Transfer of anthracnose resistance and pod coiling traits from Medicago arborea to M. sativa by sexual reproduction

Five asymmetric hybrid plants were obtained between Medicago sativa (2n = 4x = 32) and Medicago arborea (2n = 4x = 32) through sexual reproduction and the use of a cytoplasmically male sterile M. sativa genotype. Over 2,000 pollinations were made to obtain these hybrids. Amplified fragment length po...

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Veröffentlicht in:Theoretical and applied genetics 2008-07, Vol.117 (2), p.149-156
Hauptverfasser: Armour, D. J, Mackie, J. M, Musial, J. M, Irwin, J. A. G
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Musial, J. M
Irwin, J. A. G
description Five asymmetric hybrid plants were obtained between Medicago sativa (2n = 4x = 32) and Medicago arborea (2n = 4x = 32) through sexual reproduction and the use of a cytoplasmically male sterile M. sativa genotype. Over 2,000 pollinations were made to obtain these hybrids. Amplified fragment length polymorphism (AFLP) analysis showed that in the most studied hybrid (WA2273), 4% of the bands unique to the M. arborea parent were present, versus 72% for the unique M. sativa bands. This suggests that only a single M. arborea chromosome or chromosome parts has been transferred. WA2273 had 7% of AFLP bands which were not present in either parent, which is suggestive of chromosome rearrangements as would be expected if only chromosome parts or a single part had been transferred from M. arborea. Phenotypic evidence for hybridity was obtained for pod coiling (1.4 coils in WA2273 versus three coils in the M. sativa parent and its self and testcross populations, and one coil in M. arborea), and Colletotrichum trifolii race 2 resistance (transferred from the resistant M. arborea parent, as the M. sativa parent and the self populations were highly susceptible). The hybrids were self sterile, but were female fertile to a high level when crossed with 4x, but not 2x, M. sativa, indicating they were at or near 4x. Both the pod coiling trait and anthracnose resistance segregated in the progeny of testcrosses between WA2273 and M. sativa. The work demonstrates that agronomically useful traits can be introgressed into M. sativa from M. arborea by use of male sterile M. sativa and sexual reproduction.
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J ; Mackie, J. M ; Musial, J. M ; Irwin, J. A. G</creator><creatorcontrib>Armour, D. J ; Mackie, J. M ; Musial, J. M ; Irwin, J. A. G</creatorcontrib><description>Five asymmetric hybrid plants were obtained between Medicago sativa (2n = 4x = 32) and Medicago arborea (2n = 4x = 32) through sexual reproduction and the use of a cytoplasmically male sterile M. sativa genotype. Over 2,000 pollinations were made to obtain these hybrids. Amplified fragment length polymorphism (AFLP) analysis showed that in the most studied hybrid (WA2273), 4% of the bands unique to the M. arborea parent were present, versus 72% for the unique M. sativa bands. This suggests that only a single M. arborea chromosome or chromosome parts has been transferred. WA2273 had 7% of AFLP bands which were not present in either parent, which is suggestive of chromosome rearrangements as would be expected if only chromosome parts or a single part had been transferred from M. arborea. Phenotypic evidence for hybridity was obtained for pod coiling (1.4 coils in WA2273 versus three coils in the M. sativa parent and its self and testcross populations, and one coil in M. arborea), and Colletotrichum trifolii race 2 resistance (transferred from the resistant M. arborea parent, as the M. sativa parent and the self populations were highly susceptible). The hybrids were self sterile, but were female fertile to a high level when crossed with 4x, but not 2x, M. sativa, indicating they were at or near 4x. Both the pod coiling trait and anthracnose resistance segregated in the progeny of testcrosses between WA2273 and M. sativa. 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J</creatorcontrib><creatorcontrib>Mackie, J. M</creatorcontrib><creatorcontrib>Musial, J. M</creatorcontrib><creatorcontrib>Irwin, J. A. G</creatorcontrib><title>Transfer of anthracnose resistance and pod coiling traits from Medicago arborea to M. sativa by sexual reproduction</title><title>Theoretical and applied genetics</title><addtitle>Theor Appl Genet</addtitle><addtitle>Theor Appl Genet</addtitle><description>Five asymmetric hybrid plants were obtained between Medicago sativa (2n = 4x = 32) and Medicago arborea (2n = 4x = 32) through sexual reproduction and the use of a cytoplasmically male sterile M. sativa genotype. Over 2,000 pollinations were made to obtain these hybrids. Amplified fragment length polymorphism (AFLP) analysis showed that in the most studied hybrid (WA2273), 4% of the bands unique to the M. arborea parent were present, versus 72% for the unique M. sativa bands. This suggests that only a single M. arborea chromosome or chromosome parts has been transferred. WA2273 had 7% of AFLP bands which were not present in either parent, which is suggestive of chromosome rearrangements as would be expected if only chromosome parts or a single part had been transferred from M. arborea. Phenotypic evidence for hybridity was obtained for pod coiling (1.4 coils in WA2273 versus three coils in the M. sativa parent and its self and testcross populations, and one coil in M. arborea), and Colletotrichum trifolii race 2 resistance (transferred from the resistant M. arborea parent, as the M. sativa parent and the self populations were highly susceptible). The hybrids were self sterile, but were female fertile to a high level when crossed with 4x, but not 2x, M. sativa, indicating they were at or near 4x. Both the pod coiling trait and anthracnose resistance segregated in the progeny of testcrosses between WA2273 and M. sativa. 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subjects Agriculture
Amplified Fragment Length Polymorphism Analysis
Biochemistry
Biological and medical sciences
Biomedical and Life Sciences
Biotechnology
Chromosomes
Classical genetics, quantitative genetics, hybrids
Colletotrichum - physiology
Crosses, Genetic
Fundamental and applied biological sciences. Psychology
Genetics of eukaryotes. Biological and molecular evolution
Genomes
Hybridization, Genetic
Immunity, Innate
Life Sciences
Medicago - genetics
Medicago - microbiology
Medicago sativa - genetics
Medicago sativa - microbiology
Morphology
Original Paper
Phenotype
Plant Biochemistry
Plant Breeding/Biotechnology
Plant Diseases - genetics
Plant Diseases - immunology
Plant Diseases - microbiology
Plant Genetics and Genomics
Polymorphism
Pteridophyta, spermatophyta
Reproduction
Salinity
Seedlings - microbiology
Seeds
Vegetals
title Transfer of anthracnose resistance and pod coiling traits from Medicago arborea to M. sativa by sexual reproduction
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