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Physiological and biochemical changes associated with cotton fibre development. II. Auxin oxidising system
Author(s) -
Rao N. Rama,
Naithani S. C.,
Singh Y. D.
Publication year - 1982
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1982.tb02288.x
Subject(s) - elongation , peroxidase , cultivar , auxin , thickening , malvaceae , horticulture , oxidase test , botany , chemistry , biology , enzyme , biochemistry , ultimate tensile strength , gene , materials science , polymer science , metallurgy
Changes in IAA oxidase, and in cytoplasmic and ionically wall‐bound peroxidase activities were studied in the developing fibres of three cotton cultivars ( Gossypium hirsutum L. cv. Gujarat‐67, cv. Khandwa‐2 and G. herbaceum L. cv. Digvijay), designated as long, medium and short staple cultivars, respectively. In all the three cultivars IAA oxidase activity was low during the fibre elongation phase, while the activity increased significantly during the secondary thickening phase. The increase in IAA oxidase activity in the three cultivars showed close correspondence with their respective total period of elongation. No relationship between cytoplasmic peroxidase activity and fibre development was discernible. The ionically bound wall peroxidase activity, however, recorded low levels during the elongation phase and higher levels during the secondary thickening phase. The role of wall peroxidase in cessation of elongation growth is discussed.