scholarly journals Temperature-related changes in respiration and Q10 coefficient of Guava

2005 ◽  
Vol 62 (5) ◽  
pp. 458-463 ◽  
Author(s):  
Ilana Urbano Bron ◽  
Rafael Vasconcelos Ribeiro ◽  
Flávia Cristina Cavalini ◽  
Angelo Pedro Jacomino ◽  
Marcos José Trevisan
Keyword(s):  
Storage Temperature ◽  
Psidium Guajava ◽  
Maturity Stage ◽  
Stress Injury ◽  
Fruit Storage ◽  
Tropical Fruit ◽  
Q10 Value ◽  
Guava Fruit ◽  
Perishable Product ◽  
Dark Green

Guava (Psidium guajava L.) is a tropical fruit that presents fast post-harvest ripening; therefore it is a very perishable product. Inappropriate storage temperature and retail practices can accelerate fruit quality loss. The objective of this study was to evaluate the respiratory activity (RA), the ethylene production (EP) and Q10 of guava fruit at different storage temperatures. 'Paluma' guava fruits were harvested at maturity stage 1 (dark-green skin) and stored at either 1, 11, 21, 31 or 41ºC; RA and EP were determined after 12, 36, 84 and 156 h of storage. RA and EP rates at 1 and 11ºC were the lowest - 0.16 and 0.43 mmol CO2 kg-1 h-1 and 0.003 and 0.019 µmol C2H4 kg-1 h-1, respectively. When guavas were stored at 21ºC, a gradual increase occurred in RA and EP, reaching 2.24 mmol CO2 kg-1 h-1 and 0.20 µmol C2H4 kg-1 h-1, after 156 h of storage. The highest RA and EP were recorded for guavas stored at 31ºC. In spite of high RA, guavas stored at 41ºC presented EP similar to guavas stored at 11ºC, an indicator of heat-stress injury. Considering the 1-11ºC range, the mean Q10 value was around 3.0; the Q10 value almost duplicated at 11-21ºC range (5.9). At 21-31ºC and 31-41ºC, Q10 was 1.5 and 0.8, respectively. Knowing Q10, respiratory variation and ripening behavior in response to different temperatures, fruit storage and retail conditions can be optimized to reduce quality losses.

scholarly journals Ripening of "Pedro Sato" guava: study on its climacteric or non-climacteric nature

2005 ◽  
Vol 17 (3) ◽  
pp. 299-306 ◽  
Author(s):  
Marisa Azzolini ◽  
Angelo Pedro Jacomino ◽  
Ilana Urbano Bron ◽  
Ricardo Alfredo Kluge ◽  
Marlene Aparecida Schiavinato
Keyword(s):  
Respiratory Rate ◽  
Ethylene Production ◽  
Room Temperature ◽  
Psidium Guajava ◽  
Maturity Stage ◽  
Physiological Basis ◽  
Tropical Fruit ◽  
Maturity Stages ◽  
Climacteric Fruit ◽  
Light Green

Guava (Psidium guajava L.) is a tropical fruit exhibiting rapid post-harvest ripening. However, the physiological basis involved in the ripening process of guava is not totally clear, which makes it difficult to develop technologies to enhance fruit storability. Two experiments were carried out with the objective of determining the ripening behavior of 'Pedro Sato' guavas. In the first experiment, guava fruits at three maturity stages (I - dark green, II - light green and III - yellow-green) were stored at room temperature (23 ± 1°C and 85 ± 5 % RH). The respiratory rate, ethylene production, pulp and skin colours, and firmness were evaluated. In the second experiment, ethylene and 1-methylcyclopropene (1-MCP) were applied to guavas at the light green maturity stage and the ripening behaviour during storage at room temperature was studied. Fruits from all maturity stages showed a gradual increase in the respiratory rate and ethylene production. The intense changes in pulp and skin colours and in firmness preceded the maximum respiratory rate and ethylene production. 1-MCP reduced the rate of ripening, while the application of ethylene did not promote this process. These results do not permit the classification of 'Pedro Sato' guava as a traditional climacteric fruit.

scholarly journals First Report of Lasiodiplodia theobromae Causing Postharvest Fruit Rot on Guava (Psidium guajava) in Malaysia

