Lathyrus × hammettii explained

Lathyrus × hammettii is a hybrid flowering plant within the genus Lathyrus and family Fabaceae. The hybrid was produced by artificially hybridizing L. odoratus with L. belinensis.[1]

History

The hybridization of these two species was first attempted by plant breeder Dr Keith Hammett, using the sweet pea cultivar Lathyrus odoratus 'Orange Dragon', L. belinensis and embryo rescue techniques.[2] The hybrid was attempted in hopes of producing a yellow sweet pea, which plant breeders have been attempting to create for decades.[3] [4] The F1 hybrid offspring produced from the cross were self sterile and possessed pink flowers. Multiple non yellow cultivars of Lathyrus × hammettii have been produced descending from those plants.

Mildew resistance

Lathyrus belinensis possesses genetics that exhibit mildew resistance.[5] L. odoratus is susceptible to mildew.[6] Hybrids produced between the two species were found to be resistant to the fungus Erysiphe pisi, which causes mildew in sweet peas.[7]

Notes and References

  1. 77143911-1 . Lathyrus × hammettii . 3 September 2024.
  2. Hammett . K. R. W. . Murray . B. G. . Markham . Kenneth R. . Hallett . I. C. . 1994 . Interspecific Hybridization between Lathyrus odoratus and L. belinensis . International Journal of Plant Sciences . 155 . 6 . 763–771 . 10.1086/297216 . 2475337 . 2024-09-03 . 2024-07-16 . https://web.archive.org/web/20240716221718/https://www.jstor.org/stable/2475337 . live .
  3. Web site: Edwards . Dawn . 2014 . Developing a yellow sweet pea . 2022-04-17 . www.drkeithhammett.co.nz . 2022-01-26 . https://web.archive.org/web/20220126165129/https://www.drkeithhammett.co.nz/assets/pdf/Developing-a-yellow-sweet-pea.pdf?updated=1629421138375 . live .
  4. Web site: Rice . Graham . 2021-09-30 . A yellow sweet pea at last? . 2024-09-03 . . 2024-01-27 . https://web.archive.org/web/20240127195038/https://www.rhs.org.uk/plants/plants-blogs/plants/september-2021/lathyrus-x-hammettii-primrose . live .
  5. Web site: Poulter, Taiaroa . R.T.M., G. . 2009 . Lathyrus belinensis from Turkey carries a mildew resistance allele that can be introgressed into Lathyrus odoratus . 2022-04-17 . www.researchgate.net.
  6. Book: Goswami, Ojha, Jamaluddin, M.S., B.M. . Fungi of India 1989-2001 . Scientific Publishers . 2004 . 9789387893009 . 54.
  7. Web site: Poulter, Harvey, Burritt . Russell, Lisa, David . 2003 . Qualitative resistance to powdery mildew in hybrid sweet peas . 2022-04-17 . www.researchgate.net.

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