The peanut genome is being sequenced and analyzed as part of the Peanut Genomic Initiative
, in order to accelerate breeding progress and get more productive, disease-resistant, stress-tolerant varieties to farmers. The two diploid progenitors have been sequenced and are available,
along with predicted genes and descriptions
. The genomes of the diploid progenitors will be used to help identify and assemble the similar chromosomes in cultivated peanut.
Cultivated peanut, Arachis hypogaea
, is an allotetraploid (2n=4x=40) that contains two complete genomes, labeled the A
genomes. A. duranensis
(2n=2x=20) has likely contributed the A
genome, and A. ipaensis
has likely contributed the B
genome. It may be helpful to remember these two associations by using the mnemonic: "A" comes before "B" and "duranensis" comes before "ipaensis".
Because of the difficulty of assembly a tetraploid genome, the two diploids, A. duranensis
and A. ipaensis
, have been sequenced and assembled first. Together these provide a good initial basis for the tetraploid genome. Additionally, the two will help guide assembly of the tetraploid genome. Sequencing work on the tetraploid genome is underway; stay tuned for updates in 2015.
More about Arachis ...
(Download a short review on 'Arachis duranensis
, Arachis ipaensis
, and the Origins of Cultivated Peanut')
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if you have questions, requests, or data to contribute.