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Relationship between lead uptake by lettuce and water-soluble low-molecular-weight organic acids in rhizosphere as influenced by transpiration.
J Agric Food Chem. 2007 Oct 17; 55(21):8640-9.JA

Abstract

The relationship between Pb uptake by leaf lettuce (Lactuca sativa L.) and water-soluble low-molecular-weight organic acids (LMWOAs) in rhizosphere, as influenced by transpiration (high and low), has been studied. Studies were carried out by culturing lettuce plants grown for 2 weeks in pots filled with quartz sand mixed with anion-exchange resin and then for 30 days in a greenhouse. The potted lettuce plants were subjected to stress by the addition of Pb(NO 3) 2 solutions (100, 200, and 300 mg of Pb L (-1)) and by high and low transpiration treatments for another 10-day period. Blank experiments (without addition of Pb(NO 3) 2 solutions to the pots) were also run. There were no significant differences in the growth of the plants with the addition of Pb(NO 3) 2 solutions in either of the transpirations studies. Uptake of Pb by the shoots and roots of the plants was found to be proportional to the concentration of Pb solutions added, and more accumulation was observed in the roots than in the shoots at the end of days 3 and 10. High transpiration caused more Pb uptake than did low transpiration. One volatile acid (propionic acid) and nine nonvolatile acids (lactic, glycolic, oxalic, succinic, fumaric, oxalacetic, d-tartaric, trans-aconitic, and citric acids) in rhizosphere quartz sand or anion-exchange resin were identified and quantified by gas chromatography analysis with a flame ionization detector. The amount of LMWOAs in rhizosphere quartz sand or anion-exchange resin increased with higher amounts of Pb in quartz sand solution and also with longer duration of the study. The total quantities of the LMWOAs in the rhizosphere quartz sand or anion-exchange resin were significantly higher under high and low transpiration with a 300 mg of Pb L (-1) solution addition at the end of day 10. Compared with our previous related studies (published work), the present study shows that the presence of LMWOAs in rhizosphere does not significantly affect Pb uptake by lettuce plants under high and low transpiration. A physiological mechanism of the roots of lettuce plants governing the relationship between Pb contamination level and quantity of water-soluble LMWOAs in rhizosphere quartz sand and resin, as influenced by transpiration, was proposed.

Authors+Show Affiliations

Environmental Division, Agricultural Engineering Research Center, Chungli Township 320, Taoyuan County, Taiwan.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

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

Language

eng

PubMed ID

17894455

Citation

Liao, Yuan Chung, et al. "Relationship Between Lead Uptake By Lettuce and Water-soluble Low-molecular-weight Organic Acids in Rhizosphere as Influenced By Transpiration." Journal of Agricultural and Food Chemistry, vol. 55, no. 21, 2007, pp. 8640-9.
Liao YC, Chang Chien SW, Wang MC, et al. Relationship between lead uptake by lettuce and water-soluble low-molecular-weight organic acids in rhizosphere as influenced by transpiration. J Agric Food Chem. 2007;55(21):8640-9.
Liao, Y. C., Chang Chien, S. W., Wang, M. C., Shen, Y., & Seshaiah, K. (2007). Relationship between lead uptake by lettuce and water-soluble low-molecular-weight organic acids in rhizosphere as influenced by transpiration. Journal of Agricultural and Food Chemistry, 55(21), 8640-9.
Liao YC, et al. Relationship Between Lead Uptake By Lettuce and Water-soluble Low-molecular-weight Organic Acids in Rhizosphere as Influenced By Transpiration. J Agric Food Chem. 2007 Oct 17;55(21):8640-9. PubMed PMID: 17894455.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Relationship between lead uptake by lettuce and water-soluble low-molecular-weight organic acids in rhizosphere as influenced by transpiration. AU - Liao,Yuan Chung, AU - Chang Chien,Shui-Wen, AU - Wang,Min-Chao, AU - Shen,Yuan, AU - Seshaiah,Kalluru, Y1 - 2007/09/26/ PY - 2007/9/27/pubmed PY - 2007/12/6/medline PY - 2007/9/27/entrez SP - 8640 EP - 9 JF - Journal of agricultural and food chemistry JO - J Agric Food Chem VL - 55 IS - 21 N2 - The relationship between Pb uptake by leaf lettuce (Lactuca sativa L.) and water-soluble low-molecular-weight organic acids (LMWOAs) in rhizosphere, as influenced by transpiration (high and low), has been studied. Studies were carried out by culturing lettuce plants grown for 2 weeks in pots filled with quartz sand mixed with anion-exchange resin and then for 30 days in a greenhouse. The potted lettuce plants were subjected to stress by the addition of Pb(NO 3) 2 solutions (100, 200, and 300 mg of Pb L (-1)) and by high and low transpiration treatments for another 10-day period. Blank experiments (without addition of Pb(NO 3) 2 solutions to the pots) were also run. There were no significant differences in the growth of the plants with the addition of Pb(NO 3) 2 solutions in either of the transpirations studies. Uptake of Pb by the shoots and roots of the plants was found to be proportional to the concentration of Pb solutions added, and more accumulation was observed in the roots than in the shoots at the end of days 3 and 10. High transpiration caused more Pb uptake than did low transpiration. One volatile acid (propionic acid) and nine nonvolatile acids (lactic, glycolic, oxalic, succinic, fumaric, oxalacetic, d-tartaric, trans-aconitic, and citric acids) in rhizosphere quartz sand or anion-exchange resin were identified and quantified by gas chromatography analysis with a flame ionization detector. The amount of LMWOAs in rhizosphere quartz sand or anion-exchange resin increased with higher amounts of Pb in quartz sand solution and also with longer duration of the study. The total quantities of the LMWOAs in the rhizosphere quartz sand or anion-exchange resin were significantly higher under high and low transpiration with a 300 mg of Pb L (-1) solution addition at the end of day 10. Compared with our previous related studies (published work), the present study shows that the presence of LMWOAs in rhizosphere does not significantly affect Pb uptake by lettuce plants under high and low transpiration. A physiological mechanism of the roots of lettuce plants governing the relationship between Pb contamination level and quantity of water-soluble LMWOAs in rhizosphere quartz sand and resin, as influenced by transpiration, was proposed. SN - 0021-8561 UR - https://www.unboundmedicine.com/medline/citation/17894455/Relationship_between_lead_uptake_by_lettuce_and_water_soluble_low_molecular_weight_organic_acids_in_rhizosphere_as_influenced_by_transpiration_ L2 - https://doi.org/10.1021/jf071491a DB - PRIME DP - Unbound Medicine ER -
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