Relationship between canopy density and fruit quality of kiwifruit

Snelgar, W. P.; Hopkirk, G.; Seelye, R. J.; Martin, Philip; Manson, P. J.

doi:10.1080/01140671.1998.9514058

Cited by 33 publications

(11 citation statements)

References 20 publications

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“…The anti‐oxidant potential of Actinidia fruits was found to be largely influenced by vitamin C and total polyphenol levels, but also dependent on species and cultivars (Du et al ., ). The kiwifruit quality depends on several factors such as ripening time, genotype, cultivation techniques and environmental conditions (Kempler et al ., ; Snelgar et al ., ; Ferguson, ). The polyphenol content of kiwifruits was also influenced by light exposure, harvest time and storage conditions during the post‐harvest (Montanaro et al ., ; Tavarini et al ., ).…”

Section: Introductionmentioning

confidence: 99%

Characterisation of the Polyphenol Content in the Kiwifruit (Actinidia deliciosa) Exocarp for the Calibration of a Fruit‐sorting Optical Sensor

Pinelli

Romani

Fierini

et al. 2013

Phytochemical Analysis

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ABSTRACT:Introduction -Kiwifruit contains high amounts of anti-oxidants beneficial to health. Its quality is influenced by ripening time, genotype, cultivation techniques, climate and storage conditions after harvest. Objective -The aim of the present study was to characterise the phenolic content by HPLC methods and to evaluate the performance of a portable optical sensor (Multiplex 3), for in vivo non-destructive phenolic compound assessment in kiwifruits. Methods -Kiwifruits peel extracts were characterised by reverse-phase (RP) HPLC with diode-array detector (DAD) and electrospray ionisation (ESI) with MS using the Zorbax SB-Aq. column from Agilent. The fluorimetric sensor method is based on the screening of fruit chlorophyll fluorescence excitation and allows the UV absorbance of intact fruit skin to be measured. The flavonol index, FLAV, was calculated as log(FRF R /FRF UV ), where FRF R and FRF UV are the chlorophyll fluorescence excited with red and UV light. Results -Hydroxycinnamic acids, procyanidins, and quercetin glycosides were the main polyphenol classes detected by HPLC-DAD-ESI/MS in the kiwifruit skin. A good linear regression (R 2 = 0.88) was found between the fluorimetric sensor FLAV index and flavonol chromatographic analysis of the fruits. The FLAV index was able to detect the higher content of flavonols in sun-exposed fruits with respect to mid-shaded and shaded ones in accordance with the destructive analysis. Conclusion -The fluorimetric sensor represents a rapid and non-invasive tool to: (i) monitor the flavonol accumulation in kiwifruit and to assess its quality concerning the healthy anti-oxidant properties; (ii) evaluate the effect of environmental and agronomical factors related to the fruit quality; and (iii) select fruits with the largest flavonol content, and consequently less susceptible to pathogen attack, in order to improve their storage durability.

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Section: Introductionmentioning

confidence: 99%

Characterisation of the Polyphenol Content in the Kiwifruit (Actinidia deliciosa) Exocarp for the Calibration of a Fruit‐sorting Optical Sensor

Pinelli

Romani

Fierini

et al. 2013

Phytochemical Analysis

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“…Areas of dense canopy and high crop load near the trunk of vines may result in poor quality fruit. Studies of'Hayward' kiwifruit vines have shown that shading adversely affects both fruit size and quality (Grant & Ryugo 1984;Snelgar et al 1992Snelgar et al , 1998. If this is also true of A. chinensis cultivars, pruning techniques may have to be modified to reduce the number of canes in this region, thereby reducing canopy density and crop load.…”

