Salinity Tolerance of Cleopatra Mandarin and Carrizo Citrange Citrus Rootstock Seedlings Is Affected by CO2 Enrichment during Growth
By F. García-Sánchez, J. Syvertsen. 2006
106 citations recorded by the source corpus.
, shoot/root ratio, water relations ABSTRACT. Three-month-old citrus rootstock seedlings of the Cl - excluder Cleopatra mandarin (Citrus reticulata Blanco) and the Cl - accumulator Carrizo citrange (C. sinensis (L.) Osb. x Poncirus trifoliata L.) were fertilized with nutrient solution with or without additional 50 mM NaCl and grown at either ambient CO2 (360 μL·L -1 ) or elevated CO2 (700 μL·L -1 ) in similar controlled environment greenhouses for 8 weeks. Elevated CO2 increased plant growth, shoot/root ratio, leaf dry weight per area, net assimilation of CO2, chlorophyll, and water-use effi ciency but decreased transpira- tion rate. Elevated CO2 decreased leaf Ca 2+ and N concentration in non-salinized Cleopatra. Salinity increased leaf Cl - and Na + in both genotypes. Carrizo had higher concentrations of Cl - but lower Na + in leaves than Cleopatra. Salin- ity decreased plant growth, shoot/root ratio, net gas exchange, water use, and root Ca +2 but increased root N in both genotypes regardless of CO2 level. Neither salinity nor elevated CO2 affected leaf chlorophyll fl uorescence (Fv/Fm). Carrizo had higher Fv/Fm, leaf gas exchange, chlorophyll, N, and Ca 2+ than Cleopatra. Salinity-induced decreases in leaf osmotic potential increased leaf turgor especially at elevated CO2. The increase in leaf growth at elevated CO2 was greater in salinized than in nonsalinized Carrizo but was similar in Cleopatra seedlings regardless of salt treatment. In addition, salinity decreased water-use effi ciency more at elevated CO2 than at ambient CO2 in Cleopatra but not in Carrizo. Elevated CO2 also decreased leaf Cl - and Na + in Carrizo but tended to increase both ions in Cleopatra leaves. Based on leaf growth, water-use effi ciency and salt ion accumulation, elevated CO2 increased salinity tolerance in the relatively salt-sensitive Carrizo more than in the salt-tolerant Cleopatra. In salinized seedlings of both genotypes, Cl -
Subfields: Global and Planetary Change, Plant Science
View Paper: https://www.semanticscholar.org/paper/f467f4a1bd67f7b000bfee2310f457a5cc83d613
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Citations in the corpus
- Physiological analysis of salt stress behaviour of citrus species and genera: Low chloride accumulation as an indicator of salt tolerance (2012, background): “The primary effects of salinity in citrus are decreased stomatal conductance leading to reduced CO2 diffusion and ultimately decreased net photosynthesis (García-Sánchez and Syvertsen, 2006) and increased ion accumulation (Brumós et al.”
- Overcoming Salinity Barriers to Crop Production Using Traditional Methods (2013, background): “The importance of grafting in fruit trees to overcome salinity hazards has been shown in citrus (Sykes, 1985; Moya et al., 2003; Garcia-Sanchez and Syvertsen, 2006; Tavallali et al., 2008; Gimeno et al., 2009, 2010; Montoliu et al., 2009), wine and table grapes (Walker et al., 2004; Hepaksoy et…”