Scholarlink

Background <p><i>Meloidogyne incognita</i> is a major soil-borne pathogen in tobacco production, which severely restricts the sustainable development of the Chinese tobacco industry. At present, problems including the diminished disease resistance of mainstream tobacco cultivars and the scarcity of resistant germplasm resources have become increasingly pronounced, and thus the breeding of new tobacco varieties with high resistance to <i>M. incognita</i> has become an urgent priority. Previous studies have revealed that the tobacco germplasm SA1214 originating from South Africa displays extremely high resistance to root-knot nematodes in field trials, yet its specific resistance grade and the systematic physiological and biochemical mechanisms underlying this resistance remain unclear.</p> Results <p>The results showed that SA1214 displayed strong resistance to <i>M. incognita</i>, with all its disease indices being significantly lower than those of susceptible cultivars such as Yunyan 87. This cultivar effectively inhibited the invasion by <i>M. incognita</i> and significantly delayed the late developmental process of the nematode post-infection. The giant cells at the infection sites exhibited characteristics of early vacuolization and disintegration, accompanied by the induction of plant defense responses including a prominent reactive oxygen species (ROS) burst and programmed cell death (PCD).</p> Conclusion <p>In summary, SA1214 is a tobacco cultivar with favorable application prospects for resistance to <i>M. incognita</i>. This study provides technical support for in-depth investigations into the molecular mechanisms of tobacco nematode resistance and the breeding of disease-resistant tobacco cultivars, and also contributes to the green and sustainable development of the tobacco industry.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Resistance analysis of the Tobacco Variety SA1214 against M. incognita based on physiological and biochemical assays

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年7月9日

查看全文
  • Songmei Chen,
  • Shaofang Zhou,
  • Yuezhang Guan,
  • Hao Yue,
  • Yang Wang,
  • Xuejun Chen,
  • Wentao Wu

摘要

Background

Meloidogyne incognita is a major soil-borne pathogen in tobacco production, which severely restricts the sustainable development of the Chinese tobacco industry. At present, problems including the diminished disease resistance of mainstream tobacco cultivars and the scarcity of resistant germplasm resources have become increasingly pronounced, and thus the breeding of new tobacco varieties with high resistance to M. incognita has become an urgent priority. Previous studies have revealed that the tobacco germplasm SA1214 originating from South Africa displays extremely high resistance to root-knot nematodes in field trials, yet its specific resistance grade and the systematic physiological and biochemical mechanisms underlying this resistance remain unclear.

Results

The results showed that SA1214 displayed strong resistance to M. incognita, with all its disease indices being significantly lower than those of susceptible cultivars such as Yunyan 87. This cultivar effectively inhibited the invasion by M. incognita and significantly delayed the late developmental process of the nematode post-infection. The giant cells at the infection sites exhibited characteristics of early vacuolization and disintegration, accompanied by the induction of plant defense responses including a prominent reactive oxygen species (ROS) burst and programmed cell death (PCD).

Conclusion

In summary, SA1214 is a tobacco cultivar with favorable application prospects for resistance to M. incognita. This study provides technical support for in-depth investigations into the molecular mechanisms of tobacco nematode resistance and the breeding of disease-resistant tobacco cultivars, and also contributes to the green and sustainable development of the tobacco industry.