Registration of H192 and H782, White Winter Wheat Lines Resistant to Cereal Cyst Nematode and Powdery Mildew

Wheat (Triticum aestivum L.) production in China is vulnerable to cereal cyst nematode (CCN, Heterodera avenae) and powdery mildew (caused by Blumeria graminis f. sp. tritici). Pyramiding resistance to CCN and powdery mildew was performed by crossing and topcrossing the CCN-resistant, powdery mildew-susceptible cultivar Madsen from the United States with the CCN-susceptible, powdery mildew-resistant cultivars Liangxing 99 and Jimai 22 from China. Two sister lines, H192 (Reg. No. GP-1001, PI 678374) and H782 (Reg. No. GP-1002, PI 678375), were selected from F 6 progenies. These lines resemble their parents Liangxing 99 and Jimai 22 for heading dates and other important agronomic traits. Results of a 2-yr field test and the inoculation test indicate that they are moderately resistant to the H. avenae pathotype Ha43, similar to their parent Madsen. Among 25 B. graminis f. sp. tritici isolates examined, H192 and H782 are resistant to 19 and 17 isolates, respectively, better than the parental cultivar Madsen, which has resistance to none of these isolates. Due to their adaptation to local production conditions and resistance to both CCN and powdery mildew, lines H192 and H782 can serve as sources of resistance in developing disease resistant wheat cultivars.