Plant Disease ◽  
2021 ◽  
Author(s):  
Kar Yan Zee ◽  
Norhayu Asib ◽  
Siti Izera Ismail
Keyword(s):  
Morphological Characteristics ◽  
Its Region ◽  
Psidium Guajava ◽  
Fruit Rot ◽  
Pathogenicity Test ◽  
Tropical Fruit ◽  
Lasiodiplodia Theobromae ◽  
First Report ◽  
Guava Fruit ◽  
Initial Symptoms

Guava (Psidium guajava L.) is an economically important tropical fruit crop and is cultivated extensively in Malaysia. In September and October 2019, postharvest fruit rot symptoms were observed on 30% to 40% of guava fruit cv. Kampuchea in fruit markets of Puchong and Ipoh cities in the states of Selangor and Perak, Malaysia. Initial symptoms appeared as brown, irregular, water-soaked lesions on the upper portion of the fruit where it was attached to the peduncle. Subsequently, lesions then progressed to cover the whole fruit (Fig.1A). Lesions were covered with an abundance of black pycnidia and grayish mycelium. Ten symptomatic guava fruit were randomly collected from two local markets for our investigation. For fungal isolation, small fragments (5×5 mm) were excised from the lesion margin, surface sterilized with 0.5% NaOCl for 2 min, rinsed three times with sterile distilled water, placed on potato dextrose agar (PDA) and incubated at 25 °C with 12-h photoperiod for 2-3 days. Eight single-spore isolates with similar morphological characteristics were obtained and two representative isolates (P8 and S9) were characterized in depth. Colonies on PDA were initially composed of grayish-white aerial mycelium, but turned dark-gray after 7 days (Fig. 1B). Abundant black pycnidia were observed after incubation for 4 weeks. Immature conidia were hyaline, aseptate, ellipsoid, thick-walled, and mature conidia becoming dark brown and 1-septate with longitudinal striations, 25.0 − 27.0 ± 2.5 × 13.0 − 14.0 ± 1.0 μm (n = 30) (Fig.1C, D). On the basis of morphology, both representative isolates were identified as Lasiodiplodia theobromae (Pat.) Griffon & Maubl. (Alves et al. 2008). For molecular identification, genomic DNA of the two isolates was extracted using the DNeasy plant mini kit (Qiagen, USA). The internal transcribed spacer (ITS) region of rDNA and translation elongation factor 1-alpha (EF1-α) genes were amplified using ITS5/ITS4 and EF1-728F/EF1-986R primer set, respectively (White et al. 1990, Carbone and Kohn 1999). BLASTn analysis of the resulting ITS and EF1-α sequences indicated 100% identity to L. theobromae ex-type strain CBS 164.96 (GenBank accession nos: AY640255 and AY640258, respectively) (Phillips et al. 2013). The ITS (MW380428, MW380429) and EF1-α (MW387153, MW387154) sequences were deposited in GenBank. Phylogenetic analysis using the maximum likelihood based on the combined ITS-TEF sequences indicated that the isolates formed a strongly supported clade (100% bootstrap value) to the related L. theobromae (Kumar et al. 2016) (Fig.2). A pathogenicity test of two isolates was conducted on six healthy detached guava fruits per isolate. The fruit were surface sterilized using 70% ethanol and rinsed twice with sterile water prior inoculation. The fruit were wound-inoculated using a sterile needle according to the method of de Oliveira et al. (2014) and five-mm-diameter mycelial agar plugs from 7-days-old PDA culture of the isolates were placed onto the wounds. Six additional fruit were wound inoculated using sterile 5-mm-diameter PDA agar plugs to serve as controls. Inoculated fruit were placed in sterilized plastic container and incubated in a growth chamber at 25 ± 1 °C, 90% relative humidity with a photoperiod of 12-h. The experiment was conducted twice. Five days after inoculation, symptoms as described above developed on the inoculated sites and caused a fruit rot, while control treatment remained asymptomatic. L. theobromae was reisolated from all symptomatic tissues and confirmed by morphological characteristics and confirmed by PCR using ITS region. L. theobromae has recently been reported to cause fruit rot on rockmelon in Thailand (Suwannarach et al. 2020). To our knowledge, this is the first report of L. theobromae causing postharvest fruit rot on guava in Malaysia. The occurrence of this disease needs to be monitored as this disease can reduce the marketable yield of guava. Preventive strategies need to be developed in the field to reduce postharvest losses.

