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. 2021 May 27;12(6):822. doi: 10.3390/genes12060822

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Phylogenetic relationship of introns in chloroplast tRNAs (from angiosperms, gymnosperms, ferns, bryophytes, and algae). Introns of chloroplast tRNA grouped with that of cyanobacteria illustrated a common cyanobacterial origin of introns in chloroplasts. Introns in chloroplast tRNA^Val of Gossypium populifolium and Zea mays indicated the same evolutionary ancestors of corn and cotton introns. Introns present in the same tRNA of plants (tRNA^Ile and tRNA^Leu) tended to appear in the same branch, showing their close phylogenetic relationship.