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Karyotypic studies in Turnera sidoides complex (Turneraceae, Leiocarpae)
Viviana G Solís Neffa1, Aveliano Fernández
1Instituto de Botánica del Nordeste (UNNE-CONICET), Casilla de Correo 209, 3400 Corrientes, Corrientes Province, Argentina;
American Journal of Botany
|June 14, 2011
Summary
This study reveals that Turnera sidoides exhibits varying ploidy levels, supporting autopolyploidy. Chromosome analysis also suggests rearrangements are key to its evolutionary divergence.
Area of Science:
- Plant genetics
- Evolutionary biology
- Cytogenetics
Background:
- Turnera sidoides is a complex of perennial herbs with the southernmost distribution in America.
- Understanding its genetic diversity and evolutionary history is crucial for its conservation and taxonomic classification.
Purpose of the Study:
- To describe the karyotypes of the five subspecies of Turnera sidoides for the first time.
- To investigate the role of polyploidy and chromosomal rearrangements in the evolution of T. sidoides.
Main Methods:
- Analysis of root-tip mitotic metaphases to determine karyotypes.
- Comparison of karyotype data with existing meiotic and biosystematic information.
Main Results:
- Karyotypes of all five subspecies of T. sidoides were characterized, revealing diverse ploidy levels from diploid to octoploid.
- The findings support the hypothesis of autopolyploidy within the T. sidoides species complex.
- While karyotypes showed intraspecific uniformity, variations in satellite number, type, and position were observed, indicating potential chromosomal rearrangements.
Conclusions:
- Autopolyploidy is a significant factor in the evolution of Turnera sidoides.
- Chromosome rearrangements likely play a role in the karyotypic evolution and differentiation of subspecies.
- The karyotype data, along with morphological and anatomical features, suggest reclassifying T. sidoides out of series Leiocarpae.
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01:17Karyotyping
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01:17Karyotyping
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02:38Asexual Reproduction
Asexual reproduction allows plants to reproduce without growing flowers, attracting pollinators, or dispersing seeds. Offspring are genetically identical to the parent and produced without the fusion of male and female gametes.
02:04Polytene Chromosomes
Polytene chromosomes are giant interphase chromosomes with several DNA strands placed side by side. They were discovered in the year 1881 by Balbiani in salivary glands, intestine, muscles, malpighian tubules, and hypoderm of larvae Chironomus plumosus. Hence, these are also called "Salivary gland chromosomes." These are found in insects of the order Diptera and Collembola; in certain organs of mammals; and synergids, antipodes of flowering plants. Polytene chromosomes are also regularly...
02:04Polytene Chromosomes
Polytene chromosomes are giant interphase chromosomes with several DNA strands placed side by side. They were discovered in the year 1881 by Balbiani in salivary glands, intestine, muscles, malpighian tubules, and hypoderm of larvae Chironomus plumosus. Hence, these are also called "Salivary gland chromosomes." These are found in insects of the order Diptera and Collembola; in certain organs of mammals; and synergids, antipodes of flowering plants. Polytene chromosomes are also regularly...
02:27Trihybrid Crosses
Trihybrid Crosses
Some of Mendel’s crosses examined three pairs of contrasting characteristics. Such a cross is called a trihybrid cross. A trihybrid cross is a combination of three individual monohybrid crosses. For example, plant height (tall vs. short), seed shape (round vs. wrinkled), and seed color (yellow vs. green).
The F1 generation plants of a trihybrid cross are heterozygous for all three traits and produce eight gametes. Upon self-fertilization, these gametes have an equal chance to...
Some of Mendel’s crosses examined three pairs of contrasting characteristics. Such a cross is called a trihybrid cross. A trihybrid cross is a combination of three individual monohybrid crosses. For example, plant height (tall vs. short), seed shape (round vs. wrinkled), and seed color (yellow vs. green).
The F1 generation plants of a trihybrid cross are heterozygous for all three traits and produce eight gametes. Upon self-fertilization, these gametes have an equal chance to...