LIBRO-CONGRESO-CITRUS

S09P13
Organoleptic quality and preservation of fruits tangerines cold storage in relation to application
of waxes for postharvest
Nascimento L.M., Machado M.A., Brito M.C.R., Moreira J., Brito P.C.N., and Sanches J.M.
Instituto Agronômico, Brasil. lenice@centrodecitricultura.br
This study aimed to develop new wax formulations with the requirements of the integrated citrus fruit
production, in order to maintain the quality of citrus fruit with high commercial potential. These new wax
formulations were suited to citrus varieties under study and the local conditions of production in the State of
Sao Paulo and other Brazilian regions, allowing the production of fruits with good appearance and minimal
change in flavor. The development of new formulations requires a detailed and comprehensive physiological
study to allow the availability of reliable products that do not interfere with the physicochemical properties
of the fruit during marketing. For that reason, it was necessary to evaluate some physical and chemical
parameters that may somehow interfere with the flavor and appearance of the fruit. We evaluated two
cultivars of mandarin: ‘Ponkan’ and ‘Decopon’. The main parameters analyzed to evaluate the effectiveness of
new wax formulations were: texture, skin color, total acidity, soluble solids, °Brix, ratio, brightness, alcohols,
weight loss and internal fruit quality by NMR. We evaluated the genetic code by the production region of the
cultivars. The results showed that some formulations led to the change of taste, when subjected to sensory
test by a panel of trained tasters.
S09P14
Effect of storage temperature on pitting development in satsuma ‘Okitsu’
Nuñez F.N. 1 , del Campo R.d.C. 2 , Pascale D.P. 3 , Díaz L.D. 2 , Solari J.S. 3 , Larrechart L.L. 1 , and Mara H.M. 2
1 Empresa Citrícola (NORIDEL S.A.), Salto, Uruguay; 2 Instituto de Investigaciones Biológicas ‘Clemente Estable’ (IIBCE), Montevideo,
Uruguay; and 3 Empresa Citrícola (MODISUR S.A), Salto, Uruguay. raqueldc60@gmail.com
Rind disorders on satsuma mandarin originate serious postharvest losses in Uruguay. Causes of these disorders
are not well understood and their incidence is erratic, with high variability from year to year and among
orchards. Satsuma fruit suffered chilling injury during cold storage, and pitting are common postharvest
symptoms. The objective of this study was to analyze fruit responses to different storage temperatures
on pitting development and the incidence of different drench treatments on both fruit rot and pitting
development. Satsuma ‘Okitsu’ fruit were harvested from two different farms, one with high pitting history
(Q102) and the other with low pitting history (Q100). Fruit from each farm were drenched with five different
treatments and compared to a non-treated control. After the drench treatment, fruit were degreened, waxed
and stored at three different temperatures: 3°C, 6°C and room temperature, during 30 days. Fruit stored at
room temperature did not show pitting. Fruit stored at 3°C showed the greatest pitting incidence. Farm Q102
showed higher incidence of pitting than farm Q100. The different drench treatments affected rot incidence
but not pitting level. Fruit stored at 3°C and 6°C had less incidence of fruit decay than that stored at room
temperature. Rind samples from fruit with high pitting of Q102 and from fruit without pitting from both
orchards Q100 and Q102 were analyzed for their nutrient composition.
S09P15
RNA-seq and phenylpropanoid metabolism of orange-Penicillium digitatum interaction
Ballester A.R. 1 , Marcet-Houben M. 2 , Gabaldón T. 2 , Lafuente M.T. 1 , and González-Candelas L. 1
1 Instituto de Agroquímica y Tecnología de Alimentos (IATA-CSIC), Food Science Department, Valencia, Spain; and 2 Centre for Genomic
Regulation (CRG-UPF), Comparative Genomics, Barcelona, Spain. ballesterar@iata.csic.es
Penicillium digitatum is the causal agent of the Green Mold Rot of citrus fruit, being the major postharvest
pathogen of these fruits in the Mediterranean-climate regions. The application of fungicides constitutes the
most common method to control postharvest diseases. However, due to the development of resistance to
fungicides among fungal pathogens and the growing public concern on their effects on human health and
environment, there is a need to develop alternative methods to control postharvest diseases. In this study,
XII INTERNATIONAL CITRUS CONGRESS 2012 - 143
S09