Lost and Found: Return of the Inverted Repeat in the Legume Clade Defined by Its Absence.

ABSTRACT: The plant genome comprises a coevolving, integrated genetic system housed in three subcellular compartments: the nucleus, mitochondrion, and the plastid. The typical land plant plastid genome (plastome) comprises the sum of repeating units of 130-160 kb in length. The plastome inverted repeat (IR) divides each plastome monomer into large and small single copy regions, an architecture highly conserved across land plants. There have been varying degrees of expansion or contraction of the IR, and in a few distinct lineages, including the IR-lacking clade of papilionoid legumes, one copy of the IR has been lost. Completion of plastome sequencing and assembly for 19 Medicago species and Trigonella foenum-graceum and comparative analysis with other IR-lacking clade taxa revealed modest divergenc

SUBMITTER: Choi IS 

PROVIDER: S-EPMC6496590 | biostudies-literature | 2019 Apr

REPOSITORIES: biostudies-literature