caa a22 4500 44532273X CHVBK 20180317142709.0 cr unu---uuuuu 170323e20111101xx s 000 0 eng 10.1007/s10681-011-0433-y doi (NATIONALLICENCE)springer-10.1007/s10681-011-0433-y Genetic diversity analysis of avocado ( Persea americana Miller) rootstocks selected under greenhouse conditions for tolerance to phytophthora root rot caused by Phytophthora cinnamomi [Elektronische Daten] [G. Douhan, E. Fuller, B. McKee, E. Pond] Phytophthora cinnamomi, the causal agent of Phytophthora Root Rot (PRR) of avocado, is the most serious disease of avocado worldwide. The development of tolerant rootstocks to control PRR has proven to be an effective means to control the disease. However, using traditional breeding approaches can take over a decade to produce results and there has been a limited use to integrate molecular data into breeding efforts. Therefore, the objective of this work was to use amplified fragment length polymorphism (AFLP) to genetically characterize greenhouse selected PRR tolerant rootstocks, some that had been field-tested and others that had not. Sixty-one polymorphic markers were identified among the 83 cultivars/selections tested. Based on UPGMA analysis, extensive genotypic diversity was found with the closest genotypes differing by six markers. No obvious trends were observed based on the cluster analysis with regards to known tolerant and susceptible rootstocks but rootstocks that have been field-tested and determined to be very tolerant rootstocks such as Latas, Dusa, PP14 (Uzi), PP4 (Zentmyer), and PP24 (Steddom) were distributed across the tree. This suggests that the same mechanisms for resistance may not be shared among these various selections. Therefore, these best-performing and most genetically diverse rootstocks will be combined in future breeding efforts to potentially pyramid diverse sources of resistance into future selections. Springer Science+Business Media B.V., 2011 AFLP nationallicence Avocado nationallicence Phytophthora cinnamomi nationallicence Rootstocks nationallicence Douhan G. Department of Plant Pathology and Microbiology, University of California, 92521, Riverside, CA, USA aut Fuller E. Department of Plant Pathology and Microbiology, University of California, 92521, Riverside, CA, USA aut McKee B. Department of Plant Pathology and Microbiology, University of California, 92521, Riverside, CA, USA aut Pond E. Department of Plant Pathology and Microbiology, University of California, 92521, Riverside, CA, USA aut Euphytica Springer Netherlands 182/2(2011-11-01), 209-217 0014-2336 182:2<209 2011 182 10681 https://doi.org/10.1007/s10681-011-0433-y text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10681-011-0433-y text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Douhan G. Department of Plant Pathology and Microbiology, University of California, 92521, Riverside, CA, USA aut NATIONALLICENCE 700 1- Fuller E. Department of Plant Pathology and Microbiology, University of California, 92521, Riverside, CA, USA aut NATIONALLICENCE 700 1- McKee B. Department of Plant Pathology and Microbiology, University of California, 92521, Riverside, CA, USA aut NATIONALLICENCE 700 1- Pond E. Department of Plant Pathology and Microbiology, University of California, 92521, Riverside, CA, USA aut NATIONALLICENCE 773 0- Euphytica Springer Netherlands 182/2(2011-11-01), 209-217 0014-2336 182:2<209 2011 182 10681 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer