Seed germination characteristics of Chrysothamnus nauseosus ssp. viridulus (Astereae, Asteraceae)
Rubber rabbitbrush (Chrysothamnus nauseosus (Pallas) Britt. ssp. viridulus) may prove to be a source of high-quality cis-isoprene rubber, but its establishment is limited by a lack of information on seed germination. Consequently, seeds were germinated at alternating temperatures (5-15, 5-25, 15-25, and 20-30 C) in light and dark as well as constant temperatures (15-40 C with 5-C increments) to determine temperature response. Seeds were also germinated in solutions of polyethylene glycol 6000, salinity regimes at all the above-mentioned temperatures to determine salinity and temperature interaction. The hormones GA/sub 3/ and kinetin were used to study their effect on overcoming salt- and temperature-induced germination inhibition. Seeds of C. nauseosus ssp. viridulus were very sensitive to low temperature. Best germination was achieved at 25 and 30 C, but these seeds also germinated at a higher temperature (35 C). The seeds of rabbit brush germinated at both constant and alternating temperatures. Light appears to play little or no role in controlling germination of the seeds of rubber rabbitbrush. However, seeds of rabbitbrush were sensitive to salinity, and seed germination was progressively inhibited by increase in salt concentration, although a few seeds still germinated at the highest saline level. Progressively higher concentrations of polyethylene glycol also progressively inhibited germination. Suppression of seed germination induced by high salt concentrations and high temperatures can be partially alleviated by the application of either GA/sub 3/ or kinetin. 34 references, 5 figures, 3 tables.
- Research Organization:
- Univ. of Karachi (Pakistan)
- OSTI ID:
- 5025521
- Journal Information:
- Great Basin Nat.; (United States), Vol. 47:2
- Country of Publication:
- United States
- Language:
- English
Similar Records
Uptake of strontium by chamisa (Chrysothamnus nauseosus) shrub plants growing over a former liquid waste disposal site at Los Alamos National Laboratory
Selected biological parameters associated with a +-400-kV d-c transmission line in Oregon
Related Subjects
HORMONES
BIOLOGICAL FUNCTIONS
NATURAL RUBBER
YIELDS
SEEDS
GERMINATION
TEMPERATURE EFFECTS
EXPERIMENTAL DATA
INHIBITION
SALINITY
SHRUBS
VISIBLE RADIATION
DATA
ELASTOMERS
ELECTROMAGNETIC RADIATION
FUNCTIONS
INFORMATION
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC POLYMERS
PLANTS
POLYMERS
RADIATIONS
RUBBERS
140504* - Solar Energy Conversion- Biomass Production & Conversion- (-1989)