Strigolactones: multi-level regulation of biosynthesis and diverse responses in plant abiotic stresses
- 243 Downloads
Strigolactones (SLs) are a small class of diverse metabolites derived from the carotenoid pathway. These active biomolecules are a recent inclusion to the list of non-traditional phytohormones or plant growth regulators. Previous reports and articles have discussed their pro-regulatory roles in plant growth, development, signaling and delay of senescence. However, the multi-level control of SL biosynthesis is less known. The anabolic genes are strictly regulated through synchronized co-operation between crucial phytohormones. Epigenetic and microRNA-mediated post-transcriptional regulation fine tunes the cellular accumulation of these putative phytohormones. The question now arises that why such multi-level intricate regulation at all is required for SLs, which were originally detected as under-rated germination and rhizosphere stimulants. This review answers the question in the backdrop of the positive roles of SLs in promoting abiotic stress resilience across diverse plant species. SLs reportedly accumulate in the plant tissues in response to environmental sub-optimal conditions like drought, salinity, temperature, nutrient deprivation and oxidative stresses. Fluctuations in the light quality and intensity also trigger variable accumulation of SLs, indicating their potential in regulating light stress as well. Though the exact roles of SLs have not yet been characterized, it is predicted that they possibly induce the expression of downstream osmolytes to maintain metabolic homeostasis in the stressed cells. Thus, exogenous treatments or transgenic approaches for higher SL bioaccumulation can be potential strategies for developing multiple abiotic stress tolerance in crops and plants.
KeywordsStrigolactones Phytohormones Molecular interactions Epigenetic regulation Post-transcriptional control Abiotic stress Multi-stress tolerance
Financial assistance from Council of Scientific and Industrial Research (CSIR), Government of India, through the research Grant [38(1387)/14/EMR-II] to Dr. Aryadeep Roychoudhury is gratefully acknowledged. The authors are also thankful to University Grants Commission, Government of India, for providing fellowship to Mr. Aditya Banerjee.
- Banerjee A, Roychoudhury A (2016) Plant responses to light stress: oxidative damages, photoprotection and role of phytohormones. In: Ahammed GJ, Yu J-Q (eds) Plant hormones under challenging environmental factors. Springer, Dordrecht, pp 181–213Google Scholar
- Banerjee A, Roychoudhury A (2018b) Abiotic stress, generation of reactive oxygen species, and their consequences: an overview. In: Singh VP, Singh S, Tripathi D, Mohan Prasad S, Chauhan DK (eds) Revisiting the role of reactive oxygen species (ROS) in plants: ROS Boon or bane for plants?. Wiley, pp 23–50Google Scholar
- Boyer FD, de Saint Germain A, Pillot JP, Pouvreau JB, Chen VX, Ramos S et al (2012) Structure-activity relationship studies of strigolactone-related molecules for branching inhibition in garden pea: molecule design for shoot branching. Plant Physiol 159:1524–1544CrossRefPubMedPubMedCentralGoogle Scholar
- Islam S, Griffiths CA, Blomstedt CK, Le T-N, Gaff DF et al (2013) Increased biomass, seed yield and stress tolerance is conferred in Arabidopsis by a novel enzyme from the resurrection grass Sporobolus stapfianus that glycosylates the strigolactone analogue GR24. PLoS One 8:e80035CrossRefPubMedPubMedCentralGoogle Scholar
- Roychoudhury A, Banerjee A (2017) Abscisic acid signaling and involvement of mitogen activated protein kinases and calcium-dependent protein kinases during plant abiotic stress. In: Pandey G (ed) Mechanism of plant hormone signaling under stress, vol 1. Wiley, pp 197–241Google Scholar