The versatile role of glucose signalling in regulating growth, development and stress responses in plants
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REVIEW ARTICLE
The versatile role of glucose signalling in regulating growth, development and stress responses in plants Harshita B. Saksena1 • Manvi Sharma1 • Dhriti Singh1 • Ashverya Laxmi1 Received: 15 July 2020 / Accepted: 21 September 2020 Ó Society for Plant Biochemistry and Biotechnology 2020
Abstract Sugars as an energy source and a signalling molecule are indispensible for growth, development and stress responses in plants. Among sugars, glucose (Glc) has been identified to perform a key role in regulating various cellular and developmental processes in plants. This comprehensive review highlights the crosstalk of glucose signalling with auxin, cytokinin and brassinosteroid signalling in controlling several aspects of plant development including root growth deviation, root waving and coiling, lateral root emergence, hypocotyl elongation, etc. through a Hexokinase 1 dependent and independent pathway in Arabidopsis. It also provides an insight on the role of Glc-mediated target of rapamycin signalling in modulating various abiotic stresses like nutrient deficiency stress, heat stress, oxidative stress etc. The review also discusses about sugar inducible FCS-Like Zinc Finger genes in modulating SNF1-related protein kinase 1 signalling to coordinate growth and stress responses in plants. Therefore, glucose signalling in concert with diverse signalling pathways and via regulating certain genes contributes to numerous cellular processes to control development and stress responses in plants. Keywords Arabidopsis glucose phytohormones signalling crosstalk plant growth and development abiotic stress Abbreviations BAP 6-Benzylaminopurine BR Brassinosteroid CK Cytokinin EODFR End of day far-red FLZ FCS-like zinc finger Glc Glucose HLP1 Hikeshi-like protein1 HXK1 Hexokinase1 IAA Indole-3-acetic acid NPA 1-N-Naphthylphthalamic acid RSA Root system architecture SnRK1 SNF1-related protein kinase 1 TOR Target of rapamycin WGD Whole genome duplication
Harshita B. Saksena, Manvi Sharma, Dhriti Singh have contributed equally to this work. & Ashverya Laxmi [email protected] 1
Lab 203, National Institute of Plant Genome Research, Aruna Asaf Ali Marg, New Delhi 110067, India
WT
Wild type
Introduction Plants fix light energy into the form of sugars to fulfil their requirement of energy. Sugars apart from being the primary source of carbon and energy also function as signaling molecules to regulate various plant processes from growth and development to metabolism and stress response. Sugars translate the nutrient status of plant for growth and development, enabling them to adapt in response to dynamic nutrient condition of the environment (Li and Sheen 2016). Glucose (Glc) is the second most abundant sugar in plants and has been reported to play very important role in plant growth and development. Glc is sensed by Hexokinase 1(HXK1) which has role in metabolism as well as acts as a glucose sensor (Li and Sheen 2016). Apart from this, Regulator of G-protein signaling (RGS1) also acts as an external gluc
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