The Second International Oat Conference. of which these are the proceedings.was heldat Aberystwyth. 15-18 July.1985. In thebusiness meeting heldatthecloseof theFirstInternational Oat Workshop that was held at PennsylvaniaStateUniversity in 1982. an Internat i ona1 Organsi i ng Committee under the chairmanship of Or KJ Frey was electedto organisethe next conference.and Aberystwyth was proposed and agreed as the venue. The final date of the Second Conferenceand the out 1i ne of the programme. inc1udi ng selection of the rnain speakers. was agreed by the Internat i ona1 Committee but 1oca1 arrangements and finalisation of the programme were delegatedto a local sub-committee centredat the Welsh Plant Breeding Station. We wish to record our appreciationof the work done bythis localcommittee in assuming various organisational responsibilities. From the outsettherewas a firm committmentto makethe Conferenceas international as possible and every effortwas made both to provide a programme thatwouldattract participants from allpartsof the worldand to keep costs to a minimum so as to increasethe chances of potential delegatesbeing ableto attend. Alistof participantsis includedbut it is worthyof notethattwenty-three countr ies were represented. The Conferencewas organisedintoseven half-daysessions. Six of these covered differenttopics relevantto the improvement of oats and the seventhwas a visit to the Welsh PlantBreedingStationwhere laboratory and fieldwork ontheoatcrop was demonstrated.

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Opening of Conference.- Opening of Conference and Welcome to Delegates.- Session I: Genetic Resources and their Use in the Breeding of Oats.- Genetic resources and their use in oat breeding.- The use of disomic alien addition lines in the transfer of oat stem rust resistance to hexaploid oats.- Introgression of diploid wild Avena species into Avena sativa.- Interspecific hybrids in Avena.- Tissue culture induced variation in oats.- Phylogenetic relationships between Avena species revealed by the restriction endonuclease analysis of chloroplast and mitochondrial DNAs.- Molecular biology of oat storage protein genes: probes for evaluating germplasm variation.- Callus induction and plant regeneration from oat cultivars.- Differentiation of spikelet type in Avena in relation to the ploidy.- The identification of Avena chromosomes by means of C-banding.- Session I: Chairman's comments and summing up.- Session II: Pests and Diseases of Oats.- Diseases of Oats.- Pathogenicity of crown rust, stem rust and powdery mildew on oats in Europe and sources of resistance.- Adequate rust resistance in oats.- Genetic analysis of crown rust resistance and phytoalexin production in oats.- Variation and distribution of the oat crown rust fungus, Puccinia coronata avenae, in Britain in relation to breeding resistant oat cultivars.- Transgressive segregation for increased levels of adult plant resistance to mildew in oats.- The nature of horizontal resistance of oats to crown rust.- Resistance and tolerance in oats, Avena spp. to the cereal cyst nematode, Heterodera avenae.- Transmission of barley yellow dwarf virus isolates by the aphid Rhopalosiphum insertum (Walker).- Oat crown rust (Puccinia coronata avenae) races identified in the West Region of the USSR.- Session II: Chairman'scomments and summing up.- Session III: Efficiences of Breeding Methods For Oats.- Development of oat breeding methods.- Inheritance of primary: secondary seed weight ratios and secondary seed weight in oats.- Stability of German oat cultivars (Avena sativa L.): special consideration is given to non-typical oat florets.- Mass (gravimetric) selection in diseased nurseries.- Mass selection for improved milling performance.- Present status of research to develop useful semi dwarf oat germplasm.- Hybridising of oats utilising chemical hybridising agents.- Breeding winter oats - special considerations.- Pedigree of German oat cultivars and their identification by isoelectric focusing.- Session IV: Crop Physiology and Production Methods of Oats.- Crop physiological approaches to increased productivity in oats.- Some metabolic constraints to oat productivity.- Effects of genotype, seeding rate and grain yield components on the primary: secondary seed weight ratio in oats.- Breeding oats by selection of parental pairs from different ecological and geographical backgrounds.- The tolerance of oat varieties to Hoegrass (375 g/l diclofop-methyl).- The chemical control of wild oats in oats - a progress report.- Effects of herbicides on oats.- Improving winter hardiness in winter oats by seed treatment with PGRS.- Winter oat husbandry - results from ADAS trials 198284.- Session IV. Chairman's comments and summing up.- Session V: Quality, Use and Marketing Requirements for Oats.- World oats use and marketing.- Oat quality - present status and future prospects.- Oil and protein content in oats (Avena sativa L.).- Influence of fertiliser use on the quantity and composition of oil in oats.- Quality in oat breeding - a question of priorities.- Effect of lemma colour on grain qualityin oats, Avena sativa L..- Prospects for the naked oat crop in the UK and its agronomy, with particular reference to the spring oat cultivar Rhiannon.- Hull-less oats for the milling industry.- Oats - the health story.- Session V. Chairman's comments and summing up.- Session VI: World Status of Oats and Biological Constraints to Increased Production.- World status of oats and biological constraints to increased production.- Oat breeding at the University of Passo Fundo, Brazil, 19761984.- Oat production and breeding in Ijuí, RS, Brazil.- Performance of oats in the Quaker - South American Nursery 198384.- Selecting oats for North Island conditions: collaboration between New Zealand and Canada.- Oat breeding research at Pantnagar - India.- Oat breeding in the USSR and the initial breeding material.- Oat breeding and production in Hungary.- The oat crop in the UK.- Session VI. Chairman's comments and summing up.- Author Index.- List of participants.