PESSOA, J. L.; http://lattes.cnpq.br/2741869332499746; PESSOA, Jessica de Lima.
Abstract:
Water stress can affect plants in several aspects, promoting reduction in stomatal
conductance and photosynthesis, resulting severe alterations in growth, development
and chemical composition, which can lead them to death. This study aimed to
analyze the stomatal behavior of young plants of Handroanthus impetiginosus under
progressive water stress, and how they behave after rehydration. Plants with 12
months of age were subjected to two treatments: irrigated and water stress imposed
by withholding water. It was daily evaluated the relative water content, stomatal
conductance, transpiration rate, intercellular CO2 concentration, and photosynthetic
rates. After ten days remained under this stress condition, irrigation was restored,
and recovery was evaluated. Drought stress decreased rapidly and progressively the
relative water content, stomatal conductance, transpiration, carboxylation efficiency
and photosynthesis of plants. It was observed increase in intercellular CO2
concentration with increase of water stress. After the resumption of water supply, the
plants showed recovery in these physiological processes. Water stress did not affect
the water efficiency use of plants.
