Abstract
F langas , A. L., and J. G. D ickson . (U. Wisconsin, Madison.) The genetic control of pathogenicity, serotypes and variability in Puccinia sorghi. Amer. Jour. Bot. 48(4): 275–285. Illus. 1961.—Four urediospore clones of P. sorghi were inbred through the alternate host, Oxalis , and the recombinant lines were compared with the mother clones for changes in pathogenicity and serological reaction. The aecial, inbred recombinant lines were scored for pathogenicity on 6 inbred lines of maize, 4 of which contained single, dominant alleles isolated from a single gene locus each conditioning differential rust reaction and Pop 35 and Pop 36, each with 2 recessive genes. The inbred, recombinant lines from each of the 4 mother clones reflected similar dimensional changes from original pathogenicity, that is, an ultimate gain or loss in host range or specificity. Based on reaction type incited on the 4 allelic differential hosts, continued inbreeding through 3 generations did not segregate homozygous pathogenic complements into distinct pathogenic biotypes. A similar array of pathogenic types was produced after each generation of inbreeding. The suppressed pathogenicity types in the dicaryotic line were revealed only through recombination. Hybridization between dicaryotic lines of selected pathogenic types of sibling and nonsibling pedigree confirmed the indeterminate nature of the pathogenic locus. The genetic basis of the commonly occurring mesothetic‐X reaction (necrotic flecks and uredia of varying size surrounded by chlorotic and necrotic areas) is explained by the heterologous complementarity of fit of the interacting genic systems (genetic units). The heterologous mesothetic‐X reactions offer ambiguous definition to the specificity state of the interaction and cannot be explained on the discrete gene‐for‐gene basis of rust reaction. Antisera produced from the pathogenic types differentiated the homologous from the heterologous combinations and revealed cross‐reactions with P. graminis avenae. The comparative antigen constitution of the urediospore clones and the sibling recombinants thus far reveal a possible parallel existing between the modes of inheritance of pathogenic specificity and antigenic specificity.
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Claims 9
Claim · model-written summary
Inbred recombinant lines of P. sorghi showed similar changes from original pathogenicity, an ultimate gain or loss in host range or specificity.
- Interactor
- P. sorghi
Puccinia sorghie1pathogen - Outcome
- changes from original pathogenicitye2
- Qualifier
- an ultimate gain or loss in host range or specificitye2
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“scored for pathogenicity on 6 inbred lines of maize”
e1“Four urediospore clones of P. sorghi were inbred”
e2“reflected similar dimensional changes from original pathogenicity, that is, an ultimate gain or loss in host range or specificity”
Claim · model-written summary
Continued inbreeding did not segregate homozygous pathogenic complements into distinct pathogenic biotypes.
- Interactor
- P. sorghiPuccinia sorghie1pathogen
- Outcome
- segregate homozygous pathogenic complements into distinct pathogenic biotypese3
- Qualifier
- continued inbreeding through 3 generationse3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“scored for pathogenicity on 6 inbred lines of maize”
e1“Four urediospore clones of P. sorghi were inbred”
e3“continued inbreeding through 3 generations did not segregate homozygous pathogenic complements into distinct pathogenic biotypes”
Claim · model-written summary
A similar array of pathogenic types was produced after each generation of inbreeding.
- Interactor
- P. sorghiPuccinia sorghie1pathogen
- Outcome
- array of pathogenic typese4
- Qualifier
- after each generation of inbreedinge4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“scored for pathogenicity on 6 inbred lines of maize”
e1“Four urediospore clones of P. sorghi were inbred”
e4“A similar array of pathogenic types was produced after each generation of inbreeding”
Claim · model-written summary
Suppressed pathogenicity types in the dicaryotic line were revealed only through recombination.
- Interactor
- P. sorghiPuccinia sorghie1pathogen
- Outcome
- suppressed pathogenicity typese5
- Qualifier
- only through recombinatione5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“scored for pathogenicity on 6 inbred lines of maize”
e1“Four urediospore clones of P. sorghi were inbred”
e5“The suppressed pathogenicity types in the dicaryotic line were revealed only through recombination”
Claim · model-written summary
Hybridization confirmed the indeterminate nature of the pathogenic locus in P. sorghi.
- Interactor
- P. sorghiPuccinia sorghie1pathogen
- Gene
- pathogenic locuse6
- Outcome
- indeterminate nature of the pathogenic locuse6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“scored for pathogenicity on 6 inbred lines of maize”
e1“Four urediospore clones of P. sorghi were inbred”
e6“Hybridization between dicaryotic lines of selected pathogenic types of sibling and nonsibling pedigree confirmed the indeterminate nature of the pathogenic locus”
Claim · model-written summary
The mesothetic-X reaction is explained by heterologous complementarity of fit of the interacting genic systems.
- Outcome
- commonly occurring mesothetic‐X reactione7
- Qualifier
- heterologous complementarity of fit of the interacting genic systemse7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“scored for pathogenicity on 6 inbred lines of maize”
e1“Four urediospore clones of P. sorghi were inbred”
e7“The genetic basis of the commonly occurring mesothetic‐X reaction (necrotic flecks and uredia of varying size surrounded by chlorotic and necrotic areas) is explained by the heterologous complementarity of fit of the interacting genic systems”
Claim · model-written summary
Heterologous mesothetic-X reactions cannot be explained on the discrete gene-for-gene basis of rust reaction.
- Outcome
- heterologous mesothetic‐X reactionse2
- Qualifier
- cannot be explained on the discrete gene‐for‐gene basis of rust reactione2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“scored for pathogenicity on 6 inbred lines of maize”
e1“Four urediospore clones of P. sorghi were inbred”
e2“The heterologous mesothetic‐X reactions offer ambiguous definition to the specificity state of the interaction and cannot be explained on the discrete gene‐for‐gene basis of rust reaction”
Claim · model-written summary
Antisera from the pathogenic types revealed cross-reactions with P. graminis avenae.
- Interactor
- P. graminis avenae
Puccinia graminise2pathogen - Outcome
- cross‐reactionse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“scored for pathogenicity on 6 inbred lines of maize”
e1“Four urediospore clones of P. sorghi were inbred”
e2“Antisera produced from the pathogenic types differentiated the homologous from the heterologous combinations and revealed cross‐reactions with P. graminis avenae”
Claim · model-written summary
A possible parallel exists between the modes of inheritance of pathogenic specificity and antigenic specificity in P. sorghi.
- Interactor
- P. sorghiPuccinia sorghie1pathogen
- Outcome
- a possible parallel existing between the modes of inheritance of pathogenic specificity and antigenic specificitye2
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“scored for pathogenicity on 6 inbred lines of maize”
e1“Four urediospore clones of P. sorghi were inbred”
e2“reveal a possible parallel existing between the modes of inheritance of pathogenic specificity and antigenic specificity”