Quebra de dormência na semente de feijão nhemba silvestre - vigna unguiculato(l)walp

Abstract

Vigna unguiculata wild is very important for the improvement of cultivated cowpea, due to its genetic potential, however its genetic potential is conditioned by the presence of dormancy effect caused by the hardness of its seeds. The study carried out in this work, in addition to comparing the dormancy effect in different populations of vigna unguiculata, a semi-wild population and a cultivated variety, also sought to identify effective methods for wild vigna unguiculata, through laboratory tests. The semesters of the cultivated variety germinated completely and quickly within a week and therefore showed no dormancy. The semi-wild population had a similar behavior, although 5% of the seeds did not germinate. The three wild populations showed a slow and delayed germination, which indicates the dormancy effect. Seeds from var. pubescens for the dormancy break tests. The results obtained showed the manual scarification method as the most effective in breaking dormancy, having managed to obtain 97% for the untreated seed. With the seed treatment with concentrated sulfuric acid, rapid germination was also obtained with the longest treatment time of 12 minutes: 94% was the germination obtained within 8 days, compared to 19% for the untreated seed. Seed treatment, for a variable period with hot water at 70c, was the least effective method for dormancy.