000			01562nam a2200181Ia 4500
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100			_aCairo P A R _cet al
245		0	_aSeasonal variation in the enzymatic activity of the source-sink system of rubber plants in a clonal garden
260			_bJournal of Rubber Research _c2015
300			_a139-147
500			_aSource Year: 2015
520			_aRibulose-1,5-bisphosphate carboxylase oxygenase (Rubisco) is a key enzyme in the reactions of CO2 assimilation in plants. Primary carbohydrates are converted into sucrose, which depends on the sucrose-P synthase (SPS) as a pivotal enzyme. In rubber tree, sucrose hydrolysis can occur intensively in the laticiferous cells of the stem and depends on the invertase (Inv) and sucrose synthase (SuSy) enzyme, producing reducing sugars, which are precursors of latex biosynthesis. The aim of this work was to evaluate seasonal changes in Rubisco, SPS, Inv and SuSy activities of rubber plants in a clonal garden (RRIM 600 and GT 1 clones), during warm/rainy and cold/dry seasons in Lavras, Minas Gerais, Brazil. The climatic differences in warm/rainy and cold/dry periods caused significant changes in all enzymatic activities evaluated. All enzymes had better performances in the warm/rainy period than in cold/dry. Enzymatic activities seemed to be more affected by temperature changes than by precipitation decrease.
650			_aEnzyme activities
650			_aHevea brasiliensis
650			_aSeasonal variation
650			_aSucrose metabolism
942			_cJS
999			_c68498 _d68498