波斯小麦-粗山羊草双二倍体Am3抗白粉病特性的基因定位

 对合成的波斯小麦-粗山羊草双二倍体Am3进行了抗叶锈病和白粉病不同生理小种的鉴定。结果表明，在合成的六倍体小麦中，DD组的抗叶锈性受到AABB组的抑制。对Am3进行抗白粉病4号小种的遗传分析和基因定位表明，Am3具1对显性抗病基因，位于2A染色体上。DD组上的抗白粉病基因也受AABB组抑制。但其抑制程度因病害小种的不同而有差异。根据实验结果和文献认为，只要适当选择亲本，并针对一定的病害小种，利用粗山羊草改良普通小麦的抗病性是完全可能的。另外，波斯小麦PS5是值得重视的白粉病抗源。

GENE MAPPING OF RESISTANCE TO POWDERY MILDEW IN TRITICUM PERSICUM-AEGILOPS TAUSCHII AMPHIDIPLOID AM3

Amphidiploid Am3 derived from the crosses between Triticum persicum vat. darginicum Bexg. et Muizhn. and Aegilops tauschii, are evaluated for their resistance to different races of leaf rust (Puccinia recondita tritici) and powdery mildew (Erysiphe graminis tritici). The results effectively demonstrate the resistance to leaf rust on DD genomes in synthetic hexaploid wheats. Through genetic analysis and chromosome location (monosomic analysis) on resistance gene of amphidiploid Am3 to race 4 of powdery mildew, a dominant gene located on chromosome 2Awas found. And, the resistance gene to powdery mildew on DD genomes was also suppressed by AABB genomes, but the suppressing levels varied with different races Of powdery mildew. According to the experimental results and some reference materials, it is possible to improve the disease resistance level of common wheats by using Ae. tauschii, provided proper parents with AABB genomes are chosen in connection with specific pathogen races. Moreover, T. carthlict.(PS 5) is a useful resource of resistance to powdery mildew.