Volume 63 Number 2 Article 6 Pages: 72-80
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
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
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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