TORRES, R. A. F.; http://lattes.cnpq.br/5845804858938276; TORRES, Rafaela Aparecida Frazão.
Resumen:
The prolonged periods of drought have hampered the cultivation of fruit trees in the semi-
arid region of Paraíba, making their growth and development unfeasible, bringing a series of
losses to producers, making it necessary to adopt irrigation management strategies, and the
search for alternatives that may mitigate the effects of stress on plants. Thus, the objective of
this work was to evaluate the effects of foliar application of proline as a mitigator of water stress
on the physiology and production of sugar apple in the semi-arid region of Paraíba. The research
was carried out under field conditions in São Domingos, PB, using a randomized block design
in a 4 × 2 factorial scheme, whose treatments resulted from the combination of four irrigation
shifts (1, 4, 8 and 12 days) and two concentrations of proline (0 and 10 mM), with four
replications, whose plot consisted of four useful plants, making a total of 128 experimental
units. The increase in watering shifts reduced gas exchange in sugar apple plants, 298 days after
transplanting. The application of proline at a concentration of 10 mM increased electrolyte
leakage in the leaf blade, stomatal conductance, chlorophyll a, totals and carotenoids, and
decreased the internal concentration of CO2 in sugar apple plants. The exogenous application
of proline at a concentration of 10 mM stimulated the biosynthesis of chlorophyll b, and the
increase in the fresh mass of fruits in plants cultivated under a 12-day irrigation shift.
