Effect of Seed Coat Color on Imbibition, Germination and Seed Structure of Crotalaria juncea (Fabaceae)
Keywords:
Episperm, endosperm, embryo, germination, imbibitionAbstract
Beltramini, Verónica S.; Ana L. Pascualides. 2017. “Effect of seed coat color on imbibition, germination and seed structure of Crotalaria juncea. (Fabaceae)”. Lilloa 54 (2). Crotalaria juncea L. is a subtropical herbaceous legume native of India and Pakistan. The seeds have polychromy in the seed coat. Studies on seed coat color that link the internal structure of Crotalaria juncea seed with imbibition and germination capacity are scarce. The aim of this work was to study the effect of seed coat colors on imbibition, germination, and seed components. The proportion of each component of the seed (seed coat, endosperm and embryo) and the amount of water absorbed for each one of them, the thickness of the seed coat and endosperm, the percentage of germination and emergence in the field of uniform and variegated seeds were evaluated. There were no significant differences in the proportions of the seed coat, endosperm and embryo between the two seed coat colors. Variegated seeds retained a higher percentage of water in the seed coat while uniform ones did it in the endosperm. The percentage of water retained the embryo was similar in both seed groups. Uniform seeds presented an advantage over variegated ones because in the first the highest percentage of water is absorbed by the endosperm, whose aleurone layer was thicker, which would promote embryo hydration for the start of germination. In variegated seeds, the high- est percentage of water was found in the seed coat, where macrosclereids and parenchyma layers were thicker than in uniform seeds. The uniform seeds showed a high percentage of germination in the laboratory and a better behavior in the field that the variegated ones.
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