Identification of resistant barley genetic resources to Bipolaris sorokiniana and ana-lyses on main resistance types
Barley spot blotch,caused by the facultative B.sorokiniana,is an important foliar disease on bar-ley,being widely prevalent in most barley-growing regions in the world.It is most destructive especially in the regions with warm and moist climates,consequently bringing about serious yield losses.Presently,spot blotch is the first important fungal epidemic disease in the spring barley-growing regions in northeastern China.The disease usually occurs in mid-and late-growth stages of barley.Growing resistant varietiesis,therefore,the most cost-effective measure for the disease control.In this study,two highly virulent dominant B.sorokiniana isolates Z12028 and Z15525 derived from northeastern China were selected to identify spot blotch resistance in barley germplasm accessions at the seedling and adult plant stages.Only one accession 2013F61903 was found to be highly resistant to Z12028 at the seedling stage,and no immune one accession to B.sorokiniana was detected.Nine accessions,such as ZDM00009,ZDM00013,ZDM00094,ZDM08888,ZDM01414,ND14049,ND B112,Newdale,and kenpimai 9 among the tested germplasm accessions,were found to be of allstage resistance to the both highly virulent isolates;fourteen accessions(4.3% )like ZDM00074,Bowman and Stander were resistant only at the seedling stage but susceptible at the adult plant stage,and another 72 accessions(28.3% )of adult plant resistance to spot blotch.Barley accessions of adult plant resistance accounted for 28.1% and 29.5% to Z12028 and Z15525,respectively.As a result,the percentage of adult plant resistant accessions to spot blotch was significantly higher than that of those with all stage resistance.The results of this study provided valuable resistant resources for exploiting new spot blotch resistance genes.
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