Physiology and production of sugar-apple under water stress and application of proline

Abstract

Objetivou-se com este trabalho avaliar a fisiologia e a produçao da pinheira em função dos turnos de rega e aplicaçao foliar de prolina em condiçoes do semiárido Paraibano. Foi utilizado o delineamento de blocos casualizados em esquema fatorial 4 x 2, cujos tratamentos resultam da combinaçao de quatro turno de rega (1, 4, 8 e 12 dias) e duas concentrares de prolina (0 e 10 mM), com quatro repetiçoes, cuja a parcela foi constituida de quatro plantas úteis. O incremento nos turnos de rega reduziu as trocas gasosas das plantas de pinheira, aos 298 dias após o transplantio. A aplicaçao de prolina na concentraçao de 10 mM aumentou o extravasamento de eletrólitos no limbo foliar, a condutância estomática e diminuiu a concentraçao interna de CO2 das plantas de pinheira. A aplicaçao exógena de prolina na concentraçao de 10 mM aumentou os teores de clorofila a, b, total e carotenoides e a massa fresca de frutos nas plantas cultivadas sob turno de rega de 12 dias.

Alternate abstract:

The objective of this study was to evaluate the physiology and production of sugar-apple as a function of irrigation intervals and foliar application of proline under the conditions of Paraíba's semi-arid region. A randomized block design was laid out in a 4 x 2 factorial scheme, with treatments resulting from the combination of four irrigation intervals (1, 4, 8 and 12 days) and two concentrations of proline (0 and 10 mM), with four replicates, and the plot consisted of four usable plants. Increase in irrigation intervals reduced the gas exchange of sugar-apple plants at 298 days after transplanting. Exogenous application of proline at concentration of 10 mM increased contents of chlorophyll a, chlorophyll b, total chlorophyll and carotenoids and fruit fresh mass in plants grown under 12-day irrigation intervals.