NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Tomato growth as affected by root-zone temperature and the addition of gibberellic acid and kinetin to nutrient solutionsThe effect of root-zone temperature on young tomato plants (Lycopersicon esculentum Mill. cv. Heinz 1350) was evaluated in controlled environments using a recirculating solution culture system. Growth rates were measured at root-zone temperatures of 15 degrees, 20 degrees, 25 degrees, and 30 degrees C in a near optimum foliar environment. Optimum growth occurred at 25 degrees to 30 degrees during the first 4 weeks of growth and 20 degrees to 25 degrees during the 5th and 6th weeks. Growth was severely restricted at 15 degrees. Four concentrations of gibberellic acid (GA3) and kinetin were added to the nutrient solution in a separate trial; root-zone temperature was maintained at 15 degrees and 25 degrees. Addition of 15 micromoles GA3 to solutions increased specific leaf area, total leaf area, and dry weight production of plants in both temperature treatments. GA3-induced growth stimulation was greater at 15 degrees than at 25 degrees. GA3 may promote growth by increasing leaf area, enhancing photosynthesis per unit leaf area, or both. Kinetic was not useful in promoting growth at either temperature.
Document ID
20040089583
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Bugbee, B.
(University Park 16802 United States)
White, J. W.
Salisbury, F. B.
Date Acquired
August 21, 2013
Publication Date
January 1, 1984
Publication Information
Publication: Journal of the American Society for Horticultural Science. American Society for Horticultural Science
Volume: 109
Issue: 1
ISSN: 0003-1062
Subject Category
Man/System Technology And Life Support
Distribution Limits
Public
Copyright
Other
Keywords
NASA Program CELSS
NASA Discipline Life Support Systems
NASA Discipline Number 60-40
Non-NASA Center

Available Downloads

There are no available downloads for this record.
No Preview Available