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The Effect of Gamma‐Irradiation on Lettuce Seedling Elongation
Author(s) -
YEALY LYNN P.,
STONE BENJAMIN P.
Publication year - 1976
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.1399-3054.1976.tb04860.x
Subject(s) - hypocotyl , gibberellic acid , elongation , seedling , rna , biology , irradiation , ribosomal rna , botany , biochemistry , germination , physics , materials science , nuclear physics , metallurgy , ultimate tensile strength , gene
This study was initiated to determine the effects of gamma‐irradiation on lettuce hypocotyl elongation and ribosomal RNA synthesis relative to gibberellic acid and 5‐fluorouracil treatment. Exposure of seeds to gamma‐irradiation inhibited hypocotyl elongation of seedlings grown in continuous light and darkness. The presence of 5‐fluorouracil in the incubation medium significantly retarded hypocotyl elongation; however, gibberellic acid was stimulatory to elongation in seedlings grown from irradiated and un‐irradiated seeds. The synthesis of ribosomal RNA was selectively depressed by 5‐fluorouracil while gibberellic acid stimulated incorporation of 3 H‐uridine into ribosomal and transfer RNA. The observed response implies that ionizing radiation is effective in decreasing the synthesis of ribosomal and transfer RNA which is correlated with lettuce hypocotyl elongation.