Thermoinductive regulation of gibberellin metabolism in Thlaspi arvense L

Journal Article · Sat Sep 01 00:00:00 EDT 1990 · Plant Physiology; (USA)

DOI:https://doi.org/10.1104/pp.94.1.157· OSTI ID:5962131

Hazebroek, J P; Metzger, J D ^[1]

---

1. Department of Agriculture, Fargo, ND (USA)

Field pennycress (Thlaspi arvense L.) is a winter annual crucifer with a cold requirement for stem elongation and flowering. In the present study, the metabolism of exogenous ({sup 2}H)-ent-kaurenoic acid (KA) and ({sup 14}C)-gibberellin A{sub 12}-aldehyde (GA{sub 12}-aldehyde) was compared in thermo- and noninduced plants. Thermoinduction greatly altered both quantitative and qualitative aspects of ({sup 2}H)-KA metabolism in the shoot tips. The rate of disappearance of the parent compound was much greater in thermoinduced shoot tips. These results are consistent with the suggestion that the conversion of KA in to GAs is under thermoinductive control only in the shoot tip, the site of perception for thermoinductive temperatures in field pennycress. There were essentially no differences in the qualitative or quantitative distribution of metabolites formed following the application of ({sup 14}C)GA{sub 12}-aldehyde to the shoot tips of thermo- or noninduced plants. Thus, the apparent thermoinductive regulation of the KA metabolism into GAs is probably limited to the two metabolic steps involved in converting KA to GA{sub 12}-aldehyde.

• OSTI ID: 5962131
• Journal Information: Plant Physiology; (USA), Vol. 94:1; ISSN 0032-0889
• Country of Publication: United States
• Language: English

Related Subjects

59 BASIC BIOLOGICAL SCIENCES
GIBBERELLIC ACID
METABOLISM
TEMPERATURE EFFECTS
CARBON 14 COMPOUNDS
DEUTERIUM
HYDROGEN COMPOUNDS
PLANT GROWTH
TRACER TECHNIQUES
CARBOXYLIC ACIDS
ESTERS
GROWTH
HETEROCYCLIC COMPOUNDS
HYDROGEN ISOTOPES
HYDROXY ACIDS
ISOTOPE APPLICATIONS
ISOTOPES
LABELLED COMPOUNDS
LACTONES
LIGHT NUCLEI
NUCLEI
ODD-ODD NUCLEI
ORGANIC ACIDS
ORGANIC COMPOUNDS
STABLE ISOTOPES
550201* - Biochemistry- Tracer Techniques