DAILY PERIODICITY IN THE TRANSPORT OF ORGANIC PLANT SUBSTANCES

Journal Article · Sun Oct 21 04:00:00 EDT 1962 · Doklady Akad. Nauk SSSR

OSTI ID:4755358

Anisimov, A A; Fuzina, E K; Dobryakova, L A; Likhovidova, E V

Corn, sunflower, potato, and cucumber plants 30 to 40 days old were exposed for one hour to a 3% CO/sub 2/ atmosphere containing 50 mu C of C/sup 14/ per liter of gas. Then, the plants were maintained 4 to 8 hours under natural illumination for various periods of the day (from 10 to 14 o'clock, from 14 to 18 o'clock, and from 22 to 6 o'clock in the morning). The roots, stems, and leaves were then separated and counted on an end-window counter. The relative transport rate was estimated from the percentage activity in the root or stem. The decrease in activity per unit surface area per hour was also determined, and a correction was made for the respiratory loss. Movement of organic matter from the leaves to other parts of the plant takes place during all periods of the day. The most active transport was noted in the corn seedlings, and the least active in the potato seedlings. The sunflower was similar to the corn plants in behavior, while the cucumber was closer to the potato. In two of the plants (potato and sunflower), the transport of organic substances from the leaves increased during the night hours. The transport rate rose, but did not attain its maximum during the night hours in the potato plant. The movement of organic matter to the roots was greatest during the night hours in all experiments. (TTT)

• Research Organization: Gor'kovskii State Univ., USSR
• NSA Number: NSA-17-005756
• OSTI ID: 4755358
• Journal Information: Doklady Akad. Nauk SSSR, Journal Name: Doklady Akad. Nauk SSSR Vol. Vol: 146
• Country of Publication: Country unknown/Code not available
• Language: Russian

Related Subjects

BIOLOGY AND MEDICINE
CARBON 14
CARBON DIOXIDE
CEREALS
CORN
COUNTERS
CUCUMBERS
GASES
LIGHT
METABOLISM
OXIDATION
PLANTS
POTATOES
REDUCTION
ROOTS
SUNFLOWERS