YIELD, PHYSIOLOGICAL QUALITY AND CHEMICAL COMPOSITION OF PHASEOLUS VULGARIS SEEDS, PRODUCED IN THE STATE OF RIO GRANDE DO SUL, BRAZIL

Abstract

The objective of this study was to evaluate the yield and physiological quality of bean seeds in two agricultural crops, and the chemical composition of seedlings submitted to adverse temperatures during germination. For the field experiment, a randomized block design was used, using five genotypes, BRS Embaixador, IPR Tuiuiú, Guabiju, Carioquinha and Mouro, arranged in four replicates. The experimental units were composed of five lines with five meters in length, where 25 plants were randomly collected per experimental unit to measure the characters of interest. For laboratory testing the seeds produced were submitted to three temperatures (15, 25 and 35°C) during germination under controlled conditions. The evaluated characters were: grain yield, mass of a thousand seeds, germination, first germination count, starch content, soluble sugar, soluble protein and total amino acids. The data were submitted to analysis of variance and later compared by the Tukey test. Yield per plant revealed changes between the agricultural crops, as well as among the genotypes tested. Germination and the first germination count revealed higher magnitudes in seeds produced by BRS Embaixador, IPR Tuiuiu and Carioquinha genotypes. For all genotypes, protein and amino acid levels were higher in seedlings submitted to lower temperatures. The levels of starch and total soluble sugars were higher in seedlings produced at 35°C. Yield, seed physiological quality and chemical composition of seedlings are influenced by the crop and genotypes tested.