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Plant growth promotion by the interaction of a novel synthetic small molecule with GA‐DELLA function

Sukiran, Nur Afiqah; Pollastri, Susanna; Steel, Patrick G.; Knight, Marc R.

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Nur Afiqah Sukiran

Susanna Pollastri


Synthesized small molecules are useful as tools to investigate hormonal signaling involved in plant growth and development. They are also important as agrochemicals to promote beneficial properties of crops in the field. We describe here the synthesis and mode of action of a novel growth-promoting chemical, A1. A1 stimulates enhanced growth in both shoot and root tissues of plants, acting by increasing both dry and fresh weight. This suggests that A1 not only promotes uptake of water but also increases production of cellular material. A1 treatment of Arabidopsisleads to the degradation of DELLA growth-inhibitory proteins suggesting that A1-mediated growth promotion is dependent upon this mechanism. We performed genetic analysis to confirm this and further dissect the mechanism of A1 action upon growth in Arabidopsis. A quintuple dellamutant was insensitive to A1, confirming that the mode of action was indeed via a DELLA-dependent mechanism. The ga1-5gibberellin synthesis mutant was similarly insensitive, suggesting that to promote growth in ArabidopsisA1 requires the presence of endogenous gibberellins. This was further suggested by the observation that double mutants of GID1 gibberellin receptor genes were insensitive to A1. Taken together, our data suggest that A1 acts to enhance sensitivity to endogenous gibberellins thus leading to observed enhanced growth via DELLA degradation. A1 and related compounds will be useful to identify novel signaling components involved in plant growth and development, and as agrochemicals suitable for a wide range of crop species.


Sukiran, N. A., Pollastri, S., Steel, P. G., & Knight, M. R. (2022). Plant growth promotion by the interaction of a novel synthetic small molecule with GA‐DELLA function. Plant Direct, 6(4), Article e398.

Journal Article Type Article
Acceptance Date Mar 16, 2022
Online Publication Date Apr 26, 2022
Publication Date Apr 26, 2022
Deposit Date Jul 4, 2022
Publicly Available Date Jul 4, 2022
Journal Plant Direct
Electronic ISSN 2475-4455
Publisher Wiley Open Access
Peer Reviewed Peer Reviewed
Volume 6
Issue 4
Article Number e398


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Copyright Statement
© 2022 The Authors. Plant Direct published by American Society of Plant Biologists and the Society for Experimental Biology and John Wiley & Sons Ltd.<br /> <br /> This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.

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