Inheritance of resistance to angular leaf spot in Nicotiana tabacum L. cultivars burley 21 and kentucky 14 |
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| Authors: | Mary Jordan Wannamaker Rebeca Chacon Rufty |
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| Institution: | (1) Department of Crop Science and Department of Plant Pathology, North Carolina State University, 27695-7620 Raleigh, NC, USA;(2) Dept. of Horticultural Sciences, North Carolina State University, 27695-7609 Raleigh, NC, USA |
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| Abstract: | Summary The genetics of resistance to angular leaf spot caused by Pseudomonas syringae pv. tabaci in Nicotiana tabacum cultivars Burley 21 and Kentucky 14 was investigated by studying disease reactions to three isolates of parental, F1, F2 and backcross generations derived from crosses between the resistant cultivars and the susceptible cultivar Judy's Pride. Studies were conducted in the greenhouse and in field plant beds. Chi-square values were computed to determine whether the observed ratios for disease reactions deviated from expected Mendelian ratios for a single, dominant gene controlling resistance to angular leaf spot in tobacco. Based on the resistance of the F1 and the backcross generation to the resistant parent (BC-R), a 3 resistant: 1 susceptible segregation ratio in the F2, and a 1 resistant: 1 susceptible segregation ratio in the backcross generation to the susceptible parent (BC-S), it was concluded that resistance to three isolates of Pseudomonas syringae pv. tabaci is governed by a single, dominant gene. |
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| Keywords: | Nicotiana tabacum tobacco Pseudomonas syringae pv tabaci bacteria breeding disease resistance |
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