Premium
A single recessive gene conferring short leaves in romaine × Latin type lettuce ( Lactuca sativa L.) crosses, and its effect on plant morphology and resistance to lettuce drop caused by Sclerotinia minor Jagger
Author(s) -
Hayes Ryan J.,
Wu BoMing,
Subbarao Krishna V.
Publication year - 2011
Publication title -
plant breeding
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.583
H-Index - 71
eISSN - 1439-0523
pISSN - 0179-9541
DOI - 10.1111/j.1439-0523.2010.01822.x
Subject(s) - biology , lactuca , cultivar , botany , dwarfing , horticulture , plant disease resistance , gene pool , major gene , gene , genetics , genetic diversity , population , rootstock , demography , sociology
With 1 figure and 5 tablesAbstract Understanding the relationship between plant morphology and disease resistance is crucial to successful lettuce breeding. Latin type cultivars are a potential useful source of resistance to Sclerotinia minor for breeding resistant romaine cultivars. However, resistance in Latin cultivars may be conditioned by their relatively short stature. The objective of this research was to determine the segregation for plant height and the relationship between plant height and S. minor resistance in romaine × Latin crosses. The frequency of short plants was conditioned by a single recessive gene in F 1 , F 2 and F 3 families from nine romaine × Latin crosses tested in 2007, 2008 and 2009 field experiments. The gene, named short leaf 1 ( sl1 ), affects only leaf length in rosette plants and is morphologically distinct from other dwarfing genes. In two S. minor ‐infested field experiments with 75 F 3 romaine × ‘Eruption’ families, no difference in disease incidence was detected between short ( sl1sl1 ), tall ( Sl1Sl1 ) or segregating families. Therefore, development of resistant romaine cultivars from crosses with ‘Eruption’ is feasible.