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1 September 2011 Effect of Gibberellic Acid on Germination of Seeds of Five Species of Cacti From the Chihuahuan Desert, Northern Mexico
Mariana Rojas-Aréchiga, Karla Ma. Aguilar, Jordan Golubov, María C. Mandujano
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Abstract

We determined the effect of three concentrations of gibberellic acid on germination and photoblastic behavior of five species of Opuntioideae from the Mapimi Biosphere Reserve, southern Chihuahuan Desert, Durango, Mexico. For Cylindropuntia imbricata, addition of high concentrations (1,500 ppm) of gibberellic acid gave a 30% germination similar to the control; for Opuntia rastrera, medium concentrations (1,000 ppm) gave <40% germination; and for O. microdasys, low concentrations (500 ppm) gave 35% germination. High concentrations restricted germination. Opuntia macrocentra and Cylindropuntia leptocaulis did not differ significantly from the control. Opuntia macrocentra required light for germination; addition of gibberellic acid did not substitute for light. For all species, light increased germination and the effect of gibberellic acid is species dependent, rarely better than the control. Species we studied did not seem to have physical dormancy and may have had physiological dormancy that was unaffected by gibberellic acid.

Mariana Rojas-Aréchiga, Karla Ma. Aguilar, Jordan Golubov, and María C. Mandujano "Effect of Gibberellic Acid on Germination of Seeds of Five Species of Cacti From the Chihuahuan Desert, Northern Mexico," The Southwestern Naturalist 56(3), 393-400, (1 September 2011). https://doi.org/10.1894/N01-DW-126.1
Received: 4 September 2008; Accepted: 1 April 2011; Published: 1 September 2011
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