Edward Flaherty - Final Oral Examination for the Degree of M. Sc. of Plant Science

Tuesday, 10 October 2017 - 10:00am

Location: 

CRSC202

Overview: 

ANNOUNCEMENT: Interested Members of the University