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The ethylene biosynthesis-inducing xylanase (EIX) is known to be a potent elicitor of ethylene biosynthesis and other responses when applied to leaf tissue of Nicotiana tabacum L. cv Xanthi. In contrast, leaf tissue of the tobacco cultivar Hicks was insensitive to EIX at concentrations 100-fold higher than was needed to elicit responses from Xanthi. Cell-suspension cultures of Xanthi and Hicks showed similar differences in sensitivity to EIX. Equivalent levels of ethylene production were elicited in leaf discs of both cultivars after treatment with CuSO4. The F1 and Xanthi backcross progeny of Hicks and Xanthi crosses were all sensitive to EIX, whereas the F2 and Hicks backcross progeny segregated for sensitivity to EIX. Individual plants from the F2 and Hicks backcross that were insensitive to EIX produced only insensitive progeny when they were self-pollinated. Progeny from sensitive plants either segregated for sensitivity to EIX or produced all sensitive progeny (an F2 plant). Sensitivity to EIX is controlled by a single dominant gene, based on chi-square analysis of segregation ratios.

Sensitivity to an Ethylene Biosynthesis-Inducing Endoxylanase in Nicotiana tabacum L. cv Xanthi Is Controlled by a Single Dominant Gene