Section: Vine Managementmentioning

confidence: 99%

Variation in flowering withinActinidia chinensisvines

Richardson¹,

Snelgar

Silva

et al. 2001

New Zealand Journal of Crop and Horticultural Science

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Variation in the time of flowering within vines of two Actinidia chinensis (Planch.) var. chinensis cultivars, 'Hortl6A' and '37-3-18A' ('18A'), is described. The flowering capacity of the two cultivars was very different, with 106 terminal flowers and 50 lateral flowers/m 2 of canopy on '18A' vines compared to only 39 terminal flowers/m 2 on 'Hortl6A' vines. However the variation within vines was similar. The most consistent systematic trend in the time of flowering was within canes, where time of flowering varied by up to 7 days. Shoots near the apex of the cane produced more flowers and they opened earlier than shoots near the cordon. Vines of both cultivars produced a large number of canes near the trunk and few at the end of cordons. However, time of flowering was not consistently affected by position on the cordon, cane size, or type of fruiting wood. On ' 18A' vines, lateral flowers formed a separate population, opening 4-5 days after terminal flowers, and should be monitored separately. Any sampling scheme developed from these data should H00018Received 10 July 2000; accepted 22 February 2001-take account of variation within canes. Vines should be managed to reduce variation in flowering date, which has been linked to unwanted variation in fruit maturity at harvest.

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“…In a study on the effect of canopy density on fruit quality the relationships between leaf area index and fruit size in Hayward cultivar was investigated. The results showed that the fruit size decreased as the crop load increased at a rate of 0.2 g/fruit/m 2 (SNELGAR et al , 1998. COOPER and MARSHALL (1992) also reported that leaf number/fruit ratio had a greater effect on fruit size than the crop load, and that the greatest fruit size and extra yield were obtained with 3:1 ratio.…”

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confidence: 92%

Effects of different bud loading levels on the yield, leaf and fruit characteristics of Hayward kiwifruit

Cangi¹,

Atalay²

2006

Hort. Sci. (Prague)

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ABSTRACT:The effects of different levels of bud loading on the yield and some leaf and fruit characteristics in Hayward cultivar (A. deliciosa) in the province of Ordu, Turkey were examined during two growing seasons in 2000-2001. Six years old kiwifruit vines were pruned to carry the loads of 120, 180, 240 or 300 buds/vine on the canes with 12 buds. The study determined probable total leaf area (PTLA), probable total leaf number (PTLN), probable total leaf weight (PTLW) and yield per vine. Mean fruit weight (MFW) and soluble solid contents (SSC, %) of fruits were expressed. In addition, unit leaf area/100 g fruit weight (ULA/FW) was calculated. Leaf characteristics were examined in 3 periods of the growing season. Correlations between yield, leaf and fruit characteristics and treatments were determined. The result of the experiment, namely mean leaf area (MLA), mean leaf weight (MLW), PTLA, PTLN, PTLW ranged between 185.51-194.17 cm 2 , 7.98-8.67 g, 21.047-58.61 m 2 /vine, 1,129.6-3,035.3 number/vine, 9.04-25.68 kg/vine, respectively. The mean yields of vines loaded with 120 and 300 buds were 34.84 and 100.96 kg/vine (12.19 and 35.34 ton/ha), respectively. Mean leaf area and mean leaf weight increased with increasing levels of bud loading, whereas MFW and ULA/FW decreased. There was a negative relationship between MFW, SSC and yield, and a positive relationship between MLA, PTLA and yield. ULA/FW ratio was between 581.88-611.54 cm 2 according to the bud loading level. Fruit size diminished as a consequence of dense canopies in both levels of bud loading (120 and 300 buds/vine). Unit leaf area per fruit weight ranged between 581.88-611.54 cm 2 /100 g, with respect to the bud loading applications. Increasing levels of bud loading resulted in reduced ULA/FW ratio and affected yield and some leaf and fruit characteristics.

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Relationship between canopy density and fruit quality of kiwifruit

Cited by 33 publications

References 20 publications

Characterisation of the Polyphenol Content in the Kiwifruit (Actinidia deliciosa) Exocarp for the Calibration of a Fruit‐sorting Optical Sensor

Characterisation of the Polyphenol Content in the Kiwifruit (Actinidia deliciosa) Exocarp for the Calibration of a Fruit‐sorting Optical Sensor

Variation in flowering withinActinidia chinensisvines

Effects of different bud loading levels on the yield, leaf and fruit characteristics of Hayward kiwifruit

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