A dominant, host plant mutation conferring ineffective nodulation in the chickpea-Rhizobium symbiosis

Article Abstract:

Radiation-induced chickpea mutants PM233B, PM665B, PM679B, PM405B and PM796B are particularly useful for research into the host contribution to the nodulation process in the legume-Rhizobium symbiosis because they are all basically isogenic. They differ from ICC 640, a common wild-type parent, only in terms of mutations in single nodulation genes. A transmission genetic study of mutant PM638 has established that a single dominant nuclear gene mutation carried by original mutant PM638 accounts for the ineffective nodulation phenotype in crosses between mutant line PM638A and ICC 640. Ongoing work shows that the PM638 mutant has close links with the rn1 gene and is not linked with other known chickpea nodulation genes.

Plant genetics, Chickpea, Chick peas

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Shikimate dehydrogenase allozymes: inheritance and close linkage to fruit color in the diploid strawberry

Article Abstract:

Experimental studies on the nature of linkage of shikimate dehydrogenase (SDH) isozymes in diploid strawberries with loci determining fruit color and phosphoglucoisomerase indicate a positive linkage between the loci determining fruit color and polymorphism of the SDH isozymes. This relationship has a recombination frequency of 1.1%. The SDH isozymes can serve as markers for fruit color selection if this genetic correlation is present in the octoploid level also.

Observations, Developmental genetics, Isoenzymes, Color of fruit, Fruit color

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A linkage map of the diploid strawberry, Fragaria vesca

Article Abstract:

The first linkage map of the diploid strawberry, Fragaria vesca, was reported. The map contains 80 markers, 64 of these are dominant and 11 are codominant randomly amplified polymorphic DNA (RAPD) markers for seven linkage groups of the diploid. Template mixing methods for primer testing and marker analysis were used to improve the detection and interpretation of codominant RAPD markers.

Linkage (Genetics), Diploidy

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