Juxtaposition of heterozygous and homozygous regions and crossing over in maize

Mikhailov Mihail

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2023-08-27 19:18

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633.15:631.527.5 (27)

Cereals. Grain crops (681)

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MIKHAILOV, Mihail. Juxtaposition of heterozygous and homozygous regions and crossing over in maize. In: Biotehnologii avansate – realizări şi perspective, Ed. 6, 3-4 octombrie 2022, Chişinău. Chișinău, Republica Moldova: Centrul Editorial-Poligrafic al USM, 2022, Editia a VI-a, pp. 35-37. ISBN 978-9975-159-81-4. DOI: https://doi.org/10.53040/abap6.2022.11

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Biotehnologii avansate – realizări şi perspective
Editia a VI-a, 2022

Simpozionul "Biotehnologii avansate – realizări şi perspective"
6, Chişinău, Moldova, 3-4 octombrie 2022

Juxtaposition of heterozygous and homozygous regions and crossing over in maize

DOI:https://doi.org/10.53040/abap6.2022.11

CZU: 633.15:631.527.5

Pag. 35-37

Mikhailov Mihail

Institute of Genetics, Physiology and Plant Protection

Proiecte:

Menționat în lucrare: 20.80009.5107.03 Valorificarea eficientă a resurselor genetice vegetale și biotehnologiilor avansate în scopul sporirii adaptabilității plantelor de cultură și schimbările climatice

Disponibil în IBN: 13 octombrie 2022

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It is believed that the function of crossing over is the reshuﬄing of genetic material in sexually reproducing species. However, the rarity of crossover events (usually 1-2 per chro-mosome) can cause diﬃculties for their use in breeding. Therefore, much attention is paid to the study of the factors regulating frequency and location of crossovers. One of long-studied factors is heterozygosity. A very remarkable phenomenon was discovered in the analysis of cis-eﬀects, when the relationship between polymorphism in some regions and the recombination rate in neighboring ones was studied. In Arabidopsis F2 plants, when a homozygous region is adjacent to a heterozygous one (which is called juxtaposition by the authors), the frequency of crossovers decreases in homozygous region and increases in neighboring heterozygous ones [4]. There is a redistribution of crossovers, or in authors’ terms, remodelling. One of the authors assumes for this phenomenon an adaptive sense for self-pollinators, as Arabidopsis, and wished that similar studies be carried out on other plants, including outcrosses [3]. Note that we have already observed the eﬀect of juxtaposition in the maze F2 generation (outcross), although we did not interpret it as remodelling [2]. Research on maize has continued since then, and here we present the main results.

Cuvinte-cheie
crossing over, meiosis, Maize

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<dc:date>2022</dc:date>
<dc:description xml:lang='en'><p>It is believed that the function of crossing over is the reshuﬄing of genetic material in sexually reproducing species. However, the rarity of crossover events (usually 1-2 per chro-mosome) can cause diﬃculties for their use in breeding. Therefore, much attention is paid to the study of the factors regulating frequency and location of crossovers. One of long-studied factors is heterozygosity. A very remarkable phenomenon was discovered in the analysis of cis-eﬀects, when the relationship between polymorphism in some regions and the recombination rate in neighboring ones was studied. In Arabidopsis F2 plants, when a homozygous region is adjacent to a heterozygous one (which is called juxtaposition by the authors), the frequency of crossovers decreases in homozygous region and increases in neighboring heterozygous ones [4]. There is a redistribution of crossovers, or in authors&rsquo; terms, remodelling. One of the authors assumes for this phenomenon an adaptive sense for self-pollinators, as Arabidopsis, and wished that similar studies be carried out on other plants, including outcrosses [3]. Note that we have already observed the eﬀect of juxtaposition in the maze F2 generation (outcross), although we did not interpret it as remodelling [2]. Research on maize has continued since then, and here we present the main results.</p></dc:description>
<dc:source>Biotehnologii avansate – realizări şi perspective (Editia a VI-a) 35-37</dc:source>
<dc:subject>crossing over</dc:subject>
<dc:subject>meiosis</dc:subject>
<dc:subject>Maize</dc:subject>
<dc:title>Juxtaposition of heterozygous and homozygous regions and crossing over in maize</dc:title>
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