%A HAN Yu-Zhou, ZHANG Yong, YANG Yang, GU Zheng-Zhong, WU Ke, XIE Quan, KONG Zhong-Xin, JIA Hai-Yan, MA Zheng-Qiang %T Effect evaluation of QTL Qph.nau-5B controlling plant height in wheat %0 Journal Article %D 2021 %J Acta Agronomica Sinica %R 10.3724/SP.J.1006.2021.01053 %P 1188-1196 %V 47 %N 6 %U {https://zwxb.chinacrops.org/CN/abstract/article_7124.shtml} %8 2021-06-12 %X

Plant height affects directly the yield potential of wheat, and constitutes an important component of plant resistance to lodging. Although a large number of QTLs for plant height were detected, most of them have not been evaluated for their genetic effects yet. In the previous study, a major QTL Qph.nau-5B controlling wheat plant height was identified through association mapping in wheat variety collection. To evaluate the dwarfing effect of this QTL, three near-isogenic lines (NILs) with different alleles of Qph.nau-5B were developed using marker-assisted selection with Nanda 2419, Jichun 1016, and Zhengmai 9023 as donor and Zhongyou 9507 as receptor. The recipient genome compositions of these NILs were higher than 93%. Seven independent field trials were conducted and revealed that, compared with the recurrent parent, all NILs indicated a significant decrease in plant height (11.1 cm or 10.3% on average). Three alleles of Qph.nau-5B showed different degrees of dwarfing effects. The alleles coming from Jichun 1016 and Zhengmai 9023 displayed a similar effect on plant height (12.4 cm) in all environments, stronger than that of Nanda 2419 (8.6 cm). However, the relative dwarfism effects of different alleles were affected by different environments. Further analysis elucidated that this QTL had little detrimental influence on other agronomical traits such as spike number per plant, spike length and 1000-grain weight. These results suggested the breeding value of Qph.nau-5B that would be utilized for molecular design breeding of plant architecture in wheat.