Certain Physiological and Biochemical Changes in Greenhouse‐Grown Tomatoes (Lycopersicon Esculentum Mill.)

Dalal, K. B.; Salunkhe, D. K.; Olson, L. E.

doi:10.1111/j.1365-2621.1966.tb01889.x

Cited by 11 publications

(3 citation statements)

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“…Thus, citrate is present in quantities potentially able to displace all pectin‐bound Ca 2+ . Citrate and malate concentrations increase during ripening (Dalal et al ., 1966; Islam et al ., 1996), compatible with a role in softening. Such a role is supported by the observation that pectin solubilization in disks of unripe tomato pericarp is inhibited by added Ca 2+ (Mingani et al ., 1995).…”

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confidence: 99%

Primary cell wall metabolism: tracking the careers of wall polymers in living plant cells

2004

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Contents Primary cell walls: composition, deposition and roles000 Reactions that have been proposed to occur in primary cell walls000 Tracking the careers of wall components in vivo: evidence for action of enzymes in the walls of living plant cells000 Evidence for the occurrence of nonenzymic polymer scission in vivo?000 Conclusion000 Summary Numerous examples have been presented of enzyme activities, assayed in vitro, that appear relevant to the synthesis of structural polysaccharides, and to their assembly and subsequent degradation in the primary cell walls (PCWs) of higher plants. The accumulation of the corresponding mRNAs, and of the (immunologically recognized) proteins, has often also (or instead) been reported. However, the presence of these mRNAs, antigens and enzymic activities has rarely been shown to correspond to enzyme action in the living plant cell. In some cases, apparent enzymic action is observed in vivo for which no enzyme activity can be detected in in‐vitro assays; the converse also occurs. Methods are reviewed by which reactions involving structural wall polysaccharides can be tracked in vivo. Special attention is given to xyloglucan endotransglucosylase (XET), one of the two enzymic activities exhibited in vitro by xyloglucan endotransglucosylase/hydrolase (XTH) proteins, because of its probable importance in the construction and restructuring of the PCW's major hemicellulose. Attention is also given to the possibility that some reactions observed in the PCW in vivo are not directly enzymic, possibly involving the action of hydroxyl radicals. It is concluded that some proposed wall enzymes, for example XTHs, do act in vivo, but that for other enzymes this is not proven.

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confidence: 99%

Primary cell wall metabolism: tracking the careers of wall polymers in living plant cells

2004

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“…Much of the aroma appears to be associated with the calyx; however, it is unfortunately lost before the fruit reaches the consumer via the markets. Dalal et al (1965Dalal et al ( , 1966 found that the total volatile reducing substances increased continuously as tomatoes matured and ripened.…”

Section: 59volatile Componentsmentioning

confidence: 99%

Studies on Ripening Procedures for Perishable Commodities Intended for the Domestic Market in Sri Lanka

