VIABILITY AND IMBIBITION TIME EFFECT ON Rhodophiala mendocina GERMINATION AND MORPHOPHYSIOLOGICAL DORMANCY.

ZARAGOZA PUCHOL, J. D.; FERESIN, G.E.

Merlo, San Luis. 6 -7. Diciembre de 2017

Congreso; XXXV Reunión Anual de La Sociedad de Biología de Cuyo.; 2017

Sociedad de Biologia de Cuyo

The interest in native ornamental plants promotes prospecting and domestication studies. Amaryllidaceae family multiplication rate is low. Seeds are a good propagation material to preserve genetic diversity. In Argentina, seed propagation of other Amaryllidaceae species (Zephyranthes mesochloa, Rhodophiala bifida and Habranthus tubispathus) was studied. Previous studies with R. mendocina seeds showed that the best conditions to germination were 25-15 °C with imbibition (24 hs). The aim was to evaluate viability and imbibition times effects, in R. mendocina (Phil.) Ravenna morphophysiological dormancy. In December 2016, R. mendocina seeds (after ripening fruits) were collected of natural populations from Caucete dunes, San Juan, Argentina. Then, they were disinfected (70% ethanol), washed with sterile distilled water, and put on germination paper, and conducted to germination chamber (20 days, alternanting temperatures 25°C/16 hours (light) and 15°C/8 hours (dark). The percentage (% G), velocity (VG), and germination energy (EG) were analyzed. A randomized design with five replicates and two treatments: viability (1, 15, 30 and 45 days after collection), and imbibition time (0, 1, 3, 5 and 7 days) were applied. The results were analyzed by ANOVA and Tuckey test. Significative (p