A new recessive mutant - rind absence

--B. H. Choe, K. K. Kang, W. K. Lee and H. B. Lee

During our field observation we have found one phenotype shown as in Fig.3. The mutant plants show a portion of internodes lacking rind longitudinally. The lines where the mutant was found were all inbred lines developed from Korean local lines for earliness. We believe that the lines have no relationship to teosinte. The expressivity was 100%, but the penetrance varied with internodes of the stem. We found that the upper internodes showed a greater portion of rind lacking. Because of lack of rind, the plants tend to break easily at the upper internodes. Sometimes the rind was found to be lacking in the rachis. We couldn't compare our materials with the materials reported by Dr. Walton C. Galinat (MNL 49:100-102). Our materials were different in a few respects from the materials described by Dr. Galinat. The first difference was that the gene involved in our materials was recessive rather than dominant (Ri1). The second difference was that the phenotype is so clear that it can be easily observed without any treatment as is required for Ri1 material. The third difference was that the mutant phenotype was observed only in the rind of upper internodes, not in the cob as in Ri1 materials. We need further information on the materials.

Fig. 3. Plant showing rind absence. White portion along the green (dark) internodes is the naked parts of pith without rind.
 


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