Jayawickreme¹

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Chapter 1 Introduction 01 Chapter 2 Literature Survey 04 2.1. Ripening of Fruits 2.1.1. Introduction 04 2.1.2. Respiration 05 2.1 3 Activity of Ethylene 08 2.1.4 Influence of Other Compounds on the Receptors 17 2.1.5 Ethylene Releasing Compounds 18 2.5.2. Marketing Sequence and Losses in Sri Lanka 52 2.5.3. Pigments in Tomato 53 ff 2.5.4. Effect of Postharvest storage 53 2.5.5. Biosynthetic pathway of pigments 2.5.6. Moisture Content 55 2.5.7. Organic Acids 2.5.8. Carbohydrates 2.5.9. Volatile Components 2.5.10. Phenolic Compounds Chapter 3-Scope of thesis 58 Chapter 4 Materials and Methods Experiments with Banana 4.1 Influence of Ethylene Gas on Ripening of Banana 60 4.2 Influence of 2Chloroethyl Phosphonic (ethrel) acid on 64 Ripening Attributes of Banana. 4.3 Comparative Effects of Selected Ripening Agents on 67 Physico-chemical and organoleptic Characteristics of banana. 4.4 Influence of Temperature on Ripening of Banana 68 4.5 Minimum Threshold Time to Ripen Banana 69 Iv Experiments with Papaya 4.6 Influence of Ethylene Gas on Ripening of Papaya 71 4.7 Influence of 2Chloroethyl Phosphonic (ethrel) acid on Ripening Attributes of Papaya (variety Rathna) 4.8. Influence of 2Chloroethyl Phosphonic (ethrel) acid on Colour 73 development of Papaya (mixed varieties) 4.9 Comparative Effects of Selected Ripening Agents on physico-75 chemical and organoleptic Characteristics of Papaya. 4.10 Influence of Temperature on Ripening of Papaya 76 Experiments with Mango 4.11 Influence of Ethylene Gas on Ripening of Mango 78 4.12 Influence of 2Chloroethyl Phosphonic (ethrel) acid on Ripening Attributes of Mango 4.13 Comparative Effects of Selected Ripening Agents on mango 4.14 Influence of Temperature on Ripening of Mango V 4.15 Study of Physico-chemical Parameters of Mango 82 During Development (71h to week) 4.16 Influence of the Maturity Stage on the Quality 84 of Mango Exposed to Ethylene. Experiments with Tomato 4.17 Influence of Ethylene Gas on Ripening of Tomato 85 4.18 Influence of 2Chloroethyl Phosphonic (ethrel) acid 87 on Ripening Attributes of Tomato 4.19 Comparative Effects of Selected Ripening Agents 88 on physico-chemical and Organoleptic Characteristics of Tomato 4.20 Influence of Temperature on Ripening of Tomato 90 4.21 Development of Red Colour in Harvested Tomato 91 via Light Treatment at Ambient Temperature. vi 4.22. Development of Red Colour in Harvested Tomato 92 via Light Treatment at Low Temperature 4.23. Effect of Temperature and Time on Storage of Tomato 93 4.24 Influence of Ethrel and Temperature on Ripening of 95 Stored Tomato Chapter 5 Results Experiments with Banana 5.1 Influence of Ethylene Gas on Ripening of Banana 5.2 Influence of 2Chloroethyl Phosphonic (ethrel) acid on Ripening Attributes of Banana. I wish to express my gratitude and heartfelt thanks to my supervisor Dr. Shanthi Wilson Wijerathnam, Manager Postharvest Technology group of the Industrial Technological Institute for her invaluable advice, encouragement, guidance and support extended to me at all times during the period of my rese...

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“…It is therefore well recognized that plants grown in a glasshouse differ from plants grown in the field (i.e. see Dalal et al ., ). It is also known that genotypic expression is often dependent on the environment, and genetic parameters estimated in glasshouse experiments may differ from those expressed in the field (Falconer and Mackay, ; Gillespie and Turelli, ).…”

Section: Introductionmentioning

confidence: 97%

Gene profiling in partially resistant and susceptible near‐isogenic tomatoes in response to late blight in the field

Cai

Restrepo

Myers

et al. 2012

Molecular Plant Pathology

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In order to better understand resistance to Phytophthora infestans in tomato, we compared the global gene expression of the susceptible tomato, M82, with its more resistant near-isogenic line, 6-2 (IL6-2), under field conditions using a microarray with more than 12 800 tomato expressed sequence tags (ESTs). Because variance in the field was a major concern, we investigated the likelihood of false positives or false negatives and demonstrated that either probability was very low. The two isolines had indistinguishable constitutive gene expressions prior to inoculation. However, a few genes were particularly prone to variation in both isolines in the absence of P. infestans. Included among these genes were catalase, genes coding for pathogenesis-related proteins, endochitinase and cytochrome P450. In response to inoculation with P. infestans, a time course of gene expression identified 1248 transcripts that were similarly induced or repressed in each line, and 991 that were differentially expressed between the two lines. These differences provide hypotheses to explain the difference in resistance between the two isolines. For example, one hypothesis is that genes up-regulated in IL6-2 in response to inoculation with P. infestans, but not up-regulated in M82, contribute to the resistance in IL6-2. Using virus-induced gene silencing (VIGS), we were able to partially silence two such genes-one encoded a protein with homology to an R gene with the Toll/interleukin-1 receptor-nucleotide-binding site-leucine-rich repeat (TIR-NBS-LRR) motif (37O19) and the other encoded a peroxisomal membrane protein (35P7). Partial silencing of 37O19 reduced the resistance in IL6-2 (P = 0.001), but had no effect on the response of M82. Partial silencing of 35P7 reduced the resistance in IL6-2 moderately significantly (P = 0.067), but had no effect in M82. We expect that hypotheses developed from this gene expression study performed under field conditions will provide an important avenue to an accurate understanding of the genes involved in resistance.

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Certain Physiological and Biochemical Changes in Greenhouse‐Grown Tomatoes (Lycopersicon Esculentum Mill.)

Cited by 11 publications

References 5 publications

Primary cell wall metabolism: tracking the careers of wall polymers in living plant cells

Primary cell wall metabolism: tracking the careers of wall polymers in living plant cells

Studies on Ripening Procedures for Perishable Commodities Intended for the Domestic Market in Sri Lanka

Gene profiling in partially resistant and susceptible near‐isogenic tomatoes in response to late blight in the field

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