Volume 63 Number 2 Article 6
Year 2009 Month 4
Title: Performance of Forner-Alcaide 5 and Forner-Alcaide 13, hybrids of Cleopatra mandarin x Poncirus trifoliate, as Salinity-Tolerant Citrus Rootstocks
Authors: M. Angeles Forner-Giner, E. Primo-Millo and J.B. Forner
Abstract:
Chloride and sodium concentrations and gas exchange parameters were measured on leaves of ‘Valencia’ orange
scions grafted onto the rootstocks Cleopatra mandarin (CM), Poncirus trifoliata (PT) and their hybrids Forner-Alcaide 5 (FA-5) and Forner-Alcaide 13 (FA-13), grown in pots with different concentrations of NaCl in the external
medium.
Scions on CM accumulated less Cl- in their leaves than scions on PT. However, Na+ concentrations were
lower in scions on PT than on CM. Leaf Cl- exclusion appears to be transmitted to F1 hybrids FA-5 and FA-13.
Also, the limited transport of Na+ from rootstock to scions on PT was transmitted to FA-5. Leaf gas exchange
parameters in salt-treated plants were reduced to different extents, depending on the rootstock.
The decreases in net
CO2 assimilation and transpiration were more pronounced in CM, followed by PT and FA-13. The lowest reductions
in both parameters occurred in scions on FA-5. The results indicate that, both in terms of saline ion exclusion and
gas exchange parameters, FA-5 was the most tolerant genotype to salinity of the four studied, followed by FA-13.
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