LACERDA, F. H. D.; http://lattes.cnpq.br/0758921014619111; LACERDA, Francisco Hélio Dantas.
Abstract:
The área explored with watermelon in the semiarid northeast is
irrigated in almost your totality. Irrigation in these regions has been identified as an
alternative to the socio-economic development, although when used improperly can
promote soir salinization and degradation of water and soil resources. Therefore, the
aim of this work to evaluate the effect of exogenous application of proline in the
growth, physiology and yield of watermelon irrigated with saline water. The
experiment was carried out at the Centro de Ciências e Tecnologia Agroalimentar
(CCTA/ UFCG) - Pombal - PB, in the throughout of lO/16/2011 to 12/19/2011, using
the hybrid watermelon 'Quetzali'. The treatments consisted of two leveis of salinity of
irrigation water (0.3 and 4.0 dS m'l) and ave concentrations of proline (0, 5, 10, 15
and 20 mmol L'l) applied in the leaf in watermelon. The experimental design was a
randomized block in factorial scheme 2 x 5, with four replications. The highest values
regarding of plant growth, physiological parameters and yield in watermelon are seen
in the salinity of 0.3 in relation to 4.0 dS m'l. The supply of proline was effective in
reducing stress responses in watermelon caused by salinity of irrigation water up to
the concentration of 8.51 mmol L'l proline. The increase in fruit yield provided by the
concentrations l0.74 and 8.51 mmol L'l in relation to concentration 0 mmol L'l
proline was 31 .08%, when irrigated with normal water (0.3 dS m'l) and 17.03% when
irrigated with saline water (4.0 dS m''). In absolute terms we can say that the best
performance of watermelon was obtained at concentrations of 10.0 mmol L'l proline
for plants irrigated with water of normal irrigation (0.3 dS m'l) and 5.0 mmol L' l of
proline for plants irrigated with saline irrigation water (4.0 dS m'1).