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Effects of incandescent radiation on photosynthesis, growth rate and yield of 'Waldmann's Green' leaf lettuce.
Sci Hortic (Amsterdam) 1989; 35:37-49SH

Abstract

Effects of different ratios incandescent (ln) to fluorescent (Fl) radiation were tested on growth of 'Waldmann's Green' leaf lettuce (Lactuca sativa L.) in a controlled environment. After 4 days of treatment, dry weight, leaf area, relative growth rate (RGR), net assimilation rate (NAR), leaf area ratio (LAR) and photosynthetic rate (Pn) were greater for plants grown at 84 rather than 16% of total irradiance (82 W m-2) from ln lamps. Although leaf dry weight and area were 12-17% greater at 84% ln after the first 8 days of treatment, there were no differences in RGR or Pn between treatments during the last 4 days. If 84% ln was compared with 50% ln, all cumulative growth parameters, RGR, NAR and Pn were greater for 84% ln during the first 4 days of treatment. However, during the second 4 days, RGR was greater for the 50% ln treatment, resulting in no net difference in leaf dry weight or area between treatments. Shifting from 84 to 50% ln radiation between the first and second 4 days of treatment increased plant dry weight, leaf area, RGR and NAR relative to those under 84% ln for 8 days continuously.

Authors+Show Affiliations

Department of Horticulture, Purdue University, West Lafayette, IN 47907, USA.No affiliation info available

Pub Type(s)

Journal Article
Research Support, U.S. Gov't, Non-P.H.S.
Research Support, U.S. Gov't, P.H.S.

Language

eng

PubMed ID

11539045

Citation

Knight, S L., and C A. Mitchell. "Effects of Incandescent Radiation On Photosynthesis, Growth Rate and Yield of 'Waldmann's Green' Leaf Lettuce." Scientia Horticulturae, vol. 35, 1989, pp. 37-49.
Knight SL, Mitchell CA. Effects of incandescent radiation on photosynthesis, growth rate and yield of 'Waldmann's Green' leaf lettuce. Sci Hortic. 1989;35:37-49.
Knight, S. L., & Mitchell, C. A. (1989). Effects of incandescent radiation on photosynthesis, growth rate and yield of 'Waldmann's Green' leaf lettuce. Scientia Horticulturae, 35, pp. 37-49.
Knight SL, Mitchell CA. Effects of Incandescent Radiation On Photosynthesis, Growth Rate and Yield of 'Waldmann's Green' Leaf Lettuce. Sci Hortic. 1989;35:37-49. PubMed PMID: 11539045.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Effects of incandescent radiation on photosynthesis, growth rate and yield of 'Waldmann's Green' leaf lettuce. AU - Knight,S L, AU - Mitchell,C A, PY - 1989/1/1/pubmed PY - 2001/9/11/medline PY - 1989/1/1/entrez KW - NASA Discipline Life Support Systems KW - NASA Discipline Number 61-10 KW - NASA Program CELSS KW - Non-NASA Center SP - 37 EP - 49 JF - Scientia horticulturae JO - Sci. Hortic. VL - 35 N2 - Effects of different ratios incandescent (ln) to fluorescent (Fl) radiation were tested on growth of 'Waldmann's Green' leaf lettuce (Lactuca sativa L.) in a controlled environment. After 4 days of treatment, dry weight, leaf area, relative growth rate (RGR), net assimilation rate (NAR), leaf area ratio (LAR) and photosynthetic rate (Pn) were greater for plants grown at 84 rather than 16% of total irradiance (82 W m-2) from ln lamps. Although leaf dry weight and area were 12-17% greater at 84% ln after the first 8 days of treatment, there were no differences in RGR or Pn between treatments during the last 4 days. If 84% ln was compared with 50% ln, all cumulative growth parameters, RGR, NAR and Pn were greater for 84% ln during the first 4 days of treatment. However, during the second 4 days, RGR was greater for the 50% ln treatment, resulting in no net difference in leaf dry weight or area between treatments. Shifting from 84 to 50% ln radiation between the first and second 4 days of treatment increased plant dry weight, leaf area, RGR and NAR relative to those under 84% ln for 8 days continuously. SN - 0304-4238 UR - https://www.unboundmedicine.com/medline/citation/11539045/Effects_of_incandescent_radiation_on_photosynthesis_growth_rate_and_yield_of_'Waldmann's_Green'_leaf_lettuce_ DB - PRIME DP - Unbound Medicine ER -