The Genes Bm2 and Blmc that Affect Epicuticular Wax Deposition in Sorghum are Allelic
2017
Punnuri, Somashekhar | Harris‐Shultz, Karen | Knoll, J. (József) | Ni, Xinzhi | Wang, Hongliang
Epicuticular waxes (EW) coat the aerial surfaces of the sorghum [Sorghum bicolor (L.) Moench] plant and have a role in the plant's resistance to abiotic and biotic stresses, such as drought, ultraviolet light, insects, and fungal pathogens. Mutants of the Bloomless2 (Bm2) locus, such as bm2‐3, lack visible EW and have inhibited synthesis of the cuticle. The sorghum mutant bloom‐cuticle (blmc) also lacks visible EW and has inhibited synthesis of the cuticle, as well as many other effects. In this study, an allelism test was performed, which revealed that blmc is an allele of the Bm2 locus and is hereby designated as bm2‐7. This finding allows the data that have been generated separately from each of these mutations to be merged. Thus, the results suggest that the Bm2 locus is on sorghum chromosome 10 and could have pleiotropic effects, including cuticle proper synthesis, leaf water retention, greenbug biotype C (Schizaphis graminum Rondani) susceptibility, and resistance to the fungal pathogen Exserohilum turcicum Pass., which causes northern corn leaf blight. Further examination of the Bm2 locus can be accomplished by the use of only one mutant line.
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