Agronomic performance of Pera and related sweet orange accessions naturally infected with Citrus tristeza virus in northern Paraná State, Brazil

Abstract

Despite of the susceptibility to the Citrus tristeza virus (CTV), Pera sweet orange is the most important citrus cultivar in Brazil. The objective of this study was to evaluate the CTV aggressiveness and the relationship with the agronomic performance of 24 accessions of Pera and related sweet oranges. Accessions belonging to the Citrus Germplasm Collection of the Instituto Agronômico do Paraná (IAPAR), Londrina, PR, were included in the study. Citrus tristeza disease was rated based on the severity of stem pitting symptoms. Yields were evaluated in the 2010/2011, 2011/2012, and 2012/2013 seasons, and tree growth in 2012. The best performance regarding stem pitting severity was shown by Redonda accession, followed by Ipiguá II. Vegetative tree vigor was more evident for Redonda, Tardia CO3, and Guilherme Spagnol accessions. These Pera and related sweet oranges accessions also showed the highest fruit yields, along with Vimusa, Santa Tereza, Ipiguá, Ipiguá II, D-6, and Paulo Rosa. Vegetative tree vigor, yield and number of fruits were inversely correlated with citrus tristeza disease stem pitting severity. Therefore, the poor agronomic performance of some Pera and related sweet oranges is probably related to the presence of severe CTV complexes infecting these accessions.

Citrus tristeza disease severity and agronomic performance of ‘Pêra’ sweet orange cultivars and selections in the North and Northwest regions of the State of Paraná, Brazil

“…The development of the citrus trees, including canopy diameter and volume, vegetative vigor index and tree height, was negatively correlated with the severity of the disease symptoms in these two locations (Tables 2 and 3). These data confirm the results obtained in previous studies, where a negative correlation between these citrus trees development variables and stem pitting severity were already established for 'Pêra' sweet orange cultivars of the Citrus germplasm Collection of IaPaR (BaBa et al, 2014).…”

“…In another study with accessions of Pêra sweet oranges from the Citrus germplasm Collection of the Instituto agronômico do Paraná-IaPaR, in londrina, I-58 Vacinada 3, I-59 Vacinada 4, and I-89 Bianchi, here designated IPR 158, IPR 159 and IPR 153, respectively, showed severe stem pitting symptoms (BaBa et al, 2014). These differences in citrus tristeza disease severity may be due to the presence of different CTV haplotypes, in combination with differences in sensibility of the plant tissues to the virus, besides the effect of environmental conditions (BaBa et al, 2014), as discussed previously in this study.…”

“…On the other hand, industrial characteristics of the fruits were barely affected (BORDIgNON et al, 2003b). Baba et al (2014) also evaluated the effect of the citrus tristeza disease severity on the agronomic performance of 24 accessions of 'Pêra' and related sweet orange. They observed the highest correlations between disease severity and yield, number of fruits, and vegetative vigor index.…”

Severity and genetic diversity of Citrus tristeza virus complexes infecting ‘Pêra Bianchi’ sweet orange in Paraná, Brazil

“…The most common symptoms of citrus tristeza in 'Pêra' sweet orange grafted on rootstocks tolerant to CTV are stem pitting in the trunk and branches, small and chlorotic leaves, undersized and deformed fruits, and general stunting of the citrus trees (Bennett and Costa 1949;Souza and Müller 2006;Moreno et al 2008;Dawson et al 2013Dawson et al , 2015. Furthermore, the severity of stem pitting in trees of 'Pêra' sweet orange has also been associated with poor agronomic performance regarding vegetative vigor and yield (Baba et al 2014;Giampani et al 2016).…”

In vitro Evaluation of Ca, Cu, and Mg Bioaccessibility in Fresh and Dried Fruits

“…These species, which have adapted to the local soil conditions to produce fruits of excellent taste and quality, contribute to national production and are currently exported to many countries. [14][15][16][17][18][19][20][21][22][23] According to the Brazilian federal government, national production is currently largely consisted of orange, apple, banana, pineapple, carambola, mango, and papaya fruits. [24][25][26] However, 30% of the estimated national fruit production goes unconsumed, in other words, approximately one third of the national fruit production is wasted or lost at the farm, retail, or consumer levels prior to consumption.…”