Model based on temperature parameters predicts optimal harvest date for ‘Whasan’ Asian pear

Seo, Ho-Jin; Chen, Po–An; Song, Jianzhong

doi:10.1007/s13580-020-00270-6

Cited by 5 publications

(3 citation statements)

References 23 publications

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“…All the cultivars exhibited a single sigmoid growth pattern for fruit development (Fig. 1B), as shown by 'Hwasan' Asian pear (Seo et al, 2020). The early-maturing cultivars, 'Wonhwang' and 'Whangkeumbae', showed a period of rapid fruit growth from 72 to 117 DAFB, consistent with an increase in AGR.…”

Section: Morphological Changes In Three Asian Pear Cultivars During F...mentioning

confidence: 60%

The Sucrose-to-Hexose Ratio is a Significant Determinant for Fruit Maturity and is Modulated by Invertase and Sucrose Re-Synthesis During Fruit Development and Ripening in Asian Pear (Pyrus pyrifolia Nakai) Cultivars

Lee¹,

Cho²,

Wi³

et al. 2021

HST

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This study investigated the regulatory mechanism controlling fruit maturity, focusing on sugar metabolism during pear fruit development and ripening. Three Asian pear cultivars, 'Wonhwang' (early-maturity), 'Whangkeumbae' (early-maturity), and 'Niitaka' (late-maturity), were selected. Absolute growth rate was the highest at 117 days after full bloom (DAFB) in early-maturing cultivars, 'Wonhwang' and 'Whangkeumbae', and at 147 DAFB in the late-maturing cultivar, 'Niitaka'. Hexose (glucose and fructose) content was relatively higher in 'Wonhwang' and 'Whangkeumbae' than in 'Niitaka' during the early stage of fruit development, concomitant with an increase in the activities of cell wall invertase (CWINV), vacuolar invertase (VINV), and neutral invertase (NINV). During the late stage of fruit development, sucrose content and the sucrose-to-hexose ratio were relatively higher in 'Wonhwang' and 'Whangkeumbae' than in 'Niitaka', accompanied by an increase of sucrose phosphate synthase (SPS) activity involved in sucrose re-synthesis. Principal component analysis (PCA) distinctly separated the fruit development into two parts, showing a shift in the early to late stage of fruit development, consistent with the point when the sucrose-to-hexose ratio began to increase. During the late stage of fruit development and ripening, the sucrose-to-hexose ratio was positively correlated with fresh weight, CWINV, and SPS activities and negatively correlated with starch or NINV and VINV activities. These results indicate that the sucrose-to-hexose ratio is an important factor in regulating fruit maturity and is modulated by invertases and SPS activities.

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Section: Morphological Changes In Three Asian Pear Cultivars During F...mentioning

confidence: 60%

The Sucrose-to-Hexose Ratio is a Significant Determinant for Fruit Maturity and is Modulated by Invertase and Sucrose Re-Synthesis During Fruit Development and Ripening in Asian Pear (Pyrus pyrifolia Nakai) Cultivars

Lee¹,

Cho²,

Wi³

et al. 2021

HST

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show abstract

“…The rebound height between Snow pear and contact material in Table 4 was substituted into Equations ( 4) and (5), and e x1 was 0.542, and e x2 was 0.652. The collision recovery coefficients were set as the above parameters in EDEM, the maximum simulated rebound height of Snow pear and contact materials were 143.71 mm and 145.87 mm, respectively, which were consistent with measured values.…”

Section: Crisp Pear Pvc Evamentioning

confidence: 99%

“…In recent years, with the increase in pear planting area, the yield has increased year by year [3,4]. Due to the short harvest period and strong harvest seasonality, harvesting machinery is necessary to improve the harvest efficiency of pears [5,6]. However, because pears' skin is thin and their meat is crisp and juicy, it is very easily damaged in the process of mechanized harvesting, which reduces the edible and storage properties of pears, and directly affects the quality and economic benefits of pears [7,8].…”

Section: Introductionmentioning

confidence: 99%

Simulation Parameter Calibration and Test of Typical Pear Varieties Based on Discrete Element Method

et al. 2022

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To improve the accuracy of discrete element simulation parameters for the mechanized picking and collection of pears, the study calibrated the simulation parameters of pears by the method of combining a physical experiment and simulation. Based on the intrinsic parameters of four kinds of pears (Snow pears, Crisp pears, Huangguan pears and Qiuyue pears), their simulation models were constructed by the Hertz-Mindlin with a bonding model. The simulation parameters between pears and the contact material (PVC, EVA foam material) were calibrated by the methods of free fall collision, inclined sliding and rolling, respectively. The experiments of pear accumulation angle were carried out. It was obtained to process the image of pears with Matrix Laboratory software. In order to determine the optimal value interval of influencing factors of the pear accumulation angle, the steepest ascent experiment was carried out. Considering the coefficient of collision recovery, the coefficient of static friction and the coefficient of rolling friction between pears, five-level simulation experiments of the pear accumulation angle were designed for each factor by the method of orthogonal rotation combination. The regression model of the error between the measured value and the simulated value of the pear accumulation angle was established, and the influence of three factors on the pear accumulation angle was analyzed. The results showed that the static friction coefficient and rolling friction coefficient between pears have significant effects on the pear accumulation angle. Therefore, the optimal model of minimum error was constructed according to constraint condition, and the coefficient of collision recovery, coefficient of static friction and coefficient of rolling friction between pears were obtained. The accumulation angle verification experiments were carried out by the method of bottomless barrel lifting. The results showed that the relative error between the simulated and measured accumulation angle of four kinds of pears were 1.42%, 1.68%, 2.19% and 1.83%, respectively, which indicated that the calibrated simulation parameters were reliable. The research can provide a basis for the design and parameters optimization of harvesting machinery of pears.

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Mechanisms driving fruit cracking in ‘Sinhwa’ pears (Pyrus pyrifolia Nakai) and effect of foliar fertilizer application on fruit quality

Seo,

Sawant,

Lee

et al. 2024

Scientia Horticulturae

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Model based on temperature parameters predicts optimal harvest date for ‘Whasan’ Asian pear

Cited by 5 publications

References 23 publications

The Sucrose-to-Hexose Ratio is a Significant Determinant for Fruit Maturity and is Modulated by Invertase and Sucrose Re-Synthesis During Fruit Development and Ripening in Asian Pear (Pyrus pyrifolia Nakai) Cultivars

The Sucrose-to-Hexose Ratio is a Significant Determinant for Fruit Maturity and is Modulated by Invertase and Sucrose Re-Synthesis During Fruit Development and Ripening in Asian Pear (Pyrus pyrifolia Nakai) Cultivars

Simulation Parameter Calibration and Test of Typical Pear Varieties Based on Discrete Element Method

Mechanisms driving fruit cracking in ‘Sinhwa’ pears (Pyrus pyrifolia Nakai) and effect of foliar fertilizer application on fruit quality

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