抗南方根结线虫普通烟草种质资源筛选与主栽品种抗性退化评价

Selection of Disease Resistant to Meloidogyne incognita from Cultivated Nicotian tabacum and Evaluation on Resistance Degradation of Main Varieties

为正确评价云南烟区主栽烤烟品种的抗性退化及筛选出抗南方根结线虫的普通烟草种质资源,采用大田试验,以NC95为抗病对照,以及"贵定尖叶折烟"为感病对照,研究混合根结线虫综合抗性高抗的15个品种(系)和3个具有垂直抗性的主栽品种的抗性状况.结果表明,混合根结线虫综合抗性高抗的品种(系)中有6个对南方根结线虫具有一定的抗病性,由强到弱依次为G278-15和SA1215> NCTG70>德江小黑烟> SPG108、梧桐叶1012;3个烤烟主栽品种中,对南方根结线虫的抗性表现为K326优于云烟87,红花大金元抗性丧失.此外,研究结果可为当地优质烟叶生产合理防控根结线虫提供科学依据,也可为南方根结线虫的抗性育种提供目标抗性资源.

In order to evaluate the resistance degradation of main variety tobacco in Yunnan and to select tobacco varieties with the disease resistance to M. incongnita,the field experiment was conducted with NC95 as the disease-resistant control,and "Guiding Jianyezhe"as the symptomatic control to study 15 varieties for the resistance to mixed incongnita with comprehensive high resistance and3 main varieties with vertical resistance. The results showed that among the varieties in the mixed incongnita with comprehensive high resistance,6 cultivars had disease resistance to M. incognita. The disease incidence from high to low ranged from G278-15,SA1215,NCTG70,Dejiang Black Smoke,SPG108,and Wutongye 1012;Among the three major widely commercial released varieties of fluecured tobacco,the cultivar of K326 had higher resistance to M. incognita than that of Yunyan87,while the cultivar "Honghuadajinyuan"was susceptible to M. incognita. Therefore,this study provided a scientific basis for the prevention and control of root-knot nematodes in high-quality leaf production,and target resistance resources for tobacco breeding of disease resistant to M. incognita.