Nitrogen fixation research progress: Proceedings of the 6th by J. Attewell, F. A. Bliss (auth.), H. J. Evans, P. J.

By J. Attewell, F. A. Bliss (auth.), H. J. Evans, P. J. Bottomley, W. E. Newton (eds.)

This Symposium, held August 4-10, 1985 at the campus of Oregon kingdom collage in Corvallis, is the 6th of a sequence of overseas symposia excited by vast facets of the fixation of nitrogen fuel by way of organic and chemical capacity. the 1st symposium of this sequence used to be held in Pullman, Washington (1974), the second one in Salamanca, Spain (1976), the 3rd in Madison, Wisconsin (1978), the fourth in Canberra, Australia (1980) and the 5th in Noordwij~erhout, The Netherlands (1983). sooner than the association of those symposia, small teams of often not more than 10 or 12 of the now "old shield" within the box met in a few vague locations, together with Butternut Lake, Wisconsin, Sanabel Island, Florida and Camp Sage chicken in California, to debate advancements within the box. quandary approximately an power main issue within the nineteen seventies served as an impetus for the association of workshops and preparatiol. of courses urging executive firms to supply cash for the help of a number of overlooked parts within the box, together with the genetics of nitrogen-fixing organisms and the biology of Frankia. In in retrospect, it turns into obvious that there were drastic adjustments within the volume of analysis help within the box and within the contents of the courses of the ongoing sequence of symposia.

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Additional info for Nitrogen fixation research progress: Proceedings of the 6th international symposium on Nitrogen Fixation, Corvallis, OR 97331, August 4–10, 1985

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24, 553-558. Phillips DA et al (1985) Crop Sci. 25, In press. 37 AN EVALUATION OF TROPICAL PHASEOLUS VULGARIS GENOTYPES FROM A BREEDING PROGRAM FOR IMPROVED NITROGEN FIXATION J. A. Kipe-Nolt and K. E. Giller CIAT, AA 6713, Cali, Colombia and Rothamsted Expt. St. K. P. vulgaris genotypes (RIZ lines) from a program of crossing and recurrent selection for N2-fixation (CIAT 1983) were evaluated for their N2-fixation ability together with early ancestral genotypes. Comparisons were limited to genotypes with similar growth habit and duration.

Summary of soybean grafting studies. 14 15 j£ ~ 16 B= Braggi W= Williamsi 382= nts382i 1007= ntsl007, 1116= 49= nod49i. nts382 and ntsll16 are non-allelic and give supernodulation and hypernodulation respectively. Results for nod49 also hold true for nod139. Allelic mutants ntsl007 and nts 382 gave identical results if grafted with nod49 or nod139. ntsll16i Nitrogenase activities of nodules induced on mutant nts382 under 0 mM nitrate supplementation were about one third that of control nodules.

The mutants fell into at least 3 complementation groups with nts382, ntsl007 and nts50l being in group A, ntsll16 group Band nts733 group C. Mutant ntsl007 exhibited its nodulation vigour in soil, vermiculite, sand and growth pouches. la shows a root system of mutant ntsl007 grown to maturity in soil. l b shows a supernodulation response in nitrate rich, volcanic black soil 23 inoculated with Rhizobium strain USDAIIO. Both figures illUStrate that supernodulation occurs in soil conditions. Nitrogen content of such root systems is increased in comparison to wild type roots demonstrating that the additionally fixed nitrogen may have beneficial carry-over effects to the subsequent crop.

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