TY - JOUR
T1 - Lettuce (Lactuca sativa L.) germplasm resistant to bacterial leaf spot caused by race 1 of Xanthomonas hortorum pv. vitians (Brown 1918) Morinière et al. 2020
AU - Sandoya, Germán V.
AU - Rosenthal, Emma
AU - Simko, Ivan
AU - Rodrigues-Porto, Lis N.
AU - Wadlington, William H.
AU - Bull, Carolee T.
AU - Carroll, Amanda
N1 - Funding Information:
We would like to extend our thanks to the National Germplasm Plant System (NPGS) – Genetics Resources Information Network (GRIN) for providing seeds from lettuce plant introductions. In Florida, we thank student intern Isabel Rivera for her help with pathogen culture. The authors would also like to thank Jose Orozco and Gabriel Ramos at the USDA-ARS in Salinas, CA for their invaluable help with greenhouse screenings. The mentioning of trade names or commercial products in this publication is solely for the purpose of providing specific information and does not imply recommendation or endorsement by the USDA.
Funding Information:
The authors would like to acknowledge funding from the Specialty Crop Block Program Florida award number 15SCBGPFL0038, California award number SCB14044, the Specialty Crop Multi State Program award number AGR00018172, California Leafy Greens Research Board, the Florida Vegetable Exchange, the Hatch Project FLA-ERC-005599, and the NSF GRFP Grant No. 2018265841.
Publisher Copyright:
© 2022, The Author(s) under exclusive licence to Società Italiana di Patologia Vegetale (S.I.Pa.V.).
PY - 2022/8
Y1 - 2022/8
N2 - Bacterial Leaf Spot (BLS) is a disease that threatens lettuce (Lactuca sativa L.) production in warmer temperatures and high relative humidity, conditions that are conducive to unpredictable disease outbreaks and thus potentially resulting in total crop loss. BLS also causes problems in other major lettuce producing areas in the US and worldwide. To date, three races of the pathogen, Xanthomonas hortorum pv. vitians (Brown in J Agric Res 13:367–388, 1918; Morinière et al. in Syst App Microbiol 43:1260–1287, 2020 formerly known as X. campestris pv. vitians, were described in the US and Canada; though only race 1 has been confirmed thus far in Florida. Lettuce germplasm with a diverse set of resistance alleles is needed to improve resistance to BLS utilized in current commercial cultivars. In this study, plant introductions (PIs) from the National Plant Germplasm System (NPGS) and heirloom lettuce cultivars were tested against three isolates of the pathogen in Florida and two isolates in California. PI 667690 and PI 667709 were identified to be resistant to isolates of race 1 from both Florida and California. Allelism tests indicate that resistance found in these PIs is allelic to Xcvr (Xanthomonas campestris vitians resistance), a previously identified resistance gene detected in PI 358001–1. The two new sources of resistance offer a different set of morphological characteristics that can be useful in breeding programs than those found in PI 358001–1.
AB - Bacterial Leaf Spot (BLS) is a disease that threatens lettuce (Lactuca sativa L.) production in warmer temperatures and high relative humidity, conditions that are conducive to unpredictable disease outbreaks and thus potentially resulting in total crop loss. BLS also causes problems in other major lettuce producing areas in the US and worldwide. To date, three races of the pathogen, Xanthomonas hortorum pv. vitians (Brown in J Agric Res 13:367–388, 1918; Morinière et al. in Syst App Microbiol 43:1260–1287, 2020 formerly known as X. campestris pv. vitians, were described in the US and Canada; though only race 1 has been confirmed thus far in Florida. Lettuce germplasm with a diverse set of resistance alleles is needed to improve resistance to BLS utilized in current commercial cultivars. In this study, plant introductions (PIs) from the National Plant Germplasm System (NPGS) and heirloom lettuce cultivars were tested against three isolates of the pathogen in Florida and two isolates in California. PI 667690 and PI 667709 were identified to be resistant to isolates of race 1 from both Florida and California. Allelism tests indicate that resistance found in these PIs is allelic to Xcvr (Xanthomonas campestris vitians resistance), a previously identified resistance gene detected in PI 358001–1. The two new sources of resistance offer a different set of morphological characteristics that can be useful in breeding programs than those found in PI 358001–1.
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U2 - 10.1007/s42161-022-01123-0
DO - 10.1007/s42161-022-01123-0
M3 - Article
AN - SCOPUS:85128428712
SN - 1125-4653
VL - 104
SP - 993
EP - 1008
JO - Journal of Plant Pathology
JF - Journal of Plant Pathology
IS - 3
ER -