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CHARACTERIZATION OF VEGETATIVE GROWTH OF DWARF SOYBEAN GENOTYPES INCLUDING A GIBBERELLIN‐INSENSITIVE GENOTYPE WITH IMPAIRED CELL DIVISION
Author(s) -
Birnberg Paul R.,
Cordero Robert E.,
Brenner Mark L.
Publication year - 1987
Publication title -
american journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.218
H-Index - 151
eISSN - 1537-2197
pISSN - 0002-9122
DOI - 10.1002/j.1537-2197.1987.tb08690.x
Subject(s) - gibberellin , biology , shoot , genotype , dwarfism , cultivar , dwarfing , glycine , cell division , elongation , horticulture , botany , vegetative reproduction , cell , genetics , gene , rootstock , ultimate tensile strength , metallurgy , materials science , amino acid
The response of normal soybean ( Glycine max [L.] Merrill) cultivars to gibberellins (GAs) and to an inhibitor of GA biosynthesis indicated that, as in other species, endogenous GAs are involved in controlling internode length. The responses to GA of several pairs of isogenic dwarf and normal genotypes (isolines) were compared. Dwarf genotypes T209, T244, T256, and M64–503‐Duddy apparently are not dwarfed by lesions in the biosynthetic pathway similar to the well‐studied mutations in pea and corn. Although these genotypes responded to GA 3 , their growth as a percentage of initial shoot length was less than that of the normal isolines following GA 3 treatment. Dwarf genotype T210 responded to GA 3 treatment with a much smaller increase in stature than the other dwarf genotypes. Roots of T210 seedlings were of normal size, which indicated that the mutation in T210 primarily affects shoot growth. Transport and metabolism of GA 3 were equivalent in T210 and its non‐dwarf isoline, Lincoln. The slight response in shoot length of T210 to GA 3 was accounted for by cell elongation, which GA 3 promoted to at least the same extent as in Lincoln. Gibberellin A 3 had no effect on cell number in T210, although GA 3 increased cell number in Lincoln by 53%. Thus, T210 is dwarfed by an inability to carry out GA‐promoted cell division.