THE BIOSYNTHESIS OF CHLOROPHYLL IN RESERVE DEPOTS OF PLANTS IN CONNECTION WITH THE ACTION OF IONIZING RADIATION

Journal Article · Sat Apr 01 04:00:00 EST 1961 · Doklady Akad. Nauk S.S.S.R.

OSTI ID:4008484

Mukhin, E N; Sal'kova, E G

Potato tubers irradiated with a gamma dose of 10,000 r or higher lose their ability to form chlorophyll. The chsnges in various oxidation-reduction enzymes were followed in normal potatoes and in potatoes irradiated with doses of 10,000 and 150,000 r. It was observed that the activity of peroxidase in the control potatoes rose to a higher level than in the irradiated potatoes, when exposed to light. Neither irradiation nor exposure of the tuber to light caused an increase in the activity of polyphenol oxidase. Glycolic acid oxidase increases in activity on exposure of the tuber to light, but no change in activity was noted even on irradiating the tuber with a dose of 150,000 r. Hence, the activation of this oxidase may proceed independently of the presence of chlorophyll. The dehydrogenases are more active in the irradiated potato than in the control. Since the level of oxidative enzymes in the irradiated potato is about that of the control while the synthesis of chlorophyll is slowed down by radiation, it is assumed that there is a disruption between the oxidative processes and phosphorylation. The results of a special experiment show that the activity of hexosephosphatase is suppressed in the irradiated potato as compared to the control. The processes of oxidation and phosphorylation are both required for the synthesis of chlorophyll. (TTT)

• Research Organization: Bakh Inst. of Biochemistry, Academy of Sciences, USSR
• NSA Number: NSA-15-019170
• OSTI ID: 4008484
• Journal Information: Doklady Akad. Nauk S.S.S.R., Journal Name: Doklady Akad. Nauk S.S.S.R. Vol. Vol: 137
• Country of Publication: Country unknown/Code not available
• Language: Russian

Related Subjects

BIOLOGY AND MEDICINE
BIOSYNTHESIS
CHLOROPHYLL
ENZYMES
GAMMA RADIATION
OXYGEN
PLANTS
RADIATION EFFECTS