ARS | Publication request: HERITABILITY OF RESISTANCE TO COMMON SCAB IN DIPLOID POTATOES

Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: March 11, 1998
Publication Date: N/A

Technical Abstract: Common scab of potato (Solanum tuberosum L.), caused by the soilborne bacterium Streptomyces scabies (Thaxter) Lambert & Loria, produces superficial, raised or pitted lesions on susceptible tubers. Heritability of resistance to common scab in a diploid hybrid potato population (S. phureja-S. stenotomum) was estimated for amount of surface area infected (AI) and type of lesion (LI) using mid-parent offspring regression. Parents were evaluated in scab infested plots in Presque Isle, ME in 1993 and their offspring were evaluated in scab infested plots in Becker, MN and Presque Isle, ME in 1997. Estimates of heritability for LI were 0.09 +(-) 0.03 and 0.11 +(-) 0.03 for offspring evaluated in MN and ME, respectively. Estimates of heritability for LI were 0.35 +(-) 0.08 and 0.28 +(-) 0.10 for offspring evaluated in MN and ME, respectively. Broad-sense heritabilities on a mean basis and their exact 95% confidence intervals for AI and LI were estimated at 0.42 (0.28, 0.54) and 0.50 (0.38, 0.60), respectively. Non-additive genetic variance is important in resistance to common scab in this population.