Genome-wide analysis of oligopeptide transporters and detailed characterization of yellow stripe transporter genes in hexaploid wheat
Oligopeptide transporters (OPT) are integral cell membrane proteins that play a critical role in the transport of small peptides, secondary amino acids, glutathione conjugates, and mineral uptake. In the present study, 67 putative wheat yellow stripe-like transporter (YSL) proteins belonging to the subfamily of OPT transporters were identified. Phylogeny analysis resulted in the distribution of wheat YSLs into four discrete clades. The highest number of YSLs was present on the A genome and the chromosome 2 of hexaploid wheat. The identified wheat YSL genes showed differential expression in different tissues and during grain development suggesting the importance of this subfamily. Gene expression pattern of TaYSLs during iron starvation experiments suggested an early high transcript accumulation of TaYS1A, TaYS1B, TaYSL3, TaYSL5, and TaYSL6 in roots. In contrast, delayed expression was observed in shoots for TaYS1A, TaYS1B, TaYSL5, TaYSL12, and TaYSL19 as compared to control. Further, their expression under biotic and abiotic response emphasized their alternative functions during the plant growth and development. In conclusion, this work is the first comprehensive study of wheat YSL transporters and would be an important resource for prioritizing genes towards wheat biofortification.
KeywordsTriticum aestivum Yellow stripe-like transporters Iron transport Biofortification Iron starvation
The authors would like to thank the Executive Director, NABI, for facilities and support. The authors also thank Mr. Shrikant Mantri for discussion pertaining to bioinformatics work.
This research was funded by the NABI-CORE grant to AKP and partial support from DST-SERB grant (PDF/2016/001355) to PG. AK and GK acknowledge NABI-JRF Fellowships. PG thanks DST-SERB grant for fellowship.
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