CHINESE JOURNAL OF OIL CROP SCIENCES ›› 2023, Vol. 45 ›› Issue (1): 175-182.doi: 10.19802/j.issn.1007-9084.2021328

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Empirical research of dry heatwave simulation causing soybean staygreen syndrome

Jia-ming LIANG1(), Xian-shu MO1, Qian CAO1, Hong-mei CHEN1, Bing-zhe SHANG1, Ming-jun ZHANG2, Fu-qing LIANG2, De-xiao LI1()   

  1. 1.College of Agronomy, Northwest A&F University, Yangling 712100, China
    2.Institute of Yan′an Agriculture Sciences, Yan′an 716000, China
  • Received:2021-12-30 Online:2023-02-25 Published:2023-03-03
  • Contact: De-xiao LI E-mail:1372059729@qq.com;lidexiao@nwafu.edu.cn


In recent years, soybean staygreen syndrome, named ‘Zhengqing’ in China, has appeared occasionally in the summer soybean field of Huang-Huai-Hai regions, which becomes a serious threat to local soybean production. To explore the relationship between dry heatwave and Zhengqing, we conducted dry-heatwave-simulated treatments (HT) in artificial growth chamber from the full bloom stage (R2) to full pod stage (R4) with the duration of 3 d and 7 d, respectively. The results showed that soybean plants grown well after HT treatment for 3 d started from full bloom stage (R2), however, the HT treatment for 7 d caused various degree of staygreen syndrome of different soybean materials. The subsequent identification confirmed that severe reduction of effective pod number and normal seed number were detected after 7 d HT treatments at R2, R3, or R4 stages of soybean plants. The sequence of decrease amplitude compared with the control was R3 (85.14%) > R2 (62.12%) > R4 (50.97%) for effective pod number and R3 (81.02%) > R2 (60.00%) > R4 (56.32%) for normal seed number. In conclusion, staygreen syndrome could be induced by dry heatwave stress at R3 stage of soybean plants for 7 d. Soybean staygreen syndrome could be described as without seeds in pods, without pods, partial staygreen, and whole plant diapause. Regeneration of new leaves and flowers at lower nodes could be used an early diagnosis indicator of staygreen syndrome.

Key words: soybean, heatwave simulation, staygreen syndrome (zhengqing), empirical research

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