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Modification of yield and chlorophyll content in leaf lettuce by HPS radiation and nitrogen treatments.
HortScience 1991; 26(11):1371-4H

Abstract

This study evaluated the potential of high photosynthetic photon flux (PPF) from high-pressure sodium (HPS) lamps, alone or in combination with metal halide (MH) plus quartz iodide (QI) incandescent lamps, to support lettuce growth, with or without N supplementation. Varying exposures to radiation from combined HPS, MH, and QI lamps influenced dry weight gain and photosynthetic pigment content of hydroponically grown Black-Seeded Simpson' lettuce (Lactuca sativa L.) seedlings. Cumulative leaf dry weight declined with increasing exposure, up to 20 hours per day, to 660 micromoles m-2 s-1 of photosynthetically active radiation (PAR) from HPS lamps concomitant with constant 20 hours per day of 400 micromoles m-2 s-1 from MH + QI lamps. Leaves progressively yellowed with increasing exposure to radiation from the three-lamp combination, corresponding to lower specific chlorophyll content but not to specific carotenoid content. Lettuce grown under 20-hour photoperiods of 400, 473, or 668 micromoles m-2 s-1 from HPS radiation alone had the highest leaf dry weight at a PPF of 473 micromoles m-2 s-1. Chlorophyll, but not carotenoid specific content, decreased with each incremental increase in PPF from HPS lamps. Doubling the level of N in nutrient solution and supplying it as a combination of NH4+ and NO3- partially ameliorated adverse effects of high PPF on growth and pigment content relative to treatments using single-strength N as NO3-.

Authors+Show Affiliations

Center for Plant Environmental Stress Physiology, Department of Horticulture, Purdue University, West Lafayette, IN 47907.No affiliation info availableNo affiliation info available

Pub Type(s)

Comparative Study
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

11537726

Citation

Mitchell, C A., et al. "Modification of Yield and Chlorophyll Content in Leaf Lettuce By HPS Radiation and Nitrogen Treatments." HortScience : a Publication of the American Society for Horticultural Science, vol. 26, no. 11, 1991, pp. 1371-4.
Mitchell CA, Leakakos T, Ford TL. Modification of yield and chlorophyll content in leaf lettuce by HPS radiation and nitrogen treatments. HortScience. 1991;26(11):1371-4.
Mitchell, C. A., Leakakos, T., & Ford, T. L. (1991). Modification of yield and chlorophyll content in leaf lettuce by HPS radiation and nitrogen treatments. HortScience : a Publication of the American Society for Horticultural Science, 26(11), pp. 1371-4.
Mitchell CA, Leakakos T, Ford TL. Modification of Yield and Chlorophyll Content in Leaf Lettuce By HPS Radiation and Nitrogen Treatments. HortScience. 1991;26(11):1371-4. PubMed PMID: 11537726.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Modification of yield and chlorophyll content in leaf lettuce by HPS radiation and nitrogen treatments. AU - Mitchell,C A, AU - Leakakos,T, AU - Ford,T L, PY - 1991/11/1/pubmed PY - 2001/9/11/medline PY - 1991/11/1/entrez KW - NASA Discipline Life Support Systems KW - NASA Discipline Number 61-10 KW - NASA Program CELSS KW - Non-NASA Center SP - 1371 EP - 4 JF - HortScience : a publication of the American Society for Horticultural Science JO - HortScience VL - 26 IS - 11 N2 - This study evaluated the potential of high photosynthetic photon flux (PPF) from high-pressure sodium (HPS) lamps, alone or in combination with metal halide (MH) plus quartz iodide (QI) incandescent lamps, to support lettuce growth, with or without N supplementation. Varying exposures to radiation from combined HPS, MH, and QI lamps influenced dry weight gain and photosynthetic pigment content of hydroponically grown Black-Seeded Simpson' lettuce (Lactuca sativa L.) seedlings. Cumulative leaf dry weight declined with increasing exposure, up to 20 hours per day, to 660 micromoles m-2 s-1 of photosynthetically active radiation (PAR) from HPS lamps concomitant with constant 20 hours per day of 400 micromoles m-2 s-1 from MH + QI lamps. Leaves progressively yellowed with increasing exposure to radiation from the three-lamp combination, corresponding to lower specific chlorophyll content but not to specific carotenoid content. Lettuce grown under 20-hour photoperiods of 400, 473, or 668 micromoles m-2 s-1 from HPS radiation alone had the highest leaf dry weight at a PPF of 473 micromoles m-2 s-1. Chlorophyll, but not carotenoid specific content, decreased with each incremental increase in PPF from HPS lamps. Doubling the level of N in nutrient solution and supplying it as a combination of NH4+ and NO3- partially ameliorated adverse effects of high PPF on growth and pigment content relative to treatments using single-strength N as NO3-. SN - 0018-5345 UR - https://www.unboundmedicine.com/medline/citation/11537726/Modification_of_yield_and_chlorophyll_content_in_leaf_lettuce_by_HPS_radiation_and_nitrogen_treatments_ DB - PRIME DP - Unbound Medicine ER -