Salinity Effect on Plant Physiological and Nutritional Parameters of New Huanglongbing Disease-Tolerant Citrus Rootstocks

Salinity is a major agriculture problem for citrus in the Mediterranean basin, which is a major global producer region. Citrus crops are also threatened by emerging diseases such as Huanglongbing (HLB). The use of different rootstocks increases the variability of citrus plant material in orchards, t...

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Bibliographic Details
Published in:Agronomy (Basel) 2021-04, Vol.11 (4), p.653
Main Authors: Aparicio-Durán, Lidia, Hervalejo, Aurea, Calero-Velázquez, Rocío, Arjona-López, Juan M., Arenas-Arenas, Francisco J.
Format: Article
Language:English
Subjects:
Abiotic stress
chloride
Chlorophyll
Citroncirus webberi
Crop diseases
Crops
Damage prevention
Experiments
Food quality
Fruits
HLB
Laboratories
Leaves
NaCl
Orchards
Parameters
Pathogens
Physiological effects
Physiology
Plant bacterial diseases
Plant growth
Rootstocks
Salinity
Salinity effects
Salt
salt-stress tolerance
Signs and symptoms
Sodium chloride
SPAD
Trees
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Summary:Salinity is a major agriculture problem for citrus in the Mediterranean basin, which is a major global producer region. Citrus crops are also threatened by emerging diseases such as Huanglongbing (HLB). The use of different rootstocks increases the variability of citrus plant material in orchards, thus preventing extensive damage caused by abiotic and/or biotic diseases. In this work, we have evaluated the salinity response of five citrus rootstocks (US942, US897, X639, Forner Alcaide No. 5 and Carrizo citrange) some of which have known tolerance to HLB, under Mediterranean conditions. Four treatments with different salt concentrations (0, 25, 50 and 75 mM of NaCl) were applied by watering the plants three times per week for eleven weeks. Chlorophyll index (SPAD), growth and plant symptom parameters were recorded on a biweekly basis. At the end of the trial, roots, stem and leaves biomass and plant mineral content were obtained. The increasing concentration of NaCl resulted in visible leave damage symptoms for all citrus rootstocks assayed, hindering plant growth in all citrus rootstocks assayed, except for X639. The highest concentration of toxic ions in leaves was detected in Carrizo citrange and US897 for Cl−, while the lowest concentration of Na+ was obtained in X639. These results provide growers with information about the sensitivity to salinity of different citrus rootstocks.
ISSN:2073-4395
2073-4395
DOI:10.3390/agronomy11040653