Zad J, Aghakhani M, Etebarian R, Okhovat M
Plant Pathology Department, College of Agriculture University of Tehran, Karaj, Iran.
Meded Rijksuniv Gent Fak Landbouwkd Toegep Biol Wet. 2002;67(2):279-81.
Leaf stripe is one of the most important diseases of barley in Iran especially in Gorgan, Mazandran and near Tehran (Varamin). Most obvious symptoms of the disease are described. Long pale or yellow stripes become darker as the fungus sporulates on the leaf surface. Infected plants usually are stunted and produce sterile spikes, rarely a few seeds are produced. Infected spikes and late-forming tillers may produce fertile spikes. The fungus is seed brone and survives in the outer layers of infected seed. To study the seed-borne disease, we have used the different methods (ISTA). Coleoptiles of seedlings are infected by the fungus under cool, moist conditions, a soil temperature below 15 degrees C is necessary for seed infection. The fungus penetrates through coleoptiles and grows systemically within the plant, produces toxin and kills cells and discolors leaf tissue between veins, thus causing striped lesions. When conditions are wet or humid, spores are produced on the surface of leaves at above the time spikes of healthy plant. Morphological characteristics of the vegetative and reproductive structures of the fungus show that it is Drechslera graminea (Rabenh) Shoemaker.
条斑病是伊朗大麦最重要的病害之一，尤其是在戈尔甘、马赞德兰以及德黑兰附近（瓦拉明）。文中描述了该病最明显的症状。随着真菌在叶片表面形成孢子，长形的浅色或黄色条纹会变深。受感染的植株通常发育不良，产生不育穗，很少能结出少量种子。受感染的穗和晚形成的分蘖可能会产生可育穗。该真菌通过种子传播，在受感染种子的外层存活。为研究种子传播病害，我们采用了不同方法（国际种子检验协会方法）。在凉爽、潮湿的条件下，幼苗的胚芽会被真菌感染，种子感染需要土壤温度低于15摄氏度。真菌穿透胚芽并在植物体内系统生长，产生毒素，杀死细胞并使叶脉间的叶组织变色，从而导致条斑病斑。当条件潮湿时，在健康植株穗期之后，叶片表面会产生孢子。该真菌营养体和繁殖体的形态特征表明它是禾旋孢腔菌（拉本霍斯特）休梅克。
