Hormonal relations of radiation-induced tumors of Arabidopsis thaliana
- Case Western Reserve Univ., Cleveland, OH (USA)
When gamma-irradiated Arabidopsis seed was germinated, tumors appeared on hypocotyls and apical meristems of the resulting plants. Several tumors have been cultured on hormone free medium for over two years since excision from the plants. The tumor lines display a range of phenotypes suggestive of abnormal hormone balance. To determine whether hormone overproduction or hypersensitivity is involved in tumorigenesis, we are measuring hormone levels in the tumor lines and characterizing their response to exogenously supplied growth regulators. Growth of two tumor lines is stimulated by either NAA or BAP, one is stimulated by NAA only, two by BAP only, and one is stimulated by neither. Growth of all lines tested thus far is inhibited by gibberellic acid, ethephon and ACC. The tumor lines appear more sensitive to ACC than normal callus tissue. Most tumors studied to date appear unlikely to have arisen due to increased hormone sensitivity. Experiments are in progress to determine auxin and cytokinin levels in the tumor lines.
- OSTI ID:
- 6644905
- Journal Information:
- Plant Physiology, Supplement; (USA), Vol. 89:4; ISSN 0079-2241
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
HERBS
NEOPLASMS
RADIOINDUCTION
AUXINS
GAMMA RADIATION
GIBBERELLIC ACID
KININS
MERISTEMS
PHENOTYPE
BODY
CARBOXYLIC ACIDS
DISEASES
ELECTROMAGNETIC RADIATION
ESTERS
HETEROCYCLIC COMPOUNDS
HYDROXY ACIDS
IONIZING RADIATIONS
LACTONES
ORGANIC ACIDS
ORGANIC COMPOUNDS
PEPTIDES
PLANT GROWTH REGULATORS
PLANT TISSUES
PLANTS
POLYPEPTIDES
PROTEINS
RADIATIONS
TISSUES
560140* - Radiation Effects on Plants