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A temperature‐sensitive nodulation mutant ( sym 5) of Pisum sativum L.
Author(s) -
FEARN J. C.,
LaRUE T. A.
Publication year - 1991
Publication title -
plant, cell and environment
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.646
H-Index - 200
eISSN - 1365-3040
pISSN - 0140-7791
DOI - 10.1111/j.1365-3040.1991.tb01339.x
Subject(s) - pisum , sativum , mutant , rhizosphere , horticulture , biology , botany , biochemistry , bacteria , genetics , gene
. 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.