A study was carried out with tropical fruit germoplasm (Hancornia speciosa Gomes) to evaluate "in loco" water relations and their respectives correlations in four acesses (M-UFRPE 1, M-UFRPE 2, M-UFRPE 3 and M-UFRPE 4) cultivated at the coastal region, in Brazil. The datas were taken from fully expanded adults leaves. Two treatments were studied: leaves fully exposed to the sun and shadow leaves. The following characters were analized: leaf temperature (Tf), transpiration (E) and diffusive resistance (Rs). The shadow leaves of the M-UFRPE 2 showed higher transpiration rate than fully exposed leaves to the sun. This behaviour was different compared to the other treatment. The variation between fully exposed leaves to the sun and shadow leaves for Rs was 1.1 to 4.5s.cm-1 and 1.7 to 3.5s.cm-1, respectively. The ExRs correlation was more significant and negative. The Tf and E correlation was longer influenced by relative humidity than photosynthetically in fully exposed leaves to the sun treatment.
tropical fruits; water deficit; diffusive resistance; transpiration