Guava (Psidium guajava L.) Fruit Coating with Gum – Arabic for Quality and Fruit Fly Control

1970 ◽  
pp. 01-04
Author(s):  
Esameldin B. M. Kabbashi, Ghada H. Abdelrahman and Nawal A. Abdlerahman
Keyword(s):  
Shelf Life ◽  
Gum Arabic ◽  
Fruit Fly ◽  
Psidium Guajava ◽  
Postharvest Quality ◽  
Guava Fruit ◽  
Fruit Shelf Life ◽  
Fly Control ◽  
And Control ◽  
Subtropical Fruit

Guava (Psidium guajava L.) is a lovely tropical and subtropical fruit that originates in Mexico, Central America, and then taken to other distant and near parts around the world. In Sudan this popular fruit is produced in orchards and household and is so profitable but yet attacked by a lot of fruit fly species of the Genera Ceratitis and Bactrocera and the result is a loss of more than 70%. This research aimed at evaluating the effect of Gum Arabic coating (GAC) in extending the shelf life of guava fruit and disinfesting it from these notorious pests. Guava fruits from Kadaro orchards, Khartoum North, were tested using seven concentrations of Gum Arabic solutions. The results reflect that 1: 4 (25%) and 1: 8 (12.5%) (GA: water) concentrations attained 56 and 40% disinfestation, respectively whereas the other lower concentrations effected corresponding results in a range from 20 – 08%. The reduction in maggots per test fruit reached upto 188% as compared to the control.  The highest concentrations (1: 4 & 1: 8) effected a sustainability of 52% in fruit firmness (FF) with an average of medium (3) FF compared to soft FF (4) in the control. The corresponding results in other lower concentrations (1: 16; 1: 32; 1: 64; 1: 72 & 1: 96) were 36, 24, 24, 20 and 16%, respectively. In addition to an average FF of 4 (soft) for all these concentrations and 5 (very soft) for all the corresponding controls. Nevertheless, the sustainability of fruit color (FC) effected by the test concentrations was 52, 44, 24, 22, 24, 20, and 24%, respectively. Regarding these results, the two highest test concentrations effected a sizeable disinfestation and control of fruit flies and a good extension of shelf life of guava in Khartoum State. These findings support using this treatment as an effective IPM tool to extend guava fruit shelf life and upgrading its postharvest quality.

scholarly journals Histopathology of Colletotrichum gloeosporioides on guava fruits (Psidium guajava L.)

2013 ◽  
Vol 35 (2) ◽  
pp. 657-664 ◽  
Author(s):  
Sylvia Raquel Gomes Moraes ◽  
Francisco André Osama Tanaka ◽  
Nelson Sidnei Massola Júnior
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Colletotrichum Gloeosporioides ◽  
Psidium Guajava ◽  
Mature Stage ◽  
Guava Fruit ◽  
Transmission Electron ◽  
Colonization Process ◽  
Parenchymal Cells ◽  
Appressoria Formation

Anthracnose, caused by Colletotrichum gloeosporioides, produces brown lesions on guava fruits, causing severe losses on postharvest. In this study, the infection and colonization of guava fruits by C. gloeosporioides has been examined using scanning and transmission electron microscopy. Fruits at the physiologically mature stage were inoculated with a 10(5) conidia/mL spore suspension. Afterward, fruits were incubated at 25 °C in a wet chamber for periods of 6, 12, 24, 48, 96 and 120 h to allow examination of the infection and colonization process. Conidia germination and appressoria formation occurred six hours after inoculation (h.a.i). Penetration occurred directly via penetration pegs from appressoria, which penetrated the host cuticle 48 h.a.i. Notably, the appressoria did not produce an appressorial cone surrounding the penetration pore. Infection vesicles were found in epidermal cells 96 h.a.i. The same fungal structures were found in epidermal and parenchymal cells of the host 120 h.a.i. Colonization strategy of C. gloeosporioides on guava fruit was intracellular hemibiotrophic.

scholarly journals First Report of Guignardia psidii, an Ascigerous State of Phyllosticta psidiicola, Causing Fruit Rot on Guava in Venezuela

