Resumen

HERMOSILLO GONZALEZ, Yolanda et al. Inductive methods to maximize the germination of native germplasm seed in a greenhouse for agroforestry systems in Nayarit, Mexico. Zootecnia Trop. [online]. 2008, vol.26, n.3, pp.355-358. ISSN 0798-7269.

For most legumes and other endemic plants for animal consumption, seed requires scarification methods and induction with giberilic acid (AG₃), to obtain greater germination and growth of plants in the early stages. The objective of the study was to evaluate methods to improve germination on seeds of guaje (Leucaena leucocephala), guajillo (Leucaena lanceolota), catispa (Gliricidia sepium), guacima (Guazuma ulmifolia), and capomo (Brosimum alicastrum) under 65% of shade with mesh. The study was located in a temperate subtropical climate with rains in summer, average precipitation annual 1,283 mm and average temperature annual 24ºC. Seeds of high vigor were collected and selected during the low water in localities of the entity. After 30 d of the collection, seed planting was done in a culture box, with a substrate made of sugar cane residues, sawdust, and pumice stone (1:1:0.5). A completely randomized design with eight treatments and three repetitions was used. The results of the variance analysis showed significant differences (P>0.05) among treatments. The highest germination was observed in seeds exposed to 75ºC for 30 sec and water soaking at 18ºC for 24 h with AG₃ dose from 600 to 2,300 mg/L, and significantly higher (P>0,05) than the other treatments. The control treatment resulted with the smallest amount of germinated seed and the maximum germinative capacity of the species appeared between 3 and 10 d. Plants with doses from 2,300 to 300 mg/L of AG₃ started stems, leaves, and roots elongation in all species, although there was a lag when change to plastic pots for establishment.

Palabras clave : scarification; giberelic acid; germination; greenhouse.

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