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Solute balance of a maize (Zea mays L.) source leaf as affected by salt treatment with special emphasis on phloem retranslocation and ion leaching
Solute balance of a maize (Zea mays L.) source leaf as affected by salt treatment with special emphasis on phloem retranslocation and ion leaching
- Source :
- Journal of Experimental Botany. 51:1721-1732
- Publication Year :
- 2000
- Publisher :
- Oxford University Press (OUP), 2000.
-
Abstract
- Strategies for avoiding ion accumulation in leaves of plants grown at high concentration of NaCl (100 mol m(-3)) in the rooting media, i.e. retranslocation via the phloem and leaching from the leaf surface, were quantified for fully developed leaves of maize plants cultivated hydroponically with or without salt, and with or without sprinkling (to induce leaching). Phloem sap, apoplastic fluid, xylem sap, solutes from leaf and root tissues, and the leachate were analysed for carbohydrates, amino acids, malate, and inorganic ions. In spite of a reduced growth rate Na(+) and Cl(-) concentrations in the leaf apoplast remained relatively low (about 4-5 mol m(-3)) under salt treatment. Concentrations of Na(+) and Cl(-) in the phloem sap of salt-treated maize did not exceed 12 and 32 mol m(-3), respectively, and thus remained lower than described for other species. However, phloem transport rates of these ions were higher than reported for other species. The relatively high translocation rate of ions found in maize may be due to the higher carbon translocation rate observed for C(4) plants as opposed to C(3) plants. Approximately 13-36% of the Na(+) and Cl(-) imported into the leaves through the xylem were exported by the phloem. It is concluded that phloem transport plays an important role in controlling the NaCl content of the leaf in maize. Surprisingly, leaching by artificial rain did not affect plant growth. Ion concentrations in the leachate were lower than reported for other plants but increased with NaCl treatment.
- Subjects :
- 0106 biological sciences
Physiology
Plant Science
Sodium Chloride
Inorganic ions
Biology
Zea mays
01 natural sciences
03 medical and health sciences
Botany
Phloem transport
Poaceae
Leaching (agriculture)
Ion transporter
030304 developmental biology
Ions
2. Zero hunger
0303 health sciences
fungi
food and beverages
Xylem
Biological Transport
15. Life on land
Apoplast
Plant Leaves
Phloem
010606 plant biology & botany
Subjects
Details
- ISSN :
- 14602431 and 00220957
- Volume :
- 51
- Database :
- OpenAIRE
- Journal :
- Journal of Experimental Botany
- Accession number :
- edsair.doi.dedup.....03465bc78f0dc17dc650a2ba9f9ba94b
- Full Text :
- https://doi.org/10.1093/jexbot/51.351.1721