野生樱桃李对南方根结线虫的抗性

为探明野生樱桃李对南方根结线虫的抗性,以实生钵苗为试材,采用人工接种等方法,研究了野生樱桃李对南方根结线虫的抗性。结果表明：接种后30d,根中雌成虫数量占接种量的0.5%,依据抗性评价标准判定其高抗南方根结线虫;野生樱桃李对南方根结线虫的抗性存在显著的株间分离现象,表现为免疫、高抗、中抗和低抗4种类型,分别占群体总量的30.0%、52.5%、13.8%和3.8%;根内线虫数量为接种量的1.7%,雌成虫数量占根内线虫总数的29.4%,表明野生樱桃李对南方根结线虫具有极强的抗侵入作用和很强的抗发育作用,抗侵入是野生樱桃李对南方根结线虫的主要抗性机制。野生樱桃李是优异的抗南方根结线虫种质资源。

Resistance of Prunus divaricata Ledeb.to Meloidogyne incognita

In order to investigate the resistance of Prunus divaricata Ledeb.to Meloidogyne incognita,the resistance of Prunus divaricata Ledeb.to Meloidogyne incognita was studied with the seedlings and the method of artificial inoculation.The results showed that 0.5% inoculation perplantlet were penetreted by female adult following 30 days after artificial inoculation.Prunus divaricata Ledeb.was highly resistant to Meloidogyne incognita according to the resistance evaluation standard.Resistance was segregated in seedlings.The immuned,highly resistant,middle resistant and lowly resistant genotypes were found in Prunus divaricata Ledeb,being 30.0%,52.5%,13.8% and 3.8% of the seedlings respectively.The penetrated nematode population was 1.7% of the inoculated quantity,in which the female adult population is 29.4%.Prunus divaricata Ledeb.was one of resistant species and germplasm resource for Meloidogyne incognita because it resisted with the penetration and delayed the development of juvenile nematodes.The penetration inhibition is the major resistance mechanism.