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A temperature-sensitive nodulation mutant (sym 5) of Pisum sativum L.
Authors:J. C. FEARN  T. A. LaRUE
Affiliation:Boyce Thompson Institute for Plant Research, Ithaca, New York 14853–1801, U.S.A.
Abstract:Abstract. In peas ( Pisum sativum L.) homozygous for sym 5, nodulation has an unusual temperature dependence. These sym 5 mutants nodulate poorly at a root temperature of 20°C but nodulate better at 12°C. By lowering the root temperature of the sym 5 mutants from a lightroom temperature of 20/15°C to a constant 12°C, 8d after planting, the number of nodules can be further increased. A cool period (12°C) as short as 6h, early in the infection process, is sufficient to significantly increase nodulation of plants otherwise growing at 20/15°C. This temperature-sensitivity of nodulation is not due to a temperature induced change of a sym 5-related, 66-kD peptide but may involve accumulation of a gas in the rhizosphere.
Keywords:Pisum sativum (L.)    Leguminosae    pea    nodulation    temperature-sensitivity    sym genes
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