Evaluation of Training Systems for Nashi Pears

Petri, José Luiz; Leite, Gabriel Berenhauser; Basso, Cláudia; Hawerrth, F.J.

doi:10.17660/actahortic.2008.800.103

Cited by 2 publications

(6 citation statements)

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“…In the presented study, the highest yields over the period of eight years following the orchard establishment were obtained from the 'Chojuro' and 'Shinseiki' cultivars, whereas the Japanese 'Nijisseiki' gave the smallest crop. This pattern is in agreement with the findings reported by Larsen and Higgins [1998], Petri et al [2008], and Bielicki et al [2009]. In contrast, Buler et al [2008] observed higher yields in case of 'Nijisseiki' than 'Chojuro'.…”

Section: Resultssupporting

confidence: 92%

“…In contrast, Buler et al [2008] observed higher yields in case of 'Nijisseiki' than 'Chojuro'. Similarly, the poor yields obtained from the 'Hosui' cultivar do not agree with earlier findings by Petri et al [2008] and Pitera et al [2010]. Such small amounts of fruits were collected by [Tabakov et al 2002] in the conditions of Bulgaria.…”

Section: Resultsmentioning

confidence: 58%

“…For instance, 'Nijisseiki' needs more than 700 hours, whereas for 'Kosui', 400 hours suffice [Faoro and Nakasu 2002]. Some of the Asian pears, such as 'Hosui' and 'Kosui', are sensitive to fire blight (Erwinia amylovora) and other bark and wood diseasesespecially in conditions of a humid climate [Griggs and Iwakiri 1977, Petri et al 2008, Walsh et al 2015, 2016. On the other hand, they exhibit a high degree of resistance towards pear scab (Venturia pirina) [Villalta et al 2005, Pitera et al 2010.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of Several Asian Pear Cultivars in the Climatic Conditions of Lower Silesia

Sosna

2018

Acta Sci.Pol.Hortorum Cultus

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The Asian pear tree (Nashi), originated in China and Japan, where it is commonly grown. In Europe, in Poland in particular, it remains almost unknown, despite the fact that its cultivation has been proven to be possible there. The aim of the experiment-carried out between 2008 and 2015 at the Fruit Experimental Station Samotwór, next to Wrocław-was to evaluate the growth intensity and yielding of several Asian pear tree cultivars: 'Kosui', 'Shinseiki', 'Nijisseiki', 'Chojuro', 'Hosui', and 'Shu Li'; as well as the quality and biological value of their fruits. 'Conference', which is widespread in Europe, was chosen as the control variety. 'Conference', 'Shu Li', and 'Hosui' showed highest growth intensity, whereas the trees of 'Shinseiki' were the smallest. In terms of yields over the period of eight years following the planting, 'Chojuro' and 'Shinseiki' performed best, while the least fruits were obtained from the 'Nijisseiki' cultivar. Significantly heaviest and biggest fruits were collected from the Chinese 'Shu Li' cultivar. In 2012, Nashi fruits had similar carotenoid, calcium, and magnesium contents as the fruits of 'Conference'.

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Section: Resultssupporting

confidence: 92%

Section: Resultsmentioning

confidence: 58%

Section: Introductionmentioning

confidence: 99%

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Evaluation of Several Asian Pear Cultivars in the Climatic Conditions of Lower Silesia

Sosna

2018

Acta Sci.Pol.Hortorum Cultus

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“…In China, free systems, such as spindle and open vase, are widely employed in most pear orchards because of their low costs and high early yields. However, fruit may bruise easily and reduce marketability when the branches are not firmly attached to supports [ 5 ]. At the intra-tree scale of traditional training systems, fruit quality may show a large variability in response to architectural position, since uneven distribution of light within the canopy is associated with shade [ 6 , 7 ].…”

Section: Introductionmentioning

confidence: 99%

“…The training system is based on the removal of water shoots above the trunk or primary branches and tying the lateral shoots with string to the trellis. This arrangement allows trees to receive sunlight uniformly and achieve uniform fruiting and fruit quality, not to mention lower labor costs and its capability to protect fruit trees from wind [ 5 ]. In addition, this system increases the shoot angle from the vertical to the horizontal position, which can promote flower bud formation and fruit set [ 8 ].…”

Section: Introductionmentioning

confidence: 99%

Selection and validation of suitable reference genes for qRT-PCR analysis in pear leaf tissues under distinct training systems

et al. 2018

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Training systems generally alter tree architecture, which modulates light microclimate within the canopy, for the purpose of improving photosynthetic efficiency and fruit quality. Gene expression quantification is one of the most important methods for exploring the molecular mechanisms underlying the influence of training systems on pear photosynthesis, and suitable reference genes for gene expression normalization are a prerequisite for this method. In this study, the expression stability of nine common and four novel candidate genes were evaluated in 14 different pear leaf samples in two training systems, including those at four developmental stages (training_period) and from different parts of the trees (training_space), using two distinct algorithms, geNorm and NormFinder. Our results revealed that SKD1 (Suppressor of K+ Transport Growth Defect1)/ YLS8 (Yellow Leaf Specific 8) and ARM (Armadillo) were the most stable single reference genes for the ‘training_period’ and ‘training_space’ subsets, respectively, although these single genes were not as stable as the optimal pairs of reference genes, SKD1+YLS8 and ARM+YLS8, respectively. Furthermore, the expression levels of the PpsAPX (Ascorbate peroxidase) gene showed that the arbitrary use of reference genes without previous testing could lead to misinterpretation of data. This work constitutes the first systematic analysis regarding the selection of superior reference genes in training system studies, facilitating the elucidation of gene function in pear and providing valuable information for similar studies in other higher plants.

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Evaluation of Training Systems for Nashi Pears

Cited by 2 publications

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Evaluation of Several Asian Pear Cultivars in the Climatic Conditions of Lower Silesia

Evaluation of Several Asian Pear Cultivars in the Climatic Conditions of Lower Silesia

Selection and validation of suitable reference genes for qRT-PCR analysis in pear leaf tissues under distinct training systems

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