[Seeds latency of Stylosanthes hamata (Leguminosae) and its relation with morphology of the seed-coat].
The seed of Stylosanthes hamata is characterized by it's a high level of dormancy, which is imposed by seed-coat impermeability to water entry (harseededness or hard-seed condition). The level of hardseededness between upper and lower articulations of seven diploid and five tetraploid accessions was studied under tropical conditions. Germination tests on naked seeds (relative humidity: 55-65%, constant temperature: 27-30 degrees C, photoperiod: 12/12 hr) showed that hard-seed percentage was, in most cases, over 85% independent of ploidy level and seed position within the fruit. Histochemical analysis indicated that hardseededness in this species was associated with a completely sealed microphile and hilum. This feature was also associated to: a) an epidermis consisting of a palisade-like layer of macrosclereids, b) a like-line at the outermost region of these cells and c) a high concentration of hydrophobic compounds located all across the seed-coat.
Castillo
R
R
Universidad Simón Bolívar, Departemento de Estudios Ambientales, Apartado postal 89000, Caracas 1080, Venezuela. rosanacastillo@hotmail.com
Guenni
O
O
D002980:Climate; D007887:Fabaceae / Q000502:physiology*; D006813:Humidity; D012639:Seeds / Q000033:anatomy & histology* / Q000737:chemistry / Q000502:physiology*