黑麦草品种对灰梨孢灰斑病的室内抗性评价

Resistance evaluation of ten ryegrass varietiesto Pyricularia grisea

摘要:

为研究不同品种黑麦草对灰梨孢灰斑病菌(Pyricularia grisea)的抵抗能力,用涂抹法将该病菌接种于四川主要栽培的10个黑麦草品种,依据病情指数评价抗病性。结果表明:一年生黑麦草(Lolium multiflorum)(6个品种)的发病率、平均严重度均显著高于多年生黑麦草(Lolium multiflorum)(4个品种)。10个黑麦草品种中,绅士、首相、纽怡、维多利亚4个多年生黑麦草品种均表现为高抗(HR),4个品种间无显著差异(P＜0.05);一年生黑麦草品种均不同程度的表现为感病(HS,MS),其中川农1号、安格斯1号、安第斯、普通4个品种表现为高感(HS),杰威表现为中感(MS),长江2号表现为中抗(MR)。

Abstract:

This study investigated the resistance of different varieties of ryegrass to Pyricularia grisea.The pathogen was inoculated with smudge method to 10 main cultivated ryegrass varieties(Lolium multiflorum,Lolium perenne)in Sichuan,and disease resistance was evaluated according to disease index.The results showed that the incidence and mean severity in annual ryegrass(six varieties)were significantly higher than those in perennial ryegrass(four varieties).The disease index was used to classify the resistance of 10 ryegrass varieties.All four perennial ryegrass of Gentleman,Prime minister,Nuyi,and Victoria showed high resistance(HR),with no significant difference between those four varieties(P＜0.05).The annual ryegrass all showed different degree of susceptibility(HS,MS),among which four varieties(Chuannong 1,Angus 1,Andes and Ordinary)showed high susceptibility(HS),Jiewei showed moderate susceptibility(MS),while Changjiang 2 showed medium resistance(MR).The disease occurred and spreaded quickly,and caused severe damage.It is recommended that disease-resistant varieties would be preferentially selected for prevention and control,in addition to early prevention and control.