018) A faixa ideal de temperatura do ar para o cafeeiro situa-se entre 19 a 22°C, sendo que temperaturas do ar superiores a 25°C podem acarretar em amarelecimento das folhas, além de propiciar condições ideais para a incidência de diversa pragas e doenças (ACEVES-NAVARRO et al, 2020;MUHARAM et al, 2017;RODRIGUES et al, 2018). A água pode ser considerada o elemento fundamental para a sobrevivência das plantas (HERNANDEZ-ESPINOZA; BARRIOS-MASIAS, 2020), pois atua em diversos processos metabólicos (SANCHES et al, 2019). Sendo assim, o cafeeiro apresenta uma exigência para precipitação pluvial de 1200 a 1800 mm anuais bem distribuídos durante o ano (CARR, 2001).…”