Histochemical changes in the seed coats structure of three species of Abelmoschus (Medik.) under different moisture content levels
2007
Villavicensio, M.L.H. | Altoveros, N.C. | Borromeo, T.H.
The seed coat structures of 3 species of Abelmoschus were investigated through histochemistry and light microscopy to determine the nature and localization of chemical compounds present and explain the role of the different compounds on hardseededness and seet coat impermeability. Results showed the presence of lignins and phenols, both with hydrophobic characters, as proven by earlier work in the mesophyll layer of the hilar region and the palisade layer of the seed coats of A. esculentus, A. moschatus, and A. tetraphyllus var. pungens at 5%, 9% and 13% moisture content. Tannins and lipids were found in the transition part of the palisade layer and in the mesophyll with amount increasing at low seed moisture content in the transition part of A. esculentus. The presence of these compounds may contribute to hardseededness and impermeability of the seed coat.
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