Meiotic irregularities in Alstroemeria andina var. venustula (Alstroemeriaceae)

Alstroemeria andina Phil. var. venustula (Phil.) M. Muñoz (sub nom. A. andina Phil. subsp. venustula (Phil.) Ehr. Bayer) is a perennial, small herb, 5-16 cm tall, that occurs mainly at 2,800-3,700 meters above sea level, in populations of limited distribution from Argentina and Chile. The course of...

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Detalles Bibliográficos
Autores principales: Sanso, A.M., Wulff, A.F.
Formato: JOUR
Materias:
Alstroemeriaceae
Chromosomes
Cryptochiasmate meiosis
Meiotic behaviour
Pollen staining
Structural heterozygosity
Alstroemeria
Alstroemeria andina
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_1817406X_v48_n3_p311_Sanso
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_1817406X_v48_n3_p311_Sanso2023-10-03T16:33:02Z Meiotic irregularities in Alstroemeria andina var. venustula (Alstroemeriaceae) Sanso, A.M. Wulff, A.F. Alstroemeriaceae Chromosomes Cryptochiasmate meiosis Meiotic behaviour Pollen staining Structural heterozygosity Alstroemeria Alstroemeria andina Alstroemeriaceae Alstroemeria andina Phil. var. venustula (Phil.) M. Muñoz (sub nom. A. andina Phil. subsp. venustula (Phil.) Ehr. Bayer) is a perennial, small herb, 5-16 cm tall, that occurs mainly at 2,800-3,700 meters above sea level, in populations of limited distribution from Argentina and Chile. The course of the meiosis was analyzed in a population of this taxon (2n = 2x = 16), and it proved to be highly irregular. It was characterized by presenting bridge and fragment configurations both at anaphases I and II. The highest number of bridges at anaphase I found in one cell was two, suggesting heterozygosity for as many as two paracentric inversions. Typical chiasmata were almost not detectable, even though they actually existed. The chiasma-like structures observed may be regarded as concealed chiasmata as it has been described in cryptochiasmate meiosis. A high frequency of tetrads with micronuclei was observed, implying significant levels of unbalanced gametes. Pollen stainability ranged between 28 and 30%. In Alstroemeria species the meiotic behaviour is highly regular, and the presence of rearrangements is very uncommon. The whole situation led us to suggest that some environmental factors have drastically affected the chromosome structure and the control of the meiotic process. The present study constitutes the first report of remarkable meiotic irregularities found in a wild population of this genus. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_1817406X_v48_n3_p311_Sanso
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Alstroemeriaceae
Chromosomes
Cryptochiasmate meiosis
Meiotic behaviour
Pollen staining
Structural heterozygosity
Alstroemeria
Alstroemeria andina
Alstroemeriaceae
spellingShingle Alstroemeriaceae
Chromosomes
Cryptochiasmate meiosis
Meiotic behaviour
Pollen staining
Structural heterozygosity
Alstroemeria
Alstroemeria andina
Alstroemeriaceae
Sanso, A.M.
Wulff, A.F.
Meiotic irregularities in Alstroemeria andina var. venustula (Alstroemeriaceae)
topic_facet Alstroemeriaceae
Chromosomes
Cryptochiasmate meiosis
Meiotic behaviour
Pollen staining
Structural heterozygosity
Alstroemeria
Alstroemeria andina
Alstroemeriaceae
description Alstroemeria andina Phil. var. venustula (Phil.) M. Muñoz (sub nom. A. andina Phil. subsp. venustula (Phil.) Ehr. Bayer) is a perennial, small herb, 5-16 cm tall, that occurs mainly at 2,800-3,700 meters above sea level, in populations of limited distribution from Argentina and Chile. The course of the meiosis was analyzed in a population of this taxon (2n = 2x = 16), and it proved to be highly irregular. It was characterized by presenting bridge and fragment configurations both at anaphases I and II. The highest number of bridges at anaphase I found in one cell was two, suggesting heterozygosity for as many as two paracentric inversions. Typical chiasmata were almost not detectable, even though they actually existed. The chiasma-like structures observed may be regarded as concealed chiasmata as it has been described in cryptochiasmate meiosis. A high frequency of tetrads with micronuclei was observed, implying significant levels of unbalanced gametes. Pollen stainability ranged between 28 and 30%. In Alstroemeria species the meiotic behaviour is highly regular, and the presence of rearrangements is very uncommon. The whole situation led us to suggest that some environmental factors have drastically affected the chromosome structure and the control of the meiotic process. The present study constitutes the first report of remarkable meiotic irregularities found in a wild population of this genus.
format JOUR
author Sanso, A.M.
Wulff, A.F.
author_facet Sanso, A.M.
Wulff, A.F.
author_sort Sanso, A.M.
title Meiotic irregularities in Alstroemeria andina var. venustula (Alstroemeriaceae)
title_short Meiotic irregularities in Alstroemeria andina var. venustula (Alstroemeriaceae)
title_full Meiotic irregularities in Alstroemeria andina var. venustula (Alstroemeriaceae)
title_fullStr Meiotic irregularities in Alstroemeria andina var. venustula (Alstroemeriaceae)
title_full_unstemmed Meiotic irregularities in Alstroemeria andina var. venustula (Alstroemeriaceae)
title_sort meiotic irregularities in alstroemeria andina var. venustula (alstroemeriaceae)
url http://hdl.handle.net/20.500.12110/paper_1817406X_v48_n3_p311_Sanso
work_keys_str_mv AT sansoam meioticirregularitiesinalstroemeriaandinavarvenustulaalstroemeriaceae
AT wulffaf meioticirregularitiesinalstroemeriaandinavarvenustulaalstroemeriaceae
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