Abstract
A genetic analysis of heat shock protein (HSP) synthesis was performed in seedling leaf tissue of two maize inbred lines, their F1 hybrid and F2 progeny. Protein synthesis following a high temperature treatment was visualized by [35S]-methionine in vivo labelling and two-dimensional gel electrophoresis. The parental lines' HSP synthesis patterns revealed both qualitative and quantitative polymorphisms implicative of differences in HSP structural genes and regulatory factors. The F1 hybrid HSP profile indicated that synthesis of all parental HSPs conformed to dominant inheritance patterns, including complete dominance, over-dominance and co-dominance. Alleles for six low-molecularweight HSPs in F2 progeny assorted according to typical 3∶1 Mendelian ratios for dominant gene expression. There is evidence for unlinked gene loci of four different HSP gene pairs, but data for three other HSP gene pairs were inconclusive, perhaps reflecting linkage for one pair and complex regulatory factor interactions for the other two pairs of genes. These results clearly indicate the existence of genetic variability in HSP synthesis and emphasize the potential of partitioning their roles in thermal tolerance using genetic and molecular analyses.
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Communicated by H. F. Linskens
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Jorgensen, J.A., Nguyen, H.T. Genetic analysis of heat shock proteins in maize. Theoret. Appl. Genetics 91, 38–46 (1995). https://doi.org/10.1007/BF00220856
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DOI: https://doi.org/10.1007/BF00220856