Comprehensive analyses of different putative ploidy levels in organelle genomes of an important medicinal plant Polygonatum kingianum Collett & Hemsl.
Zhao J, Chen ZH, Zhang MX, Wang LH, Yang XY
Medicinal Plants
King Solomon's seal root—the same plant sold in herbal shops as a longevity tonic—is disappearing from wild hillsides due to overharvesting, and this genomic roadmap is a critical first step toward growing it reliably in cultivation so wild populations can recover.
Researchers studied two naturally occurring forms of a medicinal plant called king Solomon's seal: one with a normal chromosome count and one with double the usual amount. They found that the tiny power-generating structures inside plant cells (mitochondria) look quite different between the two forms—one has an extra chromosome and extra gene copies—while the structures that handle photosynthesis look almost the same. Despite these internal differences, the two forms are close enough to be considered the same species, which is good news for conservation planning.
Key Findings
The mitochondrial genome of the tetraploid (4-set) form has two chromosomes versus one in the diploid (2-set) form, plus one extra copy each of the nad3 and nad5 genes.
Chloroplast genomes were highly conserved across both ploidy levels, while simple sequence repeats (short repeated DNA segments) in both organelle genomes correlated with ploidy variation.
Phylogenetic and nucleotide substitution rate analyses found no significant divergence between the two forms, confirming they belong to a single species despite their structural differences.
chevron_right Technical Summary
Scientists compared the genetic blueprints inside the cells of two natural forms of king Solomon's seal—one with two sets of chromosomes, one with four—and found that the energy-producing organelle (mitochondria) is surprisingly complex and different between the two, while the photosynthesis organelle (chloroplast) looks nearly identical. This helps confirm they're one species and opens doors for better cultivation of a plant that is being over-harvested in the wild.
Abstract Preview
Polygonatum kingianum, a key species in traditional Chinese medicine, is increasingly valued for its medicinal and nutritional properties. However, wild resources are declining due to over-exploita...
open_in_new Read full abstractAbstract copyright held by the original publisher.
Species Mentioned
Was this useful?
Polyploidy and plant resilience to environmental stresses: Molecular mechanis...
The wheat in your bread, the strawberries in your garden, and the cotton in your clothes all carry extra chromosome sets that quietly help them survive heat ...
Polygonatum, also known as King Solomon's-seal, Solomon's seal, or sealwort, is a genus of flowering plants. In the APG III classification system, it is placed in the family Asparagaceae, subfamily Convallarioideae. It has also been classified in the former family Convallariaceae and, like many l...