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Botanical Sciences
versión On-line ISSN 2007-4476versión impresa ISSN 2007-4298
Resumen
ALVAREZ-ALVAREZ, Jonathan; VAZQUEZ-SANTANA, Sonia y GARCIA-CAMPUSANO, Florencia. Mating and breeding systems in Echeveria strictiflora and Echeveria subalpina (Crassulaceae) for ex situ propagation and conservation. Bot. sci [online]. 2021, vol.99, n.4, pp.807-822. Epub 18-Oct-2021. ISSN 2007-4476. https://doi.org/10.17129/botsci.2803.
Background:
Floral and reproductive attributes influence the capacity of plants to produce gametes, the efficiency of pollen transfer, the development of viable seeds, and the recruitment of new individuals.
Question:
What morphological attributes characterize sexual whorls in E. strictiflora and E. subalpina? Do intra and interspecific mating systems impact on seed production and germinability?
Studied species:
Echeveria strictiflora and Echeveria subalpina.
Study site:
In ex situ conditions in Mexico City from 2018 to 2020.
Methods:
The spatial position and arrangement of the sexual whorls were described. The morphology of pollen grains and ovules were characterized by optical and scanning electron microscopy. The intra- and interspecific outbreeding and mating systems, as well as the production and germination of seeds were determined under controlled conditions.
Results:
Both E. strictiflora and E. subalpina are herkogamous, have a mixed breeding system, and produce seeds by reciprocal hybridization. Abundant viable pollen and ovules are produced. Species are self-compatible, however, the reduction in the production and viability of the seeds produced by selfing, suggests that there is a detrimental effect due to inbreeding depression.
Conclusions:
E. strictiflora and E. subalpina produce fruits and seeds by selfing and intra- and inter-specific outbreeding, but inbreeding depression limits recruitment, revealing the importance of conserving populations with sufficient individuals to retain diversity, as well the areas of natural distribution.
Palabras llave : Floral biology; inbreeding depression; Echeveria; hybridization; outbreeding; sexual reproduction.