LIBRO-CONGRESO-CITRUS

S18
potentially very interesting for the Spanish citrus industry, but they are juvenile and do not produce seeds for
conventional evaluation. In 2011, a collaboration between Agromillora and IVIA began for the multiplication
and evaluation of new citrus somatic hybrid rootstocks. We will present the development of a protocol for
the micropropagation of three allotetraploid somatic hybrids. We have determined the conditions for the in
vitro introduction and the establishment of lines in the laboratory, obtaining highly efficient multiplications
rates. The environmental conditions in the greenhouse for the successful acclimatization and growth have
also been set. Finally, we have accomplished the large-scale adaptation for efficient commercial propagation.
This is allowing a very quick process to start evaluation at large scale.
S18P13
Performance of ‘Forner-Alcaide 5’ and ‘Forner-Alcaide 517’ with ‘Loretina’ clementine.
Molina-Nadal M.D. 1 , De Miguel A. 1 , Valero J.L. 1 , Ripoll F. 2 and Forner-Giner M.A. 1
1 Instituto Valenciano de Investigaciones Agrarias (IVIA), Centro de Citricultura y Producción Vegetal, Spain; and 2 Cooperativa de
Algemesí (COOPAL), Spain. molina_marnad@gva.es
The influence of two citrus rootstocks, ‘Forner-Alcaide 5’ [Citrus reshni x Poncirus trifoliata] and ‘Forner-
Alcaide 517’ [‘King’ mandarin (Citrus nobilis) x P. trifoliata] a semidwarfing rootstock, on growth, yield and
fruit quality on ‘Loretina’ clementine (Citrus clementina) has been analysed. Trees were grown in a plot in
Algemesi, near Valencia (Spain) and had been planted in 2000. Yield was weighed during five harvest, and
fruit quality and tree size determined in 2011. Tree size of plants grafted on ‘Forner-Alcaide 517’ grow 40%
less than ‘Forner-Alcaide 5’. Yield efficiency (kg/m3) in 2011 between rootstocks has no differences. Fruit size
is smaller in ‘Forner-Alcaide 517’ than in ‘Forner-Alcaide 5’, but sugar content and acidity is higher in ‘Forner-
Alcaide 517’ than in ‘Forner-Alcaide 5’.
S18P14
Performance of three rootstocks with ‘Clemenrubi’ and ‘Orogros’ clementines cultivated under
screen.
Molina-Nadal M.D 1 , de Miguel A. 1 , Bonafé C. 1 , Valero J.L. 1 , Ripoll F. 2 and Forner-Giner M.A. 3
1 Instituto Valenciano de Investigaciones Agrarias (IVIA), Servivio de transferencia de tecnología de Carcaixent, Spain; 2 Cooperativa
Agraria de Algemesí (COOPAL), Spain; and 3 Instituto Valenciano de Investigaciones Agrarias (IVIA), Centro de Citricultura y Producción
Vegetal, Spain. molina_marnad@gva.es
In a screenhouse trial planted in 2004 and grafted in 2005 with two precocious clementines, ‘Clemenrubi’ and
‘Orogros’ (Citrus clementina), three citrus rootstocks: ‘Carrizo’ and ‘C-35’ citranges [Citrus sinensis x Poncirus
trifoliata] and ‘Forner-Alcaide 5’ [Citrus reshni x P. trifoliata] were evaluated in an orchard near Valencia. Yield,
fruit size and fruit quality were evaluated for the last four years. Tree size has been evaluated the last year.
In the last yield, ‘Forner-Alcaide 5’ and ‘C-35’ showed no differences, but ‘C-35’ is the rootstock that showed
higher cumulative yield of the three rootstocks involved in the experiment. Citrange ‘Carrizo’ presented
smaller fruit size, juice content in both varieties, than the other rootstocks, but higher peel thickness. Fruits
on ‘Forner-Alcaide 5’ had higher maturity index. All the plants in the experiment showed multiple shooting
alterations in the truck of the variety. For this reason, 30% of fruits of ‘Clemenrubi’ and 7% on ‘Orogros’
grafted on ‘Carrizo’ citrange had dry juice sacs. ‘Forner-Alcaide 5’ presented only 1% of fruits affected and
‘C-35’ 3%, in both cultivars.
S18P15
Rootstock influence on the incidence of fruit splitting in navel oranges
Mesejo C., Reig C., Martínez-Fuentes A. and Agustí M.
Instituto Agroforestal Mediterraneo. Universitat Politècnica de València (IAM-UPV), España. carmeco@upv.es
This study aimed to determine the influence of four rootstocks, ‘Cleopatra’ mandarin (Citrus reshni), ‘Carrizo’
and ‘C-35’ citranges [Citrus sinensis X Poncirus trifoliata], and ‘FA-5’ [C. reshni X P. trifoliata], on the incidence
of fruit splitting in ‘Chislett’ and ‘Lane-late‘ navel oranges (C. sinensis). ‘Carrizo’ and ‘C-35’ citranges showed
332 - VALENCIA CONFERENCE CENTER, 18th-23rd NOVEMBER 2012