Inheritance and linkage relationships of glutamate oxaloacetate transaminase isoenzymes in apple |
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Authors: | A G Manganaris F H Alston |
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Institution: | (1) Institute of Horticultural Research, East Mailing, ME19 6BJ Maidstone, Kent, UK;(2) Present address: Pomology Institute, 59200 Naoussa, Greece |
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Abstract: | Summary Four zones of enzymatic activity for glutamate oxaloacetate transaminase (GOT) were found in apple tissue. A dimeric gene, GOT-1, determining the fastest migrating zone, was identified. Six alleles were found, including a near null allelle which produced detectable heterodimeric bands but not homodimeric bands. A marked deficit or absence of certain geno-types in all backcrosses and in some crosses between unrelated varieties was attributed to the close linkage (r=0.02±0.005) of GOT-1 with the incompatibility S locus. GOT-1 was also closely linked with the isocitrate dehydrogenase locus IDH-1 (0.03±0.01). Proposed incompatibility genotypes for four cultivars, and the linked GOT-1 alleles are Cox: S
1
b/S
2
d, Idared: S
3
a/S
4
c, Fiesta: S
3
a/S
2
d and Kent: S
3
a/S
1
b.The results reported in this paper are part of a PhD Thesis by the first author |
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Keywords: | Malus pumila Mill Glutamate oxalo-acetate transaminase Incompatibility Genes GOT-1 IDH-1 S Linkage |
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