Clinorotation affects morphology and ethylene production in soybean [Glycine max] seedlings

• Published in: Plant and cell physiology Vol. 37; no. 7; pp. 929 - 934
• Main Authors: Hilaire, E. (Dynamac Corp. (USA)), Peterson, B.V, Guikema, J.A, Brown, C.S
• Format: Journal Article
• Language: English
• Published: Kennedy Space Center Oxford University Press 01-10-1996
• Subjects: 2,4-Dichlorophenoxyacetic Acid - pharmacology; Agronomy. Soil science and plant productions; ANATOMIA DE LA PLANTA; ANATOMIE VEGETALE; Auxin; auxins; Biological and medical sciences; biomass production; biosynthesis; Carbon Dioxide - metabolism; Clinostat; dose response; Economic plant physiology; Ethylene; ETHYLENE PRODUCTION; Ethylenes - antagonists & inhibitors; Ethylenes - biosynthesis; etiolation; Fundamental and applied biological sciences. Psychology; GLYCINE MAX; Glycine max - anatomy & histology; Glycine max - drug effects; Glycine max - growth & development; Glycine max - metabolism; Glycine max L; Gravitation; Gravity; Growth and development; Herbicides - pharmacology; Indoleacetic Acids - antagonists & inhibitors; Indoleacetic Acids - metabolism; Life Sciences (General); Morphogenesis, differentiation, rhizogenesis, tuberization. Senescence; Partitioning; Physical agents; PLANT ANATOMY; PLANT CONTAINERS; Plant Growth Regulators - biosynthesis; Plant Growth Regulators - pharmacology; plant morphology; Plant physiology and development; PLANT RESPONSE; Plant Roots - anatomy & histology; Plant Roots - drug effects; Plant Roots - growth & development; Plant Roots - metabolism; Plant Shoots - anatomy & histology; Plant Shoots - drug effects; Plant Shoots - growth & development; Plant Shoots - metabolism; PLANTULAS; PLANTULE; PRODUCCION DE ETILENO; PRODUCTION D'ETHYLENE; RECIPIENT DE CULTURE; RECIPIENTE DE CULTIVO; regulation; REPONSE DE LA PLANTE; RESPUESTA DE LA PLANTA; ROLLING; roots; rotation; Rotation - adverse effects; ROULAGE; RULADO; seedling growth; SEEDLINGS; shoots; translocation (plant physiology); Triiodobenzoic Acids - pharmacology; Vegetative apparatus, growth and morphogenesis. Senescence; Weightlessness Simulation; zero gravity; Nasa Center Ksc; Nasa Discipline Life Support Systems; Auxin; Growth; Ethylene; Biosynthesis; Growth regulator treatment; Glycine max; Grain legume; Leguminosae; Dicotyledones; Morphology; Angiospermae; Plant growth substance; Spermatophyta; Microgravity; NASA Center KSC; NASA Discipline Life Support Systems
• ISSN: 0032-0781; 1471-9053
• DOI: 10.1093/oxfordjournals.pcp.a029041

The microgravity environment of spaceflight influence growth, morphology and metabolism in etiolated germinating soybean. To determine if clinorotation will similarly impact these processes, we conducted ground-based studies in conjunction with two space experiment opportunities. Soybean seeds were planted within BRIC (Biological Research In Canister) canisters and grown for seven days at 20 degrees C under clinorotation (1 rpm) conditions or in a stationary upright mode. Gas samples were taken daily and plants were harvested after seven days for measurement of growth and morphology. Compared to the stationary upright controls, plants exposed to clinorotation exhibited increased root length and fresh weight, whereas shoot length and fresh weight decreased by 33% and 16% respectively. Plants grown under clinorotation produced twice as much ethylene as the stationary controls. Seedlings treated with triiodo benzoic acid (TIBA), an auxin tranport inhibitor, under clinorotation produced 50% less ethylene than the untreated control subjected to the same gravity treatment, whereas a treatment with 2,4-D increased ethylene by five-fold in the clinorotated plants. These data suggest that slow clinorotation influences biomass partitioning and ethylene production in etiolated soybean plants