Abstract
Seeking to understand the mechanisms of tolerance of melon plants under water deficit, this study aimed to evaluate the biochemical behavior of melon cultivars and the allocation of biomass under water deficit. Two experiments were conducted in a shaded environment in the experimental area of the State University of Bahia, Juazeiro / BA; the first was carried out in 2015 and the second in 2016. The experimental design was in randomized blocks, replicated three times, with subdivided plots; the plots consisted of four water application rates (50, 75, 100 and 125% of the crop evapotranspiration), the subplots of two melon cultivars 'Yellow' and 'Piel de Sapo'. The sub-subplots were the sampling periods: 15; 30 and 45 days after transplantation. In the first experiment it was evaluated: total soluble sugars, reducing sugars, total proteins. In the second experiment, in addition to biochemical analyzes, the allocation of biomass of leaves, branches, roots, fruits and root / shoot ratio was evaluated. At the end of both experiments, root proline and aerial part were evaluated. Both cultivars showed similar biochemical behavior, except for the accumulation of proline obtained in the cultivar 'Piel de sapo', which allowed greater biomass allocation to the fruit than the cultivar 'Amarelo'.
Highlights
The semi-arid region is characterized by drought, high temperatures and low relative humidity, which greatly limits agriculture, restricting cultivation to irrigated areas
Seeking to understand the mechanisms of tolerance of melon plants under water deficit, this study aimed to evaluate the biochemical behavior of melon cultivars and the allocation of biomass under water deficit
It is essential to carry out studies on the biochemical behavior and allocation of biomass for the fruit, in order to subsidize the choice of productive hybrids in conditions of water deficit, assisting in decision making on the amount of water to be use by the plant that does not have a marked impact reduction in growth, development and productivity of plant fruits
Summary
The semi-arid region is characterized by drought, high temperatures and low relative humidity, which greatly limits agriculture, restricting cultivation to irrigated areas. This biochemical adjustment may favor a greater allocation of biomass for fruit formation, allowing the plant to be more efficient in converting photo-assimilates under limited water conditions. The biochemical change of the melon is expect under conditions of water deficit; Based on this information, this study aims to evaluate biochemical variations throughout the cultivation cycle of two melon hybrids and biomass allocation under water deficit conditions in the São Francisco River valley, in the São Francisco sub-center
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