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ARS Home » Pacific West Area » Davis, California » Nat'l Clonal Germplasm Rep - Tree Fruit & Nut Crops & Grapes » Research » Research Project #432154

Research Project: Integrated Conventional and Genomic Approaches to Almond Rootstock Development-SubAward to UC Riverside

Location: Nat'l Clonal Germplasm Rep - Tree Fruit & Nut Crops & Grapes

Project Number: 2032-21000-024-003-A
Project Type: Cooperative Agreement

Start Date: Oct 1, 2016
End Date: May 31, 2018

Disease testing of commercial and experimental rootstocks to produce high quality disease phenotype data. a) Evaluation of resistance/tolerance to root-knot, root-lesion, and ring nematodes. b) Determine the host staus of Prunus genotypes to root-knot nematode (Meloidogyne incognita), root lesion nematode (Pratylenchus vulnus), and ring nematode (Mesocriconema xenoplax).

A collection of such genotypes produced in the program of Malli Aradhya will be tested under small plot conditions. Plants will be raised, transplanted to field plots, and inoculated with known numbers of root-knot nematode M. incognita, ring nematode (M. xenoplax), or lesion nematode (P. vulnus). While root-knot and root-lesion nematodes probably can be co-inoculated, ring nematode may need to be tested separately. Final population densities of the nematodes that develop on the genotypes will be determined and compared to standards of susceptible or known resistant plants. This reproductive potential will be used to classify the species and the various genotypes for their potential utility as almond rootstocks. Preliminary evaluations will be conducted after one vegetation period but more reliable evaluations in the second year will be needed to confirm the information. All trials will include the standard rootstocks of Nemaguard, Hansen 536, and Marianna 2624 or Krymsk 86.