Tuber Yield, Quality and Infestation Levels of Potato Genotypes, Resistant to the Root-Knot Nematode, Meloidogyne chitwoodi

Abstract As part of developing a routine potato cultivars resistance test to Meloidogyne chitwoodi , both the effect nematode density ( P i) and pot size on growth, tuber yield, quality infestation level were studied in glasshouse conditions. The study was carried out four experiments using cv. Desiree as control seven genotypes with single gene M. 1 genotype, Globodera pallida . Plants inoculated ranges i from 0.0625 256 J2 (g dry soil) ?1 log series. Haulm height, starch matter content (SDC) recorded. Additionally, harvested tubers experiment 2 stored for 240–300 days estimate actual at planting when used seed subsequent season. height positively affected increasing i’s negatively decreasing size. yield not ; they can be considered tolerant, having relative minimum m = 1. Three showed < 0.8, latter varying between 0.67 0.80 over sizes. reduction SDC equalled that indicating had no extra content. Quality, expressed tuber-knot index (TKI), accepting ware potatoes processing, below 10 all genotypes, except 2011M1. TKI values genotype MDG2 > 20 are accepted processing. fraction clean resistant significantly increased 91% compared 8% MDG2. Tuber infestation, number juveniles per gram soil after storage, regression averaged 0.35 while tested provided ca 0.002