Delays in heading and improvements in both spikelet number and spike length are associated with the Aegilops tausschii photoperiod-sensitive ppd-D1b allele

Ning, Shunzong and Zhao, Laibin and Li, Shijie and Li, Shengke and Zang, Tianqing and Liu, Yu’e and Yang, Hongkun and Chen, Xuejiao and Chen, Xue and Yi, Yingjin and Hao, Ming and Zhang, Lianquan and Ma, Li and Liu, Yaxi and Huang, Lin and Yuan, Zhongwei and Liu, Dengcai (2023) Delays in heading and improvements in both spikelet number and spike length are associated with the Aegilops tausschii photoperiod-sensitive ppd-D1b allele. CEREAL RESEARCH COMMUNICATIONS, 51 (3). pp. 593-601. ISSN 0133-3720 (print), 1788-9170 (online)

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Abstract

The spikelet number per spike (SNS) and spike length (SL) are key traits of interest for improving grain yields. Photoperiod-1 (Ppd-1) is a key regulator of inflorescence architecture and paired spikelet development in wheat. In this study, 170 recombinant inbred lines (RILs) derived by crossing synthetic hexaploid wheat (SHW-L1) with a commercial cultivar (Chuanmai 32) were evaluated for the number of days to heading (DTH), SNS and SL in four different years. Eight PPD1 combination homoeologs were also identified in the RILs by using genetic marker analysis. DTH had highly significant or significant positive correlations with SNS and SL, while SL also had a highly significant positive correlation with SNS. As a single factor, the photoperiod-sensitive ppd-D1b alleles had the largest effect on delaying heading, and these results showed that SL and SNS can eventually be increased. These findings confirmed that photoperiod-sensitive ppd-D1b is a potential means of increasing wheat yields.

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