LIBRO-CONGRESO-CITRUS

S17
recorded during the previous 21 days. The correlation between the loss of greenness in lemon peel and
temperature increases if the mean of the minimum temperatures is considered, rather than the average
of the means. The negative values of the colour coordinate “a” decrease (decreased greenness of the peel)
with temperatures below 15-17 ºC, increasing as the minimum temperatures fall until they reach zero. The
colour coordinate “a” and the mean minimum temperature for the 21 days preceding the measurement
provides excellent adjustments. The good values of R2 for the varieties ‘Eureka’, ‘Fino’ and ‘Lisbon’ show that
the synthesis of the many carotenoids in the peel varies as a function of temperature. The model present a
higher correlation considering not only temperatures but colour coordinate a in a previous observation. For
this purpose we are going to use a fixed type model.
S17P27
Determination of the geographical origin of navel orange by near infrared spectroscopy
Su X.S. 1 , Zhang X.Y. 2 , Jiao B.N. 2 , and Cao W.Q. 1
1 College of Chemistry and Chemical Engineering, Southwest University, China; and 2 Citrus Research Institute, Chinese Academy of
Agricultural Sciences/Citrus Research Institute, Southwest University, China. suxuesu@163.com
The capacity to identify the geographical origins of navel orange samples obtained from Jiangxi, Chongqing
and Hunan provinces, was studied by near infrared reflectance spectroscopy (NIRS). Three models of navel
orange traceability were developed using the first derivative (9 points smoothing) of spectra at 1140-1170
nm combined with Soft Independent Modeling of Class Analogy (SIMCA). The three models were considered
optimized when principal components were 2. Under the 5% significance level, the identification rates
of the three models for sample calibration was all 100%, and the rejection rates were 85.7%, 83.3% and
100%, respectively; while the identification rates for sample validation were all 100%, and the rejection
rates were 100%, 89.5% and 100%, respectively. Giving values 0, 1, -1 for Jiangxi, Chongqing and Hunan
classes as category variable, partial least squares-discrimination analysis models(PLS-DA) were established to
determine geographical origins of navel oranges. The best models were developed using raw spectra at 950-
1650 nm when principal components were 13. The results showed that the correlation between the predicted
category variable and the measured category variable was significant with high correlation coefficient (R2,
0.973), low root mean square error of calibration (RMSEC, 0.109) and root mean square error of prediction
(RMSEP, 0.159). The identification rates of PLS-DA model for calibration and validation samples were both
100%. These results indicated that NIRS coupled with SIMCA and PLS-DA methods can be used for quickly and
accurately discriminating geographical origin of navel orange samples.
S17P28
A new lemon genotype for ornamental use obtained by gamma irradiation
Uzun A. 1 , Gulsen O. 1 , Kafa G. 2 , and Seday U. 2
1 Erciyes University, Department of Horticulture, Turkey; and 2 Alata Horticultural Research Station, Genetics and Breeding, Turkey.
aydinuzun@erciyes.edu.tr
Some citrus species and cultivars with attractive appearance of fruits and leaves are used for ornamental
purposes. Some of them have small fruit and plant size and mixed color of leaves or fruits. We report here a new
lemon genotype with potential use for ornamental purposes. This genotype was obtained exposing budwood
of the ‘Kutdiken’ lemon cultivar to gamma irradiation. This variety is widely grown in Turkey because of its high
yield and good quality fruits. Fruits of the new genotype have attractive appearance with vertical brown lines
and brown point heaps. Differences of fruit rind of this genotype have originated from mutation/mutations
caused by gamma irradiation. This genotype has a good potential for ornamental use indoors or in gardens.
S17P29
New mandarin triploid hybrids `Aya´ and `Hana´ selected in Morocco
Handaji N. 1 , Benyahia H. 1 , Benaouda H. 1 , Arsalane N. 1 , and Srairi I. 2
1 Institut National de la Recherche Agronomique (INRA), Morocco; and 2 Domaine Kabbage, Morocco. citrusinra@yahoo.fr
Triploidy has played important role in development of new seedless mandarin cultivars for fresh fruit market
and have received increasing attention for the consumers. Many series of diploid x diploid crosses were
318 - VALENCIA CONFERENCE CENTER, 18th-23rd NOVEMBER 2012