Registration of GA‐BatSten1 and GA‐MagSten1, two induced allotetraploids derived from peanut wild relatives with superior resistance to leaf spots, rust, and root‐knot nematode

• Published in: Journal of plant registrations 2021-05, Vol.15 (2), p.372-378
• Main Authors: Bertioli, D.J., Gao, D., Ballen‐Taborda, C., Chu, Y., Ozias‐Akins, P., Jackson, S.A., Holbrook, C.C., Leal‐Bertioli, S.C.M.
• Format: Article
• Language: English
• ISSN: 1936-5209; 1940-3496
• DOI: 10.1002/plr2.20133

Wild relatives of peanut harbor alleles that confer strong resistance to diseases and pests and adaptation to environmental stresses, traits that frequently cannot be found in Arachis hypogaea. However, most wild species are diploid, while cultivated peanut (A. hypogaea L.) is tetraploid. When crossed, they produce sterile progeny, thus hindering their direct use in peanut breeding. To make the alleles of three wild species accessions directly available for breeding, we developed at the University of Georgia two fertile artificially induced allotetraploids (also known as amphidiploids or neotetraploids): GA‐BatSten1 (Reg. no. GP‐239, PI 695418) and GA‐MagSten1 (GP‐240, PI 695417). They derive from crosses between wild diploid species of peanut, A. batizocoi × A. stenosperma, and A. magna × A. stenosperma, respectively. Cuttings from the sterile diploid F1s were treated with colchicine. From some of these cuttings, fertile induced tetraploid seed were produced. These induced tetraploids are compatible with cultivated peanut, carry resistance to early and late leaf spot and root‐knot nematode, and are being used in breeding programs in the United States for the production of resistant cultivars. Core Ideas Wild relatives of peanut harbor alleles that confer strong resistances to diseases and pests. Most wild species are diploid while cultivated peanut (Arachis hypogaea) is tetraploid. Development of wild‐derived tetraploids is essential for allele transfer to peanut. We produced two fertile induced allotetraploids, GA‐BatSten1 and GA‐MagSten1. GA‐BatSten1 and GA‐MagSten1 are resistant to pests and diseases and available for breeding.