Differentiation in seed germination among populations of Capsicum annuum along a latitudinal gradient in Mexico
Por:
Hernández-Verdugo S., Oyama K., Vázquez-Yanes C.
Publicada:
1 ene 2001
Resumen:
To investigate variation in germination capability of wild Capsicum annuum seeds, the effects of light, fluctuating temperature, gibberellic acid (GA), soaking and sulfuric acid were analyzed in samples from 14 populations from northwest Mexico. Germination was inhibited by darkness in all populations studied. Darkness inhibition of germination was overcome by fluctuating temperature and GA, factors which also increased germination percentage but not germination rate. Soaking treatments did not significantly increase germination of C. annuum seeds, while sulfuric acid treatments had negative effects on the process. Populations showed high variation in germination response in all treatments, except for continuous darkness. Principal component analysis differentiated some populations with high germination percentage and slow germination rate. Such differences did not correlate with climatic variables from collection sites. Given the variation in germination patterns observed, some of these totally contrasting, we have to be cautious when considering the results of studies based on a single wild population.
Filiaciones:
Hernández-Verdugo S.:
Facultad de Agronomia, Universidad Autonoma de Sinaloa, Km 27, Carretera Culiacan-El Dorado, Sinaloa, Mexico
Oyama K.:
Instituto de Ecologia, UNAM, Apdo., Postal 70-272, 04510, Mexico, D.F., Mexico
Vázquez-Yanes C.:
Instituto de Ecologia, UNAM, Apdo., Postal 70-272, 04510, Mexico, D.F., Mexico
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