Collectanea Botanica, Vol 33 (2014)

Características palinológicas de las subspecies de Linum mucronatum Bertol. con heterostilia


https://doi.org/10.3989/collectbot.2013.v33.004

S. M. Talebi
Department of Biology, Faculty of Sciences, Arak University, Irán, República Islámica de

F. Farahani
Faculty of Biological Sciences, Shahid Beheshti University, Irán, República Islámica de

M. Sheidai
Faculty of Biological Sciences, Shahid Beheshti University, Irán, República Islámica de

Z. Noormohammadi
Department of Biology, School of Sciences, Science and Research Branch, Islamic Azad University, Irán, República Islámica de

Resumen


Linum mucronatum es una especie con heterostilia, que pertenece a la sección Syllinum del género Linum, y tiene cuatro subespecies en Irán. En el presente estudio se examinan las características palinológicas de las subespecies heterostilas de Linum mucronatum Bertol., así como los caracteres polínicos de individuos de los morfos brevistilo (pin) y longistilo (thrum) de estas plantas, mediante microscopía electrónica de scanning y microscopía óptica usando el método de acetolisis prolongada. Se estudiaron un total de 16 caracteres cualitativos y cuantitativos. La forma ecuatorial del polen varía entre los morfos pin y thrum en todas las subspecies, excepto en L. mucronatum subsp. assyriacum. La ornamentación también varía entre las muestras de morfos pin y thrum de cada subespecie, en los que se puede observar polen gemado, clavado y baculado. En algunos caracteres palinológicos cuantitativos, se encontraron también diferencias entre morfos y el test de ANOVA muestra que son significativas en cuanto a la longitud ecuatorial, la anchura de los colpos y el diámetro del apocolpio. Los individuos heterostilos de cada susbespecie aparecen separados en el árbol UPGMA y también en los gráficos de PCO y PCA. Este estudio confirma las diferencias en las características del polen entre individuos pin y thrum de cada una de las subespecies.

Palabras clave


características polínicas; heterostilia; individuos thrum/pin; Linum mucronatum

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