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Seedling morphogenesis: when ethylene meets high ambient temperature

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Abstract

Unlike animals, plant development is plastic and sensitive to environmental changes. For example, Arabidopsis thaliana seedlings display distinct growth patterns when they are grown under different light or temperature conditions. Moreover, endogenous plant hormone such as ethylene also impacts seedling morphology. Ethylene induces hypocotyl elongation in light-grown seedlings but strongly inhibits hypocotyl elongation in etiolated (dark-grown) seedlings. Another characteristic ethylene response in etiolated seedlings is the formation of exaggerated apical hooks. Although it is well known that high ambient temperature promotes hypocotyl elongation in light-grown seedlings (thermomorphogenesis), ethylene suppresses thermomorphogenesis. On another side, high ambient temperature also inhibits the ethylene-responsive hypocotyl shortening and exaggerated hook formation in etiolated seedlings. Therefore, the simplest phytohormone ethylene exhibits almost the most complicated responses, depending on temperature and/or light conditions. In this review, we will focus on two topics related to the main theme of this special issue (response to high temperature): (1) how does high temperature suppress ethylene-induced seedling morphology in dark-grown seedlings, and (2) how does ethylene inhibit high temperature-induced seedling growth in light-grown seedlings. Controlling ethylene biosynthesis through antisense technology was the hallmark event in plant genetic engineering in 1990, we assume that manipulations on plant ethylene signaling in agricultural plants may pave the way for coping with climate change in future.

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Acknowledgements

We apologize to colleagues whose work is not mentioned here due to space limitation. Research in the Zhu lab was supported by the National Natural Science Foundation of China (31970256), the Natural Science Foundation of Jiangsu Province (BK20201371), the Qing Lan Project and the Priority Academic Program Development of Jiangsu Higher Education Institutions.

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  1. Jiangsu Key Laboratory for Biodiversity and Biotechnology, College of Life Sciences, Nanjing Normal University, Nanjing, 210023, China

    Junjie Shi & Ziqiang Zhu

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  1. Junjie Shi
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Shi, J., Zhu, Z. Seedling morphogenesis: when ethylene meets high ambient temperature. aBIOTECH 3, 40–48 (2022). https://doi.org/10.1007/s42994-021-00063-0

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