Identification of Causal Factors of Peel-Pulp Splitting and Peeling Difficulty Disorders in ‘Mas’ Banana [Musa Sapientum Cv. Mas (Aa)]

‘Mas’ banana is among the most favoured of all the local dessert bananas because of its fascinating golden peel and light orange, aromatic and sweet pulp. However, this dessert cultivar was found to be susceptible to peel-pulp splitting disorder (PPSD) and peeling difficulty disorders (PDD). Thus...

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Main Author:	Wo, Soek Meng
Format:	Thesis
Language:	English English
Published:	2007
Subjects:	Bananas - Diseases and pests
Online Access:	http://psasir.upm.edu.my/id/eprint/5296/1/FSTM_2007_2.pdf
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spelling	my-upm-ir.52962013-05-27T07:21:47Z Identification of Causal Factors of Peel-Pulp Splitting and Peeling Difficulty Disorders in ‘Mas’ Banana [Musa Sapientum Cv. Mas (Aa)] 2007 Wo, Soek Meng ‘Mas’ banana is among the most favoured of all the local dessert bananas because of its fascinating golden peel and light orange, aromatic and sweet pulp. However, this dessert cultivar was found to be susceptible to peel-pulp splitting disorder (PPSD) and peeling difficulty disorders (PDD). Thus, study was conducted to identify the causal factors of PPSD and PDD of Mas banana during fruit development and ripening, respectively. Incidence of PPSD and the physical characteristics of the fruits were determined at harvest dates of 4, 5, 6, 7, 8 and 9 weeks after flower emergence (WAFE) for three fruiting seasons (FS1, FS2 and FS3). Chemical characteristics and nutrient contents in PPSD and normal fruits harvested at 6, 7, 8 and 9 WAFE were determined. The anatomical characteristics of the PPSD and normal fruits were also studied. Incidence of PPSD was found to be the most severe at FS3 which was a rainy season after a drought season. Incidence of PPSD was significantly (P≤0.05) and positively correlated to fruit circumference, pulp weight and pulp to peel ratio. This suggested that the increase in fruit splitting was related to a rapid increase in fruit size. Significant (P≤0.05) increases in pulp moisture content and significantly (P≤0.05) higher peel moisture content of PPSD fruits suggested that rapid increase in pulp volume had put stress on the peel and caused the fruit to split. Significantly lower peel calcium in PPSD fruits also suggested that PPSD was a Ca-deficiency disorder which had caused a lower cell wall turgidity and intercellular strength in the fruits. Results obtained for soluble solids concentration, titratable acidity and pH of the fruits indicated that the fruits had achieved harvest maturity at 6 to 7 WAFE. As shown in the scanning electron micrographs (SEM), the intercellular space of PPSD fruits had been fully occupied due to the rapid cell expansion, imposing stress on the peel which rendered the fruit to split. Occurrence of PDD was determined on fruits ripened at three levels of RH (high – 90 ± 5%, medium – 70 ± 5 %, low – 50 ± 5 %) during 5 to 8 ripening days. The corresponding quality and anatomical characteristics of the fruits in relation to PDD were also determined. Fruits ripened at low and medium RH conditions manifested PDD. There was an advanced ripening in fruits ripened at low RH as compared to fruits ripened at medium and high RH. This was shown by the significant (P≤0.05) linear and quadratic relationships between peel colour (L* and C*) and ripening day. Occurrence of PDD was significantly (P≤0.05) and positively correlated to weight loss and sugar: acid, but was negatively correlated to peel thickness and peel moisture content. These indicated that PDD increased with an increase in moisture loss when ripened at RH lower than 70%. SEM showed that severe water loss in fruits caused the cells to contract and loss turgor, resulting in loss of cell wall turgidity and reduced intercellular spaces. Thus, peelpulp transition layer was not readily separated from the outermost layer of the pulp because of absence of intercellular spaces to facilitate peeling. Bananas - Diseases and pests 2007 Thesis http://psasir.upm.edu.my/id/eprint/5296/ http://psasir.upm.edu.my/id/eprint/5296/1/FSTM_2007_2.pdf application/pdf en public masters Universiti Putra Malaysia Bananas - Diseases and pests Food Science and Technology English
institution	Universiti Putra Malaysia
collection	PSAS Institutional Repository
language	English English
topic	Bananas - Diseases and pests
spellingShingle	Bananas - Diseases and pests Wo, Soek Meng Identification of Causal Factors of Peel-Pulp Splitting and Peeling Difficulty Disorders in ‘Mas’ Banana [Musa Sapientum Cv. Mas (Aa)]
