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.