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Changes in Endogenous Cytokinins of Lettuce Seed during Germination
Author(s) -
STADEN J.
Publication year - 1973
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.1399-3054.1973.tb01179.x
Subject(s) - lactuca , radicle , gibberellic acid , cytokinin , germination , phytochrome , kinetin , bioassay , botany , callus , gibberellin , biology , chemistry , horticulture , red light , biochemistry , auxin , explant culture , genetics , in vitro , gene
Using the soybean callus bioassay it has been shown that dormant lettuce seeds ( Lactuca sativa L. cv. Grand Rapids) contain large amounts of water soluble cytokinins and small amounts of butanol soluble ones. When the seeds are irradiated with red light, or imbibed with 5 mg/1 gibberellic acid in the dark, the total cytokinin content of the seeds decreases, the level of water soluble cytokinins decreases, and the level of the butanol soluble cytokinins increases. Far‐red light does not reverse this effect completely although cytokinin activity in the butanol extracts decreases following such irradiation. It is proposed that the interconversion of cytokinins initiated by red light, or gibberellic acid in the dark, is one of the primary events leading to radicle elongation in light‐sensitive lettuce seed.