Effect of light on germination of seven species of cacti from the Zapotitlán Valley in Puebla, México |
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| Authors: | Mariana Rojas-Aréchiga Alma Orozco-Segovia Carlos Vázquez-Yanes |
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| Institution: | Mariana Rojas-Aréchiga, Alma Orozco-Segovia,Carlos Vázquez-Yanes |
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| Abstract: | Seed germination of seven species of cacti from Zapotitlán Valley, Puebla, Mexico, were compared at four different light treatments (red light, far-red light, white light and darkness) at a constant temperature of 25°C, and at two light treatments (white light and darkness) at two fluctuating temperatures (15–30°C and 20–30°C). Results allowed us to divide the studied species into two groups: positive photoblastic and indifferent to light. Positive photoblastics were barrel cacti and indifferent to light species were columnar cacti. Although barrel cacti had a light requirement for germination, they germinated in far-red light. Probable relationships among life-form, species distribution and light requirements for germination are discussed. |
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| Keywords: | germination cacti deserts photoblastism Puebla Mé xico |
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