Germination, vegetative growth and floral morphology of Dasylirion cedrosanum from the rosetophyllous scrub of Coahuila
DOI:
https://doi.org/10.29059/cienciauat.v18i1.1772Keywords:
Dioecy, caudex, inflorescence, flowering, imbibition phasesAbstract
Sotol (Dasylirion cedrosanum Trel.), endemic species of northeastern Mexico, has attracted economic and social interest due to its commercial potencial. The objective of this work was to characterize the germination, vegetative growth and floral morphology of D. cedrosanum from the rosetophyllous scrub of Coahuila. Three batches of 100 seeds were submitted to an imbibition process and the germination percentage was recorded. The characterization of the germination was carried out on the seedlings grown in the laboratory, while the vegetative morphology was determined in adult plants taken from a botanical garden, with a known planting date and which were not given a crop management. The description of the floral morphology was carried out on wild plants from the San Lorenzo canyon, near the municipality of Saltillo, Coahuila, Mexico. The imbibition showed the first phase of absorption within 48 h, with an increase of 52 % in weight. The third phase began at 96 h with an increase of 55 % in weight. The seeds emitted the hypocotyl from the fifth day. On the tenth day 98 % germination was obtained. Among the distinctive morphological characteristics of the species, the inflorescences, known as “floral scapes”, recorded an average height of 3.39 m. The flowers were actinomorphic and unisexual. The staminate flower presented perianth without differentiation of tepals and sepals, while the pistillate flowers showed pedicels and a short receptacle. The pollen was elliptical, with a monosulcate opening, with a dimension of 15 mm x 30 mm. The fruits were dry and indehiscent, known as samara. The seeds were turbinated with a trigonal contour. The germination and characteristics of the sotol corresponded to adaptations that allow it to grow in the semi-arid environment of this region of the country.
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