description	‘Mas’ banana is among the most favoured of all the local dessert bananas because of its fascinating golden peel and light orange, aromatic and sweet pulp. However, this dessert cultivar was found to be susceptible to peel-pulp splitting disorder (PPSD) and peeling difficulty disorders (PDD). Thus, study was conducted to identify the causal factors of PPSD and PDD of Mas banana during fruit development and ripening, respectively. Incidence of PPSD and the physical characteristics of the fruits were determined at harvest dates of 4, 5, 6, 7, 8 and 9 weeks after flower emergence (WAFE) for three fruiting seasons (FS1, FS2 and FS3). Chemical characteristics and nutrient contents in PPSD and normal fruits harvested at 6, 7, 8 and 9 WAFE were determined. The anatomical characteristics of the PPSD and normal fruits were also studied. Incidence of PPSD was found to be the most severe at FS3 which was a rainy season after a drought season. Incidence of PPSD was significantly (P≤0.05) and positively correlated to fruit circumference, pulp weight and pulp to peel ratio. This suggested that the increase in fruit splitting was related to a rapid increase in fruit size. Significant (P≤0.05) increases in pulp moisture content and significantly (P≤0.05) higher peel moisture content of PPSD fruits suggested that rapid increase in pulp volume had put stress on the peel and caused the fruit to split. Significantly lower peel calcium in PPSD fruits also suggested that PPSD was a Ca-deficiency disorder which had caused a lower cell wall turgidity and intercellular strength in the fruits. Results obtained for soluble solids concentration, titratable acidity and pH of the fruits indicated that the fruits had achieved harvest maturity at 6 to 7 WAFE. As shown in the scanning electron micrographs (SEM), the intercellular space of PPSD fruits had been fully occupied due to the rapid cell expansion, imposing stress on the peel which rendered the fruit to split. Occurrence of PDD was determined on fruits ripened at three levels of RH (high – 90 ± 5%, medium – 70 ± 5 %, low – 50 ± 5 %) during 5 to 8 ripening days. The corresponding quality and anatomical characteristics of the fruits in relation to PDD were also determined. Fruits ripened at low and medium RH conditions manifested PDD. There was an advanced ripening in fruits ripened at low RH as compared to fruits ripened at medium and high RH. This was shown by the significant (P≤0.05) linear and quadratic relationships between peel colour (L* and C*) and ripening day. Occurrence of PDD was significantly (P≤0.05) and positively correlated to weight loss and sugar: acid, but was negatively correlated to peel thickness and peel moisture content. These indicated that PDD increased with an increase in moisture loss when ripened at RH lower than 70%. SEM showed that severe water loss in fruits caused the cells to contract and loss turgor, resulting in loss of cell wall turgidity and reduced intercellular spaces. Thus, peelpulp transition layer was not readily separated from the outermost layer of the pulp because of absence of intercellular spaces to facilitate peeling.
format	Thesis
qualification_level	Master's degree
author	Wo, Soek Meng
author_facet	Wo, Soek Meng
author_sort	Wo, Soek Meng
title	Identification of Causal Factors of Peel-Pulp Splitting and Peeling Difficulty Disorders in ‘Mas’ Banana [Musa Sapientum Cv. Mas (Aa)]
title_short	Identification of Causal Factors of Peel-Pulp Splitting and Peeling Difficulty Disorders in ‘Mas’ Banana [Musa Sapientum Cv. Mas (Aa)]
title_full	Identification of Causal Factors of Peel-Pulp Splitting and Peeling Difficulty Disorders in ‘Mas’ Banana [Musa Sapientum Cv. Mas (Aa)]
title_fullStr	Identification of Causal Factors of Peel-Pulp Splitting and Peeling Difficulty Disorders in ‘Mas’ Banana [Musa Sapientum Cv. Mas (Aa)]
title_full_unstemmed	Identification of Causal Factors of Peel-Pulp Splitting and Peeling Difficulty Disorders in ‘Mas’ Banana [Musa Sapientum Cv. Mas (Aa)]
title_sort	identification of causal factors of peel-pulp splitting and peeling difficulty disorders in ‘mas’ banana [musa sapientum cv. mas (aa)]
granting_institution	Universiti Putra Malaysia
granting_department	Food Science and Technology
publishDate	2007
url	http://psasir.upm.edu.my/id/eprint/5296/1/FSTM_2007_2.pdf
_version_	1747810393692045312

Identification of Causal Factors of Peel-Pulp Splitting and Peeling Difficulty Disorders in ‘Mas’ Banana [Musa Sapientum Cv. Mas (Aa)]

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