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大麦黄矮病(BYD)是世界小谷粒作物为害最严重、发病最普遍的病毒病。已知北美普通小麦品种Anza及CIMMYT的几个小麦材料耐BYD。为了了解BYD耐性遗传基础.对Anza和9个其它耐性小麦材料进行了研究。将耐病材料进行杂交.并与敏感亲本Bobwhite或Bagula杂交。1990年在墨西哥Toluca附近的田间.用BYDV血清型MAV—Mex对亲本、F_1及F_2代进行了检测。1991年.在田间用相同的血清型对亲本、F_1及从每个杂交组合获得的72个F_2单株所产生的P_3品系作了分级鉴定。耐病亲本间杂交后无分离.耐病和敏感亲本杂交所得F_3品系的分布符合单基因分离比例。作者断定Anza及其它9个小麦试材的耐病性是由一普遍存在的、部分有效、部分显性Bdv 1基因所致。Bdv 1可能来源于巴西的栽培品种Frontana.由于它广泛地存在于许多ClMMYT小麦中,所以可能是一持久抗源。
Barley yellow dwarf virus (BYD) is the most serious and morbid virus disease in the world with small grain crops. Several wheat materials known to be North American common wheat varieties Anza and CIMMYT are resistant to BYD. In order to understand the genetic basis of BYD tolerance, Anza and nine other resistant wheat cultivars were studied. The disease-resistant material is crossed and crossed with the sensitive parent Bobwhite or Bagula. Fields near Toluca, Mexico, in 1990. The parents, F 1 and F 2 generations were tested with the BYDV serotype MAV-Mex. 1991. P_3 lines produced by the same serotype in the field, F_1 and 72 F2 plants obtained from each cross were identified in grading. There was no segregation after hybridization between resistant parents.The phenotypic distribution of F_3 lines from resistant and susceptible parents was in line with the proportion of single gene segregation. The authors conclude that disease resistance in Anza and nine other wheat cultivars is caused by a ubiquitous, partially potent, and partially dominant Bdv 1 gene. Bdv 1 may be derived from the Brazilian cultivar Frontana, which may be a permanent source of resistance because of its widespread presence in many ClMMYT wheat.