شناسایی صفات مرتبط با مقاومت به PVY در دابل‌هاپلوئیدهای توتون

New disease resistant cultivars product has always been with problems such as reducing the quantity and quality. Therefore, this study aimed to determine the agronomic and chemical traits correlated with resistance to PVY in tobacco took place. Doubled haploid lines derived from crosses of cv K326 (Business, susceptible to PVY) and VAM (resistant to PVY) were produced. Seven selected Doubled haploid lines and K326 planted in the field and in the early stages of growth were inoculated with purified PVY extract. Agronomic And chemical traits were measured and symptoms were rated. Correlation and regression analysis was performed between traits and resistance. The correlation between the symptoms and amount of chlorophyll (-0.90), and between the symptoms of sugar to nicotine ratio (0.91) were highly significant. The result showed a reduction in symptoms with increased chlorophyll content and also symptoms was more severe with increasing the sugar to nicotine ratio. Since the ratio of sugar to nicotine affect tobacco leaf quality, so production of high resistant lines along quality seems to be difficult.