Carbon fixed in leaves and twigs of field Larrea tridentata in two-hour exposure to /sup 14/CO/sub 2/
Six Larrea tridentata (Sesse and Moc. ex DC) Cov. plants were exposed to /sup 14/CO/sub 2/ in a field experiment for 2 h. Three of the plants had been irrigated regularly in the preceding year. Ten small twigs from each plant were removed and counted for /sup 14/C activity at the end of 2 h. The stem portion of the twigs was of equal dry weight for the two sets of plants, but those irrigated had a greater weight of leaves per twig. The activity of /sup 14/C in leaves was equal for the two groups, but was higher in stems for watered plants than for unwatered plants. The results were best expressed as ratios. Dry weight of leaves divided by dry weight of stems was high for watered plants; cpm/g dry weight of leaves divided by cpm/g dry weight of stems was higher for unwatered plants. In another experiment in which leaves were removed before exposing stem portions of twigs to /sup 14/CO/sub 2/, small green stems accounted for about 1/8 the total photosynthesis for a plant; the coefficient of variation was around 100%.
- Research Organization:
- Univ. of California, Los Angeles
- OSTI ID:
- 6870240
- Journal Information:
- Great Basin Nat.; (United States), Vol. 4
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
59 BASIC BIOLOGICAL SCIENCES
LEAVES
PHOTOSYNTHESIS
PLANT STEMS
CARBON 14
CARBON DIOXIDE
COMPARATIVE EVALUATIONS
DESERTS
EXPERIMENTAL DATA
SHRUBS
UPTAKE
ARID LANDS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CARBON COMPOUNDS
CARBON ISOTOPES
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
DATA
EVEN-EVEN NUCLEI
INFORMATION
ISOTOPES
LIGHT NUCLEI
NUCLEI
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PLANTS
RADIOISOTOPES
SYNTHESIS
YEARS LIVING RADIOISOTOPES
510100* - Environment
Terrestrial- Basic Studies- (-1989)
550500 - Metabolism