Male phenology and pollen production of<i>Cupressus sempervirens</i>in Tetouan (Morocco)

Aboulaich, Nadia; Bouziane, Hassan; Kadiri, Mohamed El; Riadi, Hassane

doi:10.1080/00173130802151700

Cited by 17 publications

(13 citation statements)

References 21 publications

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“…1E). A similar pattern has also been recorded for Cupressus sempervirens (Aboulaich et al 2008). The blooming period in C. deodara is about one month and follows high level of asynchronization among individuals in a population, which would affect the mating system by reducing the frequency of outcrossing and random mating within the population.…”

Section: Discussionsupporting

confidence: 85%

“…The flowering phenophases may go up to four months with the onset of pollen season between mid‐Sep to mid‐Oct. The long duration of the reproductive phenology could be due to dormancy during the immature phase of the cones (Aboulaich et al 2008) or due to high precipitation just after the initiation of male cones, as Jul and Aug is the rainy season in the western Himalayan region. It was also observed that after cessation of the rainy season, the cone development occurred very fast and within 12 days they began to bloom.…”

Section: Discussionmentioning

confidence: 99%

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Male and female reproductive phenology and annual production of male cones in two natural populations ofCedrus deodara

Khanduri¹,

Sharma²

2010

Nordic Journal of Botany

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Phenology of reproductive cones, microsporangium dehiscence and pollen production were studied in natural populations of Cedrus deodara at two different locations, the warmer Khirsu (1800 m a.s.l.) and the cooler Teka (1900 m a.s.l.) in the Pauri forest division of Garhwal Himalaya, India. The reproductive phenophases (cone bud initiation to pollination) goes up to four months with a blooming and pollination period of one month. The prolonged period of male cones during the immature phase was due to two months dormancy, and the dormancy, in turn, could be due to high precipitation during this phase. The pattern of opening of male cones was basipetal succession. Microsporangium dehiscence was dependent on air temperature and relative air humidity with a peak between noon and 2 pm. Flowering shows a high level of asynchrony among individuals within the population, leading to a possibility for geitonogamous selfing. Annual production of male cones varies greatly from one year to the next. A reduced number of pollen cones per tree in 2001 resulted in a decline in overall annual pollen production. In conclusion, the results revealed that the production of male cones represent only one factor that substantially influences the mating system, which will interact with the flowering phenology to influence the genetic composition of the population.

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Section: Discussionsupporting

confidence: 85%

Section: Discussionmentioning

confidence: 99%

Male and female reproductive phenology and annual production of male cones in two natural populations ofCedrus deodara

Khanduri¹,

Sharma²

2010

Nordic Journal of Botany

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“…The assumption being that each plume from the combined set of points will emit the same amount of pollen at each time step where the tree is estimated to release its pollen. The source strength of the individual points was estimated by using the shape and height of the tree, as proposed by Hidalgo et al (1999) and later used by Aboulaïch et al (2008). The dispersion profile for each plume therefore varied with the actual meterorological conditions such as wind speed, according to the Gaussian formulation.…”

Section: Modellingmentioning

confidence: 99%

Modelled and observed surface soil pollen deposition distance curves for isolated trees of Carpinus betulus, Cedrus atlantica, Juglans nigra and Platanus acerifolia

et al. 2017

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“…The proportion of a pollen-producing taxon in the vegetation of a particular region and the response of this taxon to weather conditions are the most important factors determining temporal variations in pollen concentrations in the atmosphere (Aboulaïch et al 2008; Guardia and Belmonte 2004; Jato et al 2007a, b; Sugita et al 2010). Knowledge of these relationships helps the interpretation of aerobiological data and allows the construction of more accurate models for predicting concentrations of allergenic pollen in the air.…”

Section: Introductionmentioning

confidence: 99%

The patterns of Corylus and Alnus pollen seasons and pollination periods in two Polish cities located in different climatic regions

Puc

Kasprzyk

2013

Aerobiologia

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This study compares phenological observations of Corylus (hazel) and Alnus (alder) flowering with airborne pollen counts of these taxa recorded using volumetric spore traps (2009–2011). The work was carried out in the Polish cities of Szczecin and Rzeszów that are located in different climatic regions. Correlations between pollen concentrations and meteorological data were investigated using Spearman’s rank correlation analysis. The timings of hazel and alder pollination and the occurrence of airborne pollen varied greatly and were significantly influenced by meteorological conditions (p < 0.05). The flowering synchronization of hazel and alder pollination in Szczecin and Rzeszów varied over the study period. Hazel and alder trees flowered notably earlier in stands located in places that were exposed to sunlight (insolated) and sheltered from the wind. On the other hand, a delay in the timing of pollination was observed in quite sunny but very windy sites. In Rzeszów, maximum hazel pollen concentrations did not coincide with the period of full pollination (defined as between 25 % hazel and alder and 75 % of flowers open). Conversely, in Szczecin, the highest hazel pollen concentrations were recorded during phenophases of the full pollination period. The period when the highest alder pollen concentrations were recorded varied between sites, with Rzeszów recording the highest concentrations at the beginning of pollination and Szczecin recording alder pollen throughout the full pollination period. Substantial amounts of hazel and alder pollen grains were recorded in the air of Rzeszów (but not Szczecin) before the onset of the respective pollen seasons.

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Male phenology and pollen production ofCupressus sempervirensin Tetouan (Morocco)

Cited by 17 publications

References 21 publications

Male and female reproductive phenology and annual production of male cones in two natural populations ofCedrus deodara

Male and female reproductive phenology and annual production of male cones in two natural populations ofCedrus deodara

Modelled and observed surface soil pollen deposition distance curves for isolated trees of Carpinus betulus, Cedrus atlantica, Juglans nigra and Platanus acerifolia

The patterns of Corylus and Alnus pollen seasons and pollination periods in two Polish cities located in different climatic regions

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