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PROMOTION OF PLASTID PIGMENT ACCUMULATION IN WATER STRESSED WHEAT LEAF SECTIONS BY HORMONE TREATMENT
Author(s) -
Duysen M. E.,
Freeman T. P.
Publication year - 1976
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.1537-2197.1976.tb13198.x
Subject(s) - carotenoid , biology , pigment , abscisic acid , plastid , chlorophyll , botany , photosynthetic pigment , gibberellic acid , chlorophyll a , chloroplast , photosynthesis , horticulture , biochemistry , chemistry , germination , organic chemistry , gene
Chlorophyll (Chl) and carotenoid accumulations are markedly reduced in detached wheat leaves after 20‐hr exposure to light when subjected to mild (‐7 bar) osmotic stress prior to illumination. The treatment of N 6 ‐benzyladenine (BA) in combination with gibberellic acid (GA) stimulated the recovery of plastid pigment accumulations in mildy stressed detached leaves. The combination treatment of BA plus IAA increased pigment accumulations only to the level stimulated by BA treatment alone. Mild water deficits increased the Chl a/b ratio and reduced the Chl/carotenoid ratio in wheat sections. Growth promoting hormones generally lowered the Chl a/b ratio and increased the Chl/carotenoid ratio in mildly stressed detached leaves. Abscisic acid (ABA) reduced plastid pigment concentrations in greening tissue and increased the Chl a/b ratio while decreasing the Chl/carotenoid ratio. In detached leaves stressed to ‐14 bars, BA in combination with GA stimulated only partial recovery of the plastid pigment accumulations and improved slightly the Chl a/b and Chl/carotenoid ratios.