2009 Annual Report
Tree performance data to be collected will include: 1. Trunk circumference: initial and final yearly. 2. Annual pruning weights; Nutrient status-characterize nutritional deficiencies if and when symptoms arise. 3. At end of trial: Whole tree top weight, trunk diameter, etc. Annual assessments will be made of the extent and nature of AM fungal populations on tree roots.
A field trial was initiated in early 2008 to examine the effects of Arbuscular Mycorrhizal (AM) fungi on almond tree growth. The trial was planted on 7 February 2008 at the San Joaquin Valley Agricultural Sciences Center. Trees used in the study were either traditional bare root (1/2” caliper) Nonpareil/Nemaguard or 3/8” caliper ‘potted’ Nonpareil/Nemaguard trees. Three AM treatments were imposed on the bare root trees (control, field cultured AM and commercial cultured AM) and potted trees were utilized as either controls, or field cultured AM (five total tree treatments).Trunk caliper was measured during the 2008 growing season to provide an indication of relative tree growth. Performance evaluation will be continued for at least two years. DNA was extracted from spores and colonized roots by CTAB method. Primers from different region of AM fungal ribosomal genes were designed for identification AM fungal species. Glomus Mosseae, Glomus 3, Gigasproa rosea, Glomus intraradices were present in the soil and in colonized roots.
Methods used, as ADODR, for interacting with collaborators and stakeholders involved two meetings. At these meetings, discussions were held on research results, progress and future direction.