Plant Disease ◽  
2005 ◽  
Vol 89 (7) ◽  
pp. 773-773 ◽  
Author(s):  
M. S. González ◽  
A. Rondón
Keyword(s):  
Psidium Guajava ◽  
Potato Dextrose Agar ◽  
Fruit Rot ◽  
Symptom Development ◽  
First Report ◽  
Guava Fruit ◽  
Pathogenicity Tests ◽  
Apical Appendage ◽  
Ascigerous State ◽  
Gelatinous Envelope

During August 2003, guava fruit (Psidium guajava L.) cv. Red Dominicana from Cojedes state in Venezuela showed circular, purple-to-brown lesions (0.5 to 1.0 cm) that spread over all surfaces and became black and shrunken on severely affected fruit. Symptomatic tissues were plated aseptically on potato dextrose agar (PDA). Colonies that were initially gray and turned black with age were consistently isolated. The fungus was characterized by dense, submerged, brown-to-black mycelium with septate hyphae. Ascocarps were perithecial, abundant, granulose, subglobose to cylindric obpyriform, solitary or aggregated, mostly unilocular with prominent long necks; ascocarp walls were stromatic, composed of several layers of cells, thick walled, and deeply pigmented on the outside. Asci were subclavate to cylindrical, stipitate, 44 to 84 × 7 to 9 μm, and eight-spored; asci walls were thick and bitunicate. Ascospores were unicellular, hyaline, guttulate, fusiform ellipsoid, widest in the mid-region with rounded ends and gelatinous plugs, and 12 to 17 × 4.5 μm. Conidiomata were pycnidial, intermixed among ascocarps, variable in shape, dark brown, solitary or aggregated, ostiolate, and with long necks up to 1 mm. Pycnidial walls were pseudoparenchymatic, multicellular, and composed of many layers of brown compressed cells. Conidiogenous cells were hyaline, subglobose to cylindrical, and smooth, and holoblastic. Conidia were hyaline, unicellular, obovate, 6 to 12 (7.5) × 5 to 8 μm, slightly truncate at the bases, rounded at apices, guttulate, and provided a gelatinous envelope and apical appendage. Appendages were hyaline, tubular, smooth, and 3.0 to 4.5 × 0.5 μm. The fungus is homothallic because single ascospores and single conidia developed ascigerous states. The ascigerous state was identified as Guignardia psidii (1) and the anamorph as Phyllosticta psidiicola (1,2). Pathogenicity tests were conducted on detached fruits inoculated with monosporic cultures. Pathogenesis and symptom development only occurred when a mixture of mycelium, ascospores, and conidia was used as inoculum. The fungus was reisolated from symptomatic fruit tissues. To our knowledge, this is the first report of Guignardia psidii, an ascigerous state of Phyllosticta psidiicola from guava fruits in Venezuela. References: (1) B. A. Ullasa and R. D. Rawal. Curr. Sci. 53:435, 1984. (2) H. A. van der Aa. Page 95 in: No. 5, Stud. Mycol., 1973.

scholarly journals Post-harvest quality of Campomanesia adamantium (Cambess.) O. Berg. in function of storage temperature

2020 ◽  
Vol 43 ◽  
pp. e48979
Author(s):  
Marília Assis do Santos ◽  
Alan Carlos Costa ◽  
Clarice Aparecida Megguer ◽  
Júlien da Silva Lima ◽  
Yasmin Giovanna Santos Carvalho ◽  
...  
Keyword(s):  
Visual Analysis ◽  
Storage Temperature ◽  
Titratable Acidity ◽  
Soluble Solids ◽  
Maturity Stage ◽  
Post Harvest ◽  
Fruit Species ◽  
Randomized Design ◽  
Soluble Solid

Brazil has a large variety of native and exotic fruit species, including the gabiroba, which can be sources of income for the population. The objective of this study was to evaluate the post-harvest behavior of gabiroba fruit by maturity stage and storage temperature. The fruits were divided into two lots and stored at temperatures of 6, 12, 24 and 30°C. The first batch was used for the physical and chemical analysis of acidity, soluble solids, firmness, percentage of green color, and visual analysis; this batch was composed of green and yellow-green fruit. The second lot was intended for breath analysis, composed of green, yellow-green, and yellow fruits. The experiment was conducted in a completely randomized design with five replications. Data were analyzed using descriptive statistics. Considering the evaluated characteristics, the gabiroba soluble solid/titratable acidity ratio values should be approximately 4.0 for the fruits to be considered acceptable for consumption. For the preservation of the post-harvest quality of gabiroba, it is indicated that the harvest is carried out at the green stage of maturation and that they are stored at a temperature of 6°C. The highest respiratory rates were observed in fruits harvested at the yellow stage, not being recommended its storage.

scholarly journals Peramalan Volume Penjualan Buah Jambu Biji Merah (Psidium Guajava Linn.) di CV Moena Abadi Sejahtera 1

2017 ◽  
Author(s):  
IDA AYU PREMAYANTI ◽  
I WAYAN WIDYANTARA ◽  
RATNA KOMALA DEWI
Keyword(s):  
Citrus Fruit ◽  
Psidium Guajava ◽  
Coefficient Of Determination ◽  
Sales Volume ◽  
Model Function ◽  
Function Model ◽  
Independent Variables ◽  
Guava Fruit ◽  
Forecasting Method ◽  
Exponential Trend

Sales Volume Forecasting Red Guava Fruit (Psidium Guajava Linn.)in CV Moena Abadi Sejahtera 1This study aims to determine the factors that affect the sales volume of fruit Guava Red and estimating sales volume Guava fruit Red 2016, 2017, and 2018 in CV Moena Abadi Sejahtera 1. The data were taken within the last six years the year 2010 until 2015. this study used two models of the sales function is a linear function of sales and sales functions are transformed into a form logharitma tested with three criteria to get the best sales function model. The independent variables that affect the price of fruit Guava Red (PJBM), the price of fruit Bark (PSB), the price of fruit Ambon Banana (PPA), the price fruit Lumajang Oranges (PJL), and the price fruits Kintamani oranges (PJK). Sales function model which is transformed into the shape of a model function logharitma valid sales are LogQJBM = -7.267 - 0,227 log PJBM + 1,798 log PSB - 0,102 log PPA + 0,136 log PJL + 0,379 log PJK ± e. Factors that influence is Red Guava fruit prices, the price of fruit Salak Bali, Lumajang Citrus fruit prices, and the price Citrus fruits Kintamani. Estimated sales of Red Guava fruit using trend analysis and multiple linear regression to see the value of the coefficient of determination (R2), the largest and the value of the standard error (SE), the smallest so get the best forecasting method. Methods exponential trend is the best forecasting method is Y = 502.34 + 1.0023 t ± e. The estimation results of the Red Guava fruit sales in 2016, 2017, and 2018 continue to rise. CV Moena Abadi Sejahtera 1 should use a forecasting method to maintain the availability of the fruit in the store, especially the Red Guava fruit.

scholarly journals Real-Time Monitoring System for Shelf Life Estimation of Fruit and Vegetables

Sensors ◽  
2020 ◽  
Vol 20 (7) ◽  
pp. 1860 ◽  
Author(s):  
Roque Torres-Sánchez ◽  
María Teresa Martínez-Zafra ◽  
Noelia Castillejo ◽  
Antonio Guillamón-Frutos ◽  
Francisco Artés-Hernández
Keyword(s):  
Environmental Factors ◽  
Shelf Life ◽  
Real Time ◽  
Monitoring System ◽  
Rating Scales ◽  
Storage Temperature ◽  
Postharvest Quality ◽  
Real Time Monitoring ◽  
Perishable Product

The control of the main environmental factors that influence the quality of perishable products is one of the main challenges of the food industry. Temperature is the main factor affecting quality, but other factors like relative humidity and gas concentrations (mainly C2H4, O2 and CO2) also play an important role in maintaining the postharvest quality of horticultural products. For this reason, monitoring such environmental factors is a key procedure to assure quality throughout shelf life and evaluate losses. Therefore, in order to estimate the quality losses that a perishable product can suffer during storage and transportation, a real-time monitoring system has been developed. This system can be used in all post-harvest steps thanks to its Wi-Fi wireless communication architecture. Several laboratory trials were conducted, using lettuce as a model, to determine quality-rating scales during shelf life under different storage temperature conditions. As a result, a multiple non-linear regression (MNLR) model is proposed relating the temperature and the maximum shelf life. This proposed model would allow to predict the days the commodities will reduce their theoretical shelf-life when an improper temperature during storage or in-transit occurs. The system, developed as a sensor-based tool, has been tested during several land transportation trips around Europe.

Sign in / Sign up

Export Citation Format

Share Document