GENETIC VARIABILITY FOR SPEED OF GERMINATION IN BEAN (Phaseolus vulgaris L.) SEEDS
Abstract
This work was designed to investigate the possible existence of genetic variability for speed of germination in bean seeds. Hundred and one genotypes, three of them green beans and the remainder dry beans, were evaluated in greenhouse. Greenhouse produced seeds were sowed in plastic boxes at depths of 2.5 and 8.0 cm. A randomized complete block design with two replications and six seeds per plot, was performed. Analysis of speed of germination, evaluated through an Emergente Index, indicated significant differences for seed placement depth and no significant differences for seed placement depth x cultivar interaction. A superior group comprised 98 genotypes. whereas the inferior one, comprised the three others, two of which are green bean types. The conclusions are: low variability was detected for the character germination speed within this germplasm; green beans might be improved; germplasm collected from different locations presented different • behavior suggesting that natural selection might act differently in different environments.
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