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Exogenous application of coronatine and alginate oligosaccharide to maize seedlings enhanced drought tolerance at seedling and reproductive stages

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  • Guo, Yuling
  • Huang, Guanmin
  • Wei, Zexin
  • Feng, Tianyu
  • Zhang, Kun
  • Zhang, Mingcai
  • Li, Zhaohu
  • Zhou, Yuyi
  • Duan, Liusheng

Abstract

Plant growth regulators (PGRs) play crucial roles in maize drought tolerance. However, most of the studies are focused on seedling stage under greenhouse conditions, little is known on the effects of grain yields at later growth stage under field environment. It is hypothesized that exogenous application of PGRs can increase maize drought tolerance at different growth stages under field conditions. Here we used alginate oligosaccharide (AOS) and coronatine (COR) to investigate the effects of these two PGRs on maize drought tolerance in a two-year field experiment. The results showed that both COR and AOS treatments reduced leaf water loss and significantly increased the relative leaf water content by 12.6% and 13.0%, thus significantly decreasing superoxide anion accumulation by 49% and 42% in maize seedlings. There was no big difference between these two treatments in the seedling stage. In the subsequent reproductive growth period, although both COR and AOS treatments significantly increased leaf photosynthesis and above-ground growth, including photosynthetic rate by 41% and 33%, relative chlorophyll content (SPAD value) by 8.0% and 6.5%, leaf area by 22% and 15%, plant height by 8.3% and 5.9%, dry matter accumulation by 23% and 17%, respectively, under drought conditions, the effect of COR was superior to the AOS, as evidenced by membership function values of COR treatment were 0.12 and 0.08 larger than that of AOS treatment in 2020 and 2021, respectively. Ultimately, COR and AOS treatments significantly increased the grain yields by 21.7% and 16.2% in 2020, 22.3% and 15.7% in 2021, respectively, under drought conditions. Path analysis showed both PGRs increased final grain yields by increasing thousand-kernel weight (TKW). While the TKW increase with COR treatment was mainly due to the increase of relative chlorophyll content (SPAD value), AOS treatment mainly increased dry matter accumulation under drought conditions.

Suggested Citation

  • Guo, Yuling & Huang, Guanmin & Wei, Zexin & Feng, Tianyu & Zhang, Kun & Zhang, Mingcai & Li, Zhaohu & Zhou, Yuyi & Duan, Liusheng, 2023. "Exogenous application of coronatine and alginate oligosaccharide to maize seedlings enhanced drought tolerance at seedling and reproductive stages," Agricultural Water Management, Elsevier, vol. 279(C).
    • Handle: RePEc:eee:agiwat:v:279:y:2023:i:c:s0378377423000501
    DOI: 10.1016/j.agwat.2023.108185
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    References listed on IDEAS

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    1. Haiyue Yu & Yubin Wang & Jiapeng Xing & Yushi Zhang & Liusheng Duan & Mingcai Zhang & Zhaohu Li, 2021. "Coronatine Modulated the Generation of Reactive Oxygen Species for Regulating the Water Loss Rate in the Detaching Maize Seedlings," Agriculture, MDPI, vol. 11(7), pages 1-15, July.
    2. Chen, Qi & Qu, Zhaoming & Ma, Guohua & Wang, Wenjing & Dai, Jiaying & Zhang, Min & Wei, Zhanbo & Liu, Zhiguang, 2022. "Humic acid modulates growth, photosynthesis, hormone and osmolytes system of maize under drought conditions," Agricultural Water Management, Elsevier, vol. 263(C).
    3. Min-Jie Cao & Yu-Lu Zhang & Xue Liu & Huan Huang & X. Edward Zhou & Wen-Long Wang & Ai Zeng & Chun-Zhao Zhao & Tong Si & Jiamu Du & Wen-Wu Wu & Fu-Xing Wang & H. Eric Xu & Jian-Kang Zhu, 2017. "Combining chemical and genetic approaches to increase drought resistance in plants," Nature Communications, Nature, vol. 8(1), pages 1-12, December.
    4. Cai, Fu & Zhang, Yushu & Mi, Na & Ming, Huiqing & Zhang, Shujie & Zhang, Hui & Zhao, Xianli, 2020. "Maize (Zea mays L.) physiological responses to drought and rewatering, and the associations with water stress degree," Agricultural Water Management, Elsevier, vol. 241(C).
    5. Liu, E.K. & Mei, X.R. & Yan, C.R. & Gong, D.Z. & Zhang, Y.Q., 2016. "Effects of water stress on photosynthetic characteristics, dry matter translocation and WUE in two winter wheat genotypes," Agricultural Water Management, Elsevier, vol. 167(C), pages 75-85.
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