Turnover of dhurrin in green sorghum seedlings. [Sorghum bicolor]
Journal Article
·
· Plant Physiology; (USA)
- Obafemi Awolowo Univ., Ile-Ife (Nigeria)
The turnover of dhurrin in green seedlings of Sorghum bicolor (Linn) Moench var Redland x Greenleaf, Sudan 70 has been investigated using glyphosate and pulse-labeling studies with {sup 14}C-tyrosine and ({sup 14}C)shikimic acid. The rate of dhurrin breakdown was 4.8 nanomoles per hour in the shoot and 1.4 nanomoles per hour in the root. The rate of dhurrin accumulation in the shoot of 4- to 5-day-old seedlings was high but decreased with age until at the peak period of dhurrin accumulation, the rates of dhurrin synthesis and breakdown were equal. Using a first order equation (an approximation) the rate of dhurrin synthesis (which equals accumulation plus breakdown rates) was 17.4 nanomoles per hour in the shoot and 4.1 nanomoles per hour in the root. In both tissues, the breakdown rate was between 27 and 34% of their synthetic capacity within the experimental period. Dhurrin synthesis in green sorghum seedlings occurred in both the light and dark photoperiods but was faster in the dark period. The result is discussed in relation to the possible metabolic roles of the turnover.
- OSTI ID:
- 5726078
- Journal Information:
- Plant Physiology; (USA), Journal Name: Plant Physiology; (USA) Vol. 94:3; ISSN 0032-0889; ISSN PLPHA
- Country of Publication:
- United States
- Language:
- English
Similar Records
Regulation of dhurrin pathway gene expression during Sorghum bicolor development
Uptake and phytotoxicity of the herbicide metsulfuron methyl in corn root tissue in the presence of the safener 1,8-naphthalic anhydride. [Zea mays L]
The biosynthesis of cyanogenic glucosides in higher plants. Identification of three hydroxylation steps in the biosynthesis of dhurrin in Sorghum bicolor (L. ) Moench and the involvement of 1-ACI-nitro-2-(p-hydroxyphenyl)ethane as an intermediate
Journal Article
·
Wed Nov 10 19:00:00 EST 2021
· Planta
·
OSTI ID:1846171
Uptake and phytotoxicity of the herbicide metsulfuron methyl in corn root tissue in the presence of the safener 1,8-naphthalic anhydride. [Zea mays L]
Journal Article
·
Fri Jun 01 00:00:00 EDT 1990
· Plant Physiology; (USA)
·
OSTI ID:5957305
The biosynthesis of cyanogenic glucosides in higher plants. Identification of three hydroxylation steps in the biosynthesis of dhurrin in Sorghum bicolor (L. ) Moench and the involvement of 1-ACI-nitro-2-(p-hydroxyphenyl)ethane as an intermediate
Journal Article
·
Tue Dec 04 23:00:00 EST 1990
· Journal of Biological Chemistry; (USA)
·
OSTI ID:6072530
Related Subjects
550201* -- Biochemistry-- Tracer Techniques
59 BASIC BIOLOGICAL SCIENCES
AMINO ACIDS
BIOCHEMICAL REACTION KINETICS
CARBOHYDRATES
CARBON 14 COMPOUNDS
CARBONIC ACID DERIVATIVES
CARBOXYLIC ACIDS
CEREALS
CYANATES
GLYCOSIDES
GRAMINEAE
HYDROXY ACIDS
ISOTOPE APPLICATIONS
KINETICS
LABELLED COMPOUNDS
LILIOPSIDA
MAGNOLIOPHYTA
NITROGEN COMPOUNDS
ORGANIC ACIDS
ORGANIC COMPOUNDS
PHYSIOLOGY
PLANTS
REACTION KINETICS
SEEDLINGS
SHIKIMIC ACID
SORGHUM
TRACER TECHNIQUES
TYROSINE
59 BASIC BIOLOGICAL SCIENCES
AMINO ACIDS
BIOCHEMICAL REACTION KINETICS
CARBOHYDRATES
CARBON 14 COMPOUNDS
CARBONIC ACID DERIVATIVES
CARBOXYLIC ACIDS
CEREALS
CYANATES
GLYCOSIDES
GRAMINEAE
HYDROXY ACIDS
ISOTOPE APPLICATIONS
KINETICS
LABELLED COMPOUNDS
LILIOPSIDA
MAGNOLIOPHYTA
NITROGEN COMPOUNDS
ORGANIC ACIDS
ORGANIC COMPOUNDS
PHYSIOLOGY
PLANTS
REACTION KINETICS
SEEDLINGS
SHIKIMIC ACID
SORGHUM
TRACER TECHNIQUES
TYROSINE