The inverted repeat-lacking clade (IRLC) is a monophyletic clade of the flowering plant subfamily Faboideae (or Papilionaceae). Faboideae includes the majority of agriculturally-cultivated legumes. The name of this clade is informal and is not assumed to have any particular taxonomic rank like the names authorized by the ICBN or the ICPN.[3] The clade is characterized by the loss of one of the two 25-kb inverted repeats in the plastid genome that are found in most land plants.[6] It is consistently resolved in molecular phylogenies.[1][2][4][6][7][8][9][10][11][12][13] The clade is predicted to have diverged from the other legume lineages 39.0±2.4 million years ago (in the Eocene).[14] It includes several large, temperate genera such as Astragalus, Hedysarum, Medicago, Oxytropis, Swainsona, and Trifolium.
| Inverted repeat-lacking clade | |
|---|---|
 | |
| Galega officinalis | |
Scientific classification  | |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Clade: | Rosids |
| Order: | Fabales |
| Family: | Fabaceae |
| Subfamily: | Faboideae |
| Clade: | Meso-Papilionoideae |
| Clade: | Non-protein amino acid-accumulating clade |
| Clade: | Hologalegina |
| Clade: | Inverted repeat-lacking clade (Wojciechowski et al. 2000,[1] 2004[2]) Wojciechowski 2013[3] |
| Tribes[1][4] | |
| |
| Synonyms | |
| |
Description
This clade is composed of five traditional tribes (Cicereae, Fabeae, Galegeae, Hedysareae, and Trifolieae) and several genera that were traditionally placed in the tribe Millettieae: Afgekia, Callerya, Endosamara, Sarcodum, Wisteria, and possibly Antheroporum.[3] The first five of these genera have been transferred to the tribe Wisterieae, so that as revised, the tribe Millettieae falls outside the IRLC clade.[5] The clade is defined as:
"The most inclusive crown clade exhibiting the structural mutation in the plastid genome (loss of one copy of the ~25-kb inverted repeat region) homologous with that found in Galega officinalis, Glycyrrhiza lepidota, and Vicia faba, where these taxa are extant species included in the crown clade defined by this name."[3]
Uses
This clade includes edible plants such as garden peas, lentils, chickpeas, licorice, alfafa, among others.
References
External links
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