Articles
CALCIUM EFFECT ON K, CA AND MG CONCENTRATIONS IN XYLEM SAP OF TOMATO CVS. MARGLOBE AND CARMELO
Article number
412_49
Pages
416 – 424
Language
Abstract
Differences in the cation uptake and transport capacity between two tomato cultivars, Carmelo and Marglobe, were studied.
Plants (9–11 weeks old) were grown under two levels of Ca (1.0 and 4.0 mmol l-1) in a Hoagland’s nutrient solution.
Samples of root xylem exudate, press sap of stems and petioles, and leaves were taken after 0, 2, 5, 7, 10 and 15 days of the beginning treatments.
K, Ca and Mg concentrations were determined in sap samples and digested leaves.
A reduction in Ca contents was found in all samples from plants grown under low-Ca treatment for both cultivars.
However, this reduction was more dramatic in cv.
Marglobe press-sap than in cv.
Carmelo.
The opposite behaviour was found for Mg concentrations, which increased during the treatment period.
In this way, cv.
Marglobe plants showed higher Mg level in the press-sap than cv.
Carmelo, which was in concordance with the Careduction in this plant material.
These results might suggest a partial Ca-replacement by Mg.
On the other hand, K concentrations were not clearly affected by low-Ca treatment.
The main effects of the low-Ca treatment were found in sap samples, being in the press-sap where higher significant differences between cultivars were observed.
Thus, the capacity of Ca-transport was lower in Marglobe than in Carmelo and, therefore, cv.
Carmelo was more Ca-efficient under low-Ca stress.
In addition, the study of saps allows to asses the capacity of cation transport in different tomato cultivars and, thereby, to predict cation behaviours under nutritional stresses.
Plants (9–11 weeks old) were grown under two levels of Ca (1.0 and 4.0 mmol l-1) in a Hoagland’s nutrient solution.
Samples of root xylem exudate, press sap of stems and petioles, and leaves were taken after 0, 2, 5, 7, 10 and 15 days of the beginning treatments.
K, Ca and Mg concentrations were determined in sap samples and digested leaves.
A reduction in Ca contents was found in all samples from plants grown under low-Ca treatment for both cultivars.
However, this reduction was more dramatic in cv.
Marglobe press-sap than in cv.
Carmelo.
The opposite behaviour was found for Mg concentrations, which increased during the treatment period.
In this way, cv.
Marglobe plants showed higher Mg level in the press-sap than cv.
Carmelo, which was in concordance with the Careduction in this plant material.
These results might suggest a partial Ca-replacement by Mg.
On the other hand, K concentrations were not clearly affected by low-Ca treatment.
The main effects of the low-Ca treatment were found in sap samples, being in the press-sap where higher significant differences between cultivars were observed.
Thus, the capacity of Ca-transport was lower in Marglobe than in Carmelo and, therefore, cv.
Carmelo was more Ca-efficient under low-Ca stress.
In addition, the study of saps allows to asses the capacity of cation transport in different tomato cultivars and, thereby, to predict cation behaviours under nutritional stresses.
Authors
E. Lozano-Rodríguez, R.O. Carpena-Ruiz, A. Gárate
Keywords
Lycopersicon esculentum, Ca-transport, root xylem exudate, pressure sap, leaf, Ca-Mg relationship
Online Articles (68)