Journal Article

Citrus response to salinity: growth and nutrient uptake

Dionisio Ruiz, Vicente Martínez and Antonio Cerdá

in Tree Physiology

Volume 17, issue 3, pages 141-150
Published in print March 1997 | ISSN: 0829-318X
Published online March 1997 | e-ISSN: 1758-4469 | DOI: http://dx.doi.org/10.1093/treephys/17.3.141
Citrus response to salinity: growth and nutrient uptake

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To determine the effects of salinity on relative growth rate (RGR), net assimilation rate on a leaf weight basis (NARw), leaf weight ratio (LWR), and nutrient uptake and utilization of citrus, we grew four citrus rootstocks (sour orange, Cleopatra mandarin, Carrizo citrange and Citrus macrophylla) in nutrient solutions containing 0, 10, 20, 40 or 80 mM NaCl for 20, 40 or 60 days. For each element analyzed, specific absorption rate (SAR) and specific utilization rate on a leaf basis (SURL) were calculated for the period between Days 40 and 60. Relative growth rate decreased with time for all treatments and rootstocks. Salt treatment significantly reduced both RGR and NARw, whereas LWR showed no definite trend. In all rootstocks, NARw, but not LWR, was significantly correlated with RGR, indicating that NARw was an important factor underlying the salinity-induced differences in RGR among the citrus rootstocks. At Day 60, salinity had a significant effect on leaf concentrations of Cl, Na, K, Ca, Mg, P, Fe, Mn and Zn and on the SAR and SURL of most elements. In general, RGR was correlated with SAR and SURL. Therefore, in addition to osmotic effects and the inhibitory effects of high concentrations of Cl and Na+, an imbalance of essential nutrients may also contribute to the reduction in plant growth under saline conditions.

Keywords: growth analysis; NaCl; net assimilation rate; rootstock; specific absorption rate; specific utilization rate

Journal Article.  0 words. 

Subjects: Plant Sciences and Forestry

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