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• W2035953586 abstract "ABSTRACT In the case of ideal behavior of nodulation mutants under field conditions, the impact of nitrogen fixation on plant growth can be easily determined by subtracting the yield of a mutant from the yield of the original cultivar forming wild-type symbiotic nodules. Therefore, four symbiotic mutants of pea (Pisum sativum L.) cv. Finale termed Risnod2, Risnod27, RisfixO, and RisfixM were tested as reference lines for the field assessment of the contribution of biological nitrogen fixation to seed yield. In 1996 and 1997 field trials, the stable non-nodulation of Risnod2 and Risnod27 was confirmed, as well as the ineffectiveness of RisfixO nodules. Phenotype of RisfixM was found to be unstable since this mutant, previously classified as ineffectively nodulating under controlled conditions, possessed residual nitrogenase activity under field conditions. Growth and yield of Risnod27 and RisfixM on non-limiting (saturating) level of mineral nitrogen in soil were indistinguishable from the wild-type plants. This equivalency indicates absence of deleterious pleiotropic effects of the main mutation or the effect of multiple mutations that might adversely influence nitrogen metabolism or plant development. This result was independent of the level of organic matter in the soil. On the other hand, Risnod2 and RisfixO do not seem to be physiologically equivalent to the wild-type plants, as judged by their fairly weak response to mineral nitrogen. For this reason, both the latter mutants are not considered as suitable for reference lines. An additional reason for the exclusion of Risnod2 and RisfixM was lower field emergence rate. Neither differential susceptibility to Fusarium infection under natural infectious background nor obvious susceptibility to other pathogens was observed in all the tested lines. It is concluded that the non-nodulating mutant Risnod27, paired with its parent cultivar Finale, may serve as a reference line in routine field estimates of the contribution of symbiotic nitrogen fixation to pea yield. Under the experimental plot conditions (České Budějovice in the Czech Republic, Orthic Luvisol with 13.9 mg NO3 −, and 4.4 mg NH4 + per kg dry soil), the benefit from N2 fixation varied from 34 to 66% of the value of individual wild-type yield characteristics." @default.
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• W2035953586 date "2002-09-03" @default.
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• W2035953586 title "PEA MUTANT RISNOD27 AS REFERENCE LINE FOR FIELD ASSESSMENT OF IMPACT OF SYMBIOTIC NITROGEN FIXATION" @default.
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• W2035953586 doi "https://doi.org/10.1081/pln-120013294" @default.
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