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Reproduccion asexual vegetal pdf

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Cuttings were prepared in 2 different seasons wet and dry and treated with different microclimatic conditions and auxin concentrations IBA and NAA. Hardwood and softwood cuttings of B. However, high hormone concentrations favored number, length of roots and number of developed shoots. Natural regeneration of these species is limited and the species are difficult to propagate from seeds.

Vegetative propagation of these species could be an alternative to get clonal planting stock for reforestation programs in some Mexico City areas.

Las estacas de madera lignificadas y madera suave de B. Exotic species have long been used for reforestation, but in many cases such species have produced undesirable ecological effects, because they can become invasive plants D'Antonio and Meyerson, However, since there is a lack of studies about most native species, it is necessary to increase our knowledge about plant propagation Reproduccion asexual vegetal pdf seeds or cuttings to introduce them to the ecosystem instead of exotic plants.

Because the first life stages are crucial for the establishment showing a high seedling mortality, it is very important to improve the use of native species vegetatively propagated, which have the advantage of Reproduccion asexual vegetal pdf these critical phases Weber and Stoney, ; Arriaga et al.

Biotecnología Vegetal - Micropropagación. Uploaded...

Due to urban development its surface has been drastically reduced in spite of its importance as a recharge area for the basin aquifers Ezcurra et al. Although some of the originally reported species are no longer found, new species to Reproduccion asexual vegetal pdf reserve have been reported, due to introduction of propagules in soil from other sites.

Local extinction of taxa is associated with urbanization and illegal extraction of ornamental species. One of the most conspicuous and abundant species in the reserve was Senecio praecox, an endemic species to the Pedregal, for this reason the vegetation of the Pedregal was called Senecionetum praecoxis by Rzedowski However, its relative abundance has been reduced due to competition with other species.

This change could be due to the low seed germination of S. In this way, Buddleja cordata, Dodonaea viscosa, Senecio praecox, and other Pedregal species could be reintroduced into the PSAR and other areas, at the same time this approach could improve the microenvironment for the establishment of the same and other plant species Arriaga et al.

This strategy could be used in the first steps of restoration programs, followed by the substitution of the vegetatively propagated individuals by saplings to avoid the reduction of genetic variability linked to vegetative propagation.

Dodonaea viscosa, is an evergreen species growing Reproduccion asexual vegetal pdf forest gaps, ravines and in altered land with irregular surface. It has also been considered a good species for reforestation due to its resistance to water deficit Degollado, Senecio praecox, a deciduous shrub or tree, is greatly appreciated for its landscape value due to its conspicuous flowers, which Reproduccion asexual vegetal pdf during the dry season.

These species are all native to, and dominant in, the PSAR. Additionally, plants in the urban environment "Reproduccion asexual vegetal pdf" an important role by mitigating extreme microclimates, collecting dust and gases from the air, and contributing to the recharge of aquifers Sanders, ; McPherson and Nowak, ; Barradas et al.

Therefore, these species, mainly S. We also determined optimum hormone types and concentrations to root the cuts of the studied species, which can be used as a basis for other studies. The Reserve's substrate is basaltic, and its topography very irregular Rzedowski, Mean annual temperature is Although some of the originally reported species are no longer found, new species have been reported, due to introduction of propagules in soil from other sites, and the Reproduccion asexual vegetal pdf diaspore dispersion from oak forests.

Species studied, and selected donor plants. Three plant species growing in the PSAR were selected for this study: Loganiaceae, Dodonaea viscosa Jacq. Sapindaceae, and Senecio praecox D. The donor individuals from each species were selected from areas outside the Reserve but with similar vegetation and environment, along the central road dividers, sidewalks, gardens and streets of the UNAM Campus.

Only those individuals that looked anatomically and morphologically healthy and vigorous were selected. Sixty individuals of each species were chosen and numbered according to their location in the area. These individuals were used to obtain the stem cuttings for all treatments. They were then labeled and placed in moist paper bags. Foliose softwood cuttings were made from lateral branches at 2 m from the soil surface.

Leaves of cuttings were cut when there were more than 5 leaves in order to reduce evaporation. Cuttings were hormone treated and sown immediately after cutting. The hormones used were: Pure IBA was placed in ml of alcohol and diluted with distilled water to get the concentrations required for each treatment, then cuttings were exposed to IBA immersing the tip Reproduccion asexual vegetal pdf 4 ml of solution, for the control group 4 ml of distilled water was used.

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