Are cytological parameters of maize landraces (<i>Zea mays</i> ssp. <i>mays</i>) adapted along an altitudinal cline?

The Northwestern Argentina (NWA) highland region is one of the southernmost areas of native maize cultivation. We studied variations of different cytological parameters, such as DNA contents, presence/absence of B chromosomes (Bs), and number and sequence composition of heterochromatic knobs in ten...

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Autores principales: Fourastié, María Florencia, Gottlieb, Alexandra Marina, Poggio, Lidia, González, Graciela Esther
Formato: Articulo
Lenguaje:Inglés
Publicado: 2018
Materias:
Ciencias Naturales
B chromosomes
DNA content
FISH
Knobs
Maize landraces
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/146779
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-146779
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Naturales
B chromosomes
DNA content
FISH
Knobs
Maize landraces
spellingShingle Ciencias Naturales
B chromosomes
DNA content
FISH
Knobs
Maize landraces
Fourastié, María Florencia
Gottlieb, Alexandra Marina
Poggio, Lidia
González, Graciela Esther
Are cytological parameters of maize landraces (<i>Zea mays</i> ssp. <i>mays</i>) adapted along an altitudinal cline?
topic_facet Ciencias Naturales
B chromosomes
DNA content
FISH
Knobs
Maize landraces
description The Northwestern Argentina (NWA) highland region is one of the southernmost areas of native maize cultivation. We studied variations of different cytological parameters, such as DNA contents, presence/absence of B chromosomes (Bs), and number and sequence composition of heterochromatic knobs in ten accessions of four maize landraces growing along a broad altitudinal cline in NWA. The aim of this work was to assess variations in cytological parameters and their relationship with the crop altitude of cultivation, in an adaptive context. The A-DNA content of the A chromosome complements showed 40% of difference between the lowest (4.5 pg) and the highest (6.3 pg) 2C value. This variation could be attributed to differences in number and size of heterochromatic knobs. Fluorescent in situ hybridization studies revealed the sequence composition of each knob, with a higher proportion of knobs composed of 180-bp repeats rather than TR-1 repeats, in all accessions. We also found numerical polymorphisms and the highest frequency of Bs reported in maize to this date. These results lead us to propose that the frequencies and doses of Bs are influenced by the landrace genotypical make-up. The Bs might be maintained in higher frequencies in those accessions having lower heterochromatin content, so as to preserve an optimal nucleotype. Furthermore, selective forces acting along the altitudinal gradient might be modulating the cytological parameters studied, as suggested by the significant correlations found among them.
format Articulo
Articulo
author Fourastié, María Florencia
Gottlieb, Alexandra Marina
Poggio, Lidia
González, Graciela Esther
author_facet Fourastié, María Florencia
Gottlieb, Alexandra Marina
Poggio, Lidia
González, Graciela Esther
author_sort Fourastié, María Florencia
title Are cytological parameters of maize landraces (<i>Zea mays</i> ssp. <i>mays</i>) adapted along an altitudinal cline?
title_short Are cytological parameters of maize landraces (<i>Zea mays</i> ssp. <i>mays</i>) adapted along an altitudinal cline?
title_full Are cytological parameters of maize landraces (<i>Zea mays</i> ssp. <i>mays</i>) adapted along an altitudinal cline?
title_fullStr Are cytological parameters of maize landraces (<i>Zea mays</i> ssp. <i>mays</i>) adapted along an altitudinal cline?
title_full_unstemmed Are cytological parameters of maize landraces (<i>Zea mays</i> ssp. <i>mays</i>) adapted along an altitudinal cline?
title_sort are cytological parameters of maize landraces (<i>zea mays</i> ssp. <i>mays</i>) adapted along an altitudinal cline?
publishDate 2018
url http://sedici.unlp.edu.ar/handle/10915/146779
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