Abstract
NAC transcription factors are the bonafide regulators of growth and stress-signaling. Disparate signals converge at NAC-mediated transcriptional programming to initiate a cellular response. Like other stress regulators such as DREB, DDF1, bZIP, PYL, NAC-mediated stress adaptation often compromises beneficial agronomic traits resulting in yield-penalty. Overexpression of these TFs can cause metabolic and hormonal perturbations that exert growth-retardation by activating ABA-hypersensitivity, chloroplast-degradation, or carbon-starvation, resulting in growth arrest and decline in photosynthetic activity. In addition, functional conservation of non-native members is unpredictable due to the non-conserved C-terminal part of the NAC proteins, hence limiting the utilization of well-studied orthologous genes in legumes. The growth/tolerance trade-off is an unresolved mystery. The co-occurrence of multiple stresses further perplexes the broad-range stress improvement of legume crops. To overcome the trade-offs, we need to understand the growth checkpoints that crosstalk with mediated by the stress-responsive gene candidate. Interestingly, NAC proteins appear to be the branch-point of ABA-dependent and ABA independent signaling hence can activate/repress a non-overlapping set of genes associated with stress response and growth to avoid the detrimental crosstalk. Indeed, a versatile NAC member improving both stress adaptation and yield simultaneously through synergistic crosstalk holds the key for sustainable legume improvement. Moreover, the successful manipulation of stress signaling depends on non-interfered ABA signaling of stress responses and growth, as well as strengthening of carbon assimilation. Photosynthesis plays a central role in plant carbohydrate metabolism and stress recovery by restoring the energy status. Hormones and carbohydrates participate together in a complex stress-signal transduction system. For instance, ABA antagonistically regulates growth and sugar signals. Native NAC candidates isolated from robust genetic sources like cowpea can be a useful approach to overcome trade-offs and achieve a desired phenotype. This review provides new insights to improve legume yield via transcriptional reprogramming.
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Abbreviations
- ABA:
-
Abscisic acid
- ATAF:
-
Arabidopsis transcription activation factor
- NAC:
-
NAM/ATAF1//CUC2
- NACBS:
-
NAC binding site
- NLS:
-
Nuclear localization signal
- ROS:
-
Reactive oxygen species
- SAM:
-
Shoot apical meristem
- TF:
-
Transcription factor
- TAR:
-
Transactivation region
- TMM:
-
Transmembrane motif
- VuNAC:
-
Vigna unguiculata NAC
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This work was supported by a research grant from the Program Support Grant Phase-II from the Department of Biotechnology, Government of India to L.S. (BT/PR13560/COE/34/44/2015).
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Srivastava, R., Sahoo, L. Balancing yield trade-off in legumes during multiple stress tolerance via strategic crosstalk by native NAC transcription factors. J. Plant Biochem. Biotechnol. 30, 708–729 (2021). https://doi.org/10.1007/s13562-021-00749-y
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DOI: https://doi.org/10.1007/s13562-021-00749-y