【摘要】 利用12个日本鉴别品种、7个中国鉴别品种、24个抗稻瘟病单基因系及6个当地主栽品种,对2006年采自该省主要积温区不同水稻品种的178个稻瘟病菌株进行了致病性测定。结果表明:2006年黑龙江省稻瘟病菌生理小种划分为104个日本小种,077.7号生理小种比例最高为4.49%,017.1号、017.5号、037.5号生理小种出现频率为3.93%。就抗性基因而言,抗瘟基因Pi9(t)在全省抗谱为97.75%,是较好的抗源可以在全省内广泛利用;Piz-5、Pi12(t)抗瘟基因抗谱分别为78.09%和78.65%,根据品种种植区域可以有选择地利用。就品种而言,抗瘟基因Pi9(t)、Piz-5是空育131;Pi5(t)、Pita-2是垦稻10号;Pi9(t)、Pita是上育397;Piz-5、Pi12(t)是垦稻12号等品种抗瘟改良的有利基因;在研究中同时加强对稻瘟病菌种群的监测和新抗源的发掘,有针对性地向主栽品种导入新的抗性基因。更多还原

【Abstract】 A total of 178 Magnaporthe oryzae(M.oryzae) isolates,collected from different rice-cropping districts of Heilongjiang Province in 2006,were tested for pathogenicity against 12 Japanese and 7 Chinese differential varieties(DVs),24 rice monogenic lines(MLs) with different blast resistance genes and 6 local leading cultivars.The results showed that 104 Japanese races(pathotypes) were identified and the predominant ones were 077.7,017.1,017.5 and 037.5.Resistance gene Pi9(t) expressed the broadest resistance spectrum(on average 97.75%) to all the blast isolates tested,and was of the highest utilization value in rice resistance breeding.Resistant genes Piz-5 and Pi12(t) also showed high utilization values due to their resis-tance spectra were 78.09% and 78.65%.The results showed that some resistance gene could upgrade the blast resistance of rice varieties,for example,Pi9(t) and Piz-5 upgrade the blast resistance of Kong Yu 131;Pi5(t) and Pita-2 upgrade the blast resistance of Ken Dao 10;Pi9(t) and Pita upgrade the blast resistance of Shang Yu 397;Piz-5 and Pi12(t) upgrade the blast resistance of Ken Dao 12.Simultaneously,the new resis-tance resources will be explored extensively and the new broad-spectrum resistance genes will be transfered into leading cultivars purposefully.更多还原