Basic information

Common Name: Maca
Family: Brassicaceae
Genus: Lepidium meyenii
Species: Lepidium meyenii
Ref: )

Lepidium meyenii is an herbaceous, low-growing, rosette-like plant of frilly leaves with an enlarged tuberous fleshy underground organ formed by the taproot and the lower part of the hypocotyl. The plant grows to a height of 10-20cm. It’s root is 3-5cm in diameter and 15 cm in circumference at the widest point. Authorities do not agree whether the plant is a biennial or perennial plant. The plant matures about 8 months after planting.

( Ref: wikipedia )

Species tree

Figture: Representative members in different lineages of Brassicaceae family. Phylogenetic tree was generated from 464 single-copy orthologous genes using the maximum-likelihood method. The scale bar shows the expected number of amino acid substitutions per residue.

(Ref:Jing Zhang et al.,2016)

Growth environment

Figture: (A) Cultivation area of maca in the central Andes region (circled in red).

(B) Rapid elevation of the Andes Mountains between 5 and 10 million years ago.

(Ref:Jing Zhang et al.,2016)

Genome statistics

Summary of the L. meyenii Genome Assembly Features.

Estimated genome size (Mb) 751
Assembly Statistics
De novo assembly size (Mb) 743
No. of N50 contigs 2418
N50 contig length (bp) 81780
No. of N50 scaffolds 92
N50 scaffold length (bp) 2420765
No. of N90 contigs 122974
N90 contig length (bp) 175
No. of N90 scaffolds 93194
N90 scaffold length (Mb) 175
Transposable elements content 47.65%
Gene annotation Statistics
Total no. of protein-coding genes 96 417
Total no. of exons 475645
Average no. of exons per gene 4.93
Average exon size (bp) 234.92
Average intron length (bp) 222.76
Total no. of non-protein-coding genes 18885
(Ref:Jing Zhang et al.,2016)

Whole genome duplication

Figture: Phylogenetic tree and divergence time of five plant species. Phylogenetic tree was generated from 503 single-copy orthologous genes using the maximum-likelihood method. Time (Ma) is listed in brackets, and corresponds to the fossil time scale. The time range for divergence is shown in gray areas. Approximate positions of the paleo-WGD events (a, b, g) are indicated by inverted triangles. Approximate positions of the species-specific WGD events are indicated by squares.

(Ref:Jing Zhang et al.,2016)

Schematic graph

Figture: Schematic graph of the collinear relationships between A. thaliana chromosome 1 and maca scaffolds. See Supplemental Figure 5 for additional collinear relationship graphs.

(Ref:Jing Zhang et al.,2016)