Does Pollen Viability Decrease with Aging? A Cross-Population Examination in Austrocedrus chilensis (Cupressaceae)

Aizen, Marcelo A.; Rovere, Adriana E.

doi:10.1086/297244

Cited by 16 publications

(13 citation statements)

References 11 publications

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“…As in P. misera, more than one pollen grain size classes were encountered in the same anther of several Caryophylloideae but, unlike Passiflora, number of grains in each size class was dissimilar (Jürgens & al., 2012). A bimodal pollen size distribution with the larger grains viable and the smaller ones aborted was also detected in a conifer (Aizen and Rovere, 1995). In the species with two pollen size classes, in which the smaller ones are not vital, the useful P/O ratio would be minor than the estimated one, nearly the half in the examined Passiflora species.…”

Section: P/o Pollen Grain Size Pollen Vitality and Breeding Systemmentioning

confidence: 79%

Pollen: ovule ratio and its relationship with other reproductive traits in some <em>Passiflora</em> species (Passifloraceae)

García¹,

Miguez²,

Gottsberger³

2014

Anal. Jard. Bot. Madr.

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Amela García, M.T., Miguez, M.B. & Gottsberger, G. 2014. Pollen: ovule ratio and its relationship with other reproductive traits in some Passiflora species (Passifloraceae). Anales Jard. Bot. Madrid 71(2): e009.The pollen/ovule (P/O) ratio has been used as predictor of the reproductive system of angiosperms (lowest P/O values correspond to obligate autogamous species while the highest correlate with obligate xenogamous species) but it does not keep for all the taxa. The relation of P/O index with pollen and stigma size, flower diameter, pollen vitality, stigmatic area/pollen-bearing area of the pollinators ratio (SA/PBA), taxonomy and breeding system was analyzed in four Passiflora species with different degree of compatibility, pollination system and taxonomic placement. P/O of the self-compatible species (with shorter anthesis, scarce pollinator visits or minor longevity) was lower than P/O of the selfincompatible ones. The P/O values of the outcrossers could be related with the highly efficient pollination performed by the frequently visiting Xylocopa species; these bees transport Passiflora pollen in a usually monospecific mass on the thorax, resembling grouped pollen dispersal. All the taxa exhibited pollen with unimodal size and high vitality, except for P. misera, in which pollen size was bimodal, with similar quantities of grains in both classes, the large being more vital than the small ones. Correlations of P/O were positive with flower size, negative with stigma area/pollen-bearing area of the pollinator, null with stigma area and not significant with pollen size. The P/O ratio did not reflect taxonomic affinities; this index and the breeding system were more related with pollinator type, anthesis, flower size and SA/PBA than with pollen grain or stigma size.Keywords: pollen size, pollen vitality, breeding systems, flower size, stigma area, pollen-bearing area, pollinators, anthesis, plant longevity, sexual system. ResumenAmela García, M.T., Miguez, M.B. & Gottsberger, G. 2014. El índice polen/óvulos y su relación con otros rasgos reproductivos en varias especies de Passiflora (Passifloraceae). Anales Jard. Bot. Madrid 71(2): e009.La utilidad del índice polen/óvulos (P/O) para predecir el sistema reproductivo de las Angiospermas (los valores más bajos corresponden a especies autógamas obligadas mientras que los valores más altos a especies xenóga-mas obligadas) no siempre ocurre. Analizamos la relación del P/O respecto del tamaño del polen y estigma, diámetro floral, viabilidad polínica, proporción área estigmática/área de acarreo del polen por los polinizadores, la taxonomía y el sistema reproductivo en cuatro especies de Passiflora con grado de compatibilidad, polinizadores y posición taxonómica distintos. El P/O de las especies auto-compatibles (con antesis más corta, polinizadores infrecuentes o menos longevidad) fue menor que el de las auto-incompatibles. Esto estaría relacionado con la polinización altamente eficiente que realizan asiduamente Xylocopa spp., transportando polen de Passifl...

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Section: P/o Pollen Grain Size Pollen Vitality and Breeding Systemmentioning

confidence: 79%

Pollen: ovule ratio and its relationship with other reproductive traits in some <em>Passiflora</em> species (Passifloraceae)

García¹,

Miguez²,

Gottsberger³

2014

Anal. Jard. Bot. Madr.

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“…Individual differences in pollen viability have also been found in other tree species-for example, Pinus sylvestris (Scholz et al 1985;Venne et al 1988), Abies alba (Kormutak et al 1994), Austrocedrus chilensis (Aizen and Rovere 1995) or Picea abies (Nikkanen et al 2000)-and can therefore be expected to be found in Q. robur as well. Future studies should therefore concentrate on pollen-mediated gene flow with respect to single-tree variations in pollen viability and sensitivity to sunlight for a better understanding of the reproductive system of tree populations.…”

Section: Simulated Pollen Dispersal Patternmentioning

confidence: 89%

Viability and sunlight sensitivity of oak pollen and its implications for pollen-mediated gene flow

Schueler

Schlünzen²,

Scholz

2004

Trees

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Pollen-mediated gene flow and the male reproductive success of wind-pollinated trees depend on the initial viability of the pollen and the changes that occur in its viability during transport in the atmosphere. The viability of Quercus robur pollen was determined before and during exposure to sunlight by in vitro germination and the fluorescein diacetate reaction (FCR) in 2002 and 2003, respectively. These experiments allowed us to calculate initial pollen viability and pollen sensitivity to sunlight. The germination test revealed a lower initial pollen viability (25-65%) than the FCR (53-92%). Following 9.5 h of irradiation the viability was reduced to 75-100% as determined by the in vitro germination test or to 40-70% as determined by the FCR. The actual values of initial pollen viability and pollen sensitivity to sunlight were used to define a range of values for modelling pollen dispersal using the mesoscale meteorological model METRAS. The deposition patterns of viable pollen varied by as much as a factor of 14 by changing the viability parameters in the range of the observed values. This suggests significant differences in male reproductive success. Variations in initial pollen viability have stronger effects on the gene-flow pattern than do variations in pollen sensitivity to sunlight. In particular, This revised version was

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“…Recessive mutations at any locus, and dominant mutations in loci relevant &&only'' for roots, stem development or the sexual reproduction, are included in this category. Genetic load was measured empirically, and shown to be signi"cantly larger in old trees compared to young ones of the same species (Aizen & Dovere, 1995), and in long-living plants compared to non-related short-living ones (Klekowski & Godfrey, 1989).…”

Section: Case I a Neutral}negative Mutationmentioning

confidence: 99%

A Conflict Between Two Evolutionary Levels in Trees

Hadany

2001

Journal of Theoretical Biology

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Does Pollen Viability Decrease with Aging? A Cross-Population Examination in Austrocedrus chilensis (Cupressaceae)

Cited by 16 publications

References 11 publications

Pollen: ovule ratio and its relationship with other reproductive traits in some <em>Passiflora</em> species (Passifloraceae)

Pollen: ovule ratio and its relationship with other reproductive traits in some <em>Passiflora</em> species (Passifloraceae)

Viability and sunlight sensitivity of oak pollen and its implications for pollen-mediated gene flow

A Conflict Between Two Evolutionary Levels in Trees

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