INVESTIGADORES
AIZEN Marcelo Adrian
artículos
Título:
Does pollen viability decrease with aging? A cross-population examination in Austrocedrus chilensis.
Autor/es:
AIZEN, M.A. Y A.E. ROVERE
Revista:
INTERNATIONAL JOURNAL OF PLANT SCIENCES
Editorial:
UNIV CHICAGO PRESS
Referencias:
Lugar: Chicago03; Año: 1995 vol. 156 p. 227 - 231
ISSN:
1058-5893
Resumen:
We scored the proportion of aborted pollen, age, and diameter at breast height of 78 male trees of the south-Andean dioecious conifer, Austrocedrus chilensis. Although the proportion of aborted pollen was low (range = 0.5%-7.8%), it increased significantly with tree age and size (r = .459 and .467 . respectively).The independent effects of these two variables could not be evaluated, however, because of the high colinearity between them. Tree reproductive effort and mean size of viable pollen, variables that could reflect resource availability and physiologícal stress, did not account for any significant part of the variation in the proportion of aborted pollen. Neither did the~ variables covary with tree age or size. To the extent that pollen abortion in this species is due to genetic causes, these results support a qualitative prediction of the "genetic load-with-age accumulation model", which asserts that pollen viability should decrease with agíng.