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Effect of 2,4‐D on Cell Wall Metabolism of Peroxyacetyl Nitrate Pretreated Avena Coleoptile Sections
Author(s) -
Ordin Lawrence,
Garber Morris J.,
Kindinger Juanita I.
Publication year - 1970
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.1399-3054.1970.tb06398.x
Subject(s) - coleoptile , avena , cell wall , metabolism , auxin , chemistry , polysaccharide , cellulose , biochemistry , growth inhibition , cell growth , incubation , botany , biology , gene
Avena coleoptile sections were exposed to nonlethal concentrations of peroxyacetyl nitrate (PAN). The sections were then incubated in solutions of 50 m M glucose plus 2.5 m M poassium phosphate with various concentrations of 2,4‐dichlorophenoxycetic acid (2,4‐D). Growth after 4 hours was measured. A corresponding series of experiments was carried out with glucose‐ 14 C (U) in the subsequent incubation medium and the effect of the 2,4‐D treatments on 14 C incorporation into various cell wall components was determined. Growth in the PAN‐treated sections, although still partially inhibited, was greater at auxin levels normally superoptimal for growth than at the former optimum. Incorporation into all cell wall fractions was similar to growth in the case of control treated tissue. Most of the cell wall constituents, but particularly cellulose and less soluble noncellulosic polysaccharides, tended to show higher incorporation at the levels where PAN‐treated growth was also higher. It was concluded that effects by PAN on cell wall metabolism in growing tissue are similar to the effects on growth and that the mechanism of alleviation of growth inhibition is probably through decreased inhibition of wall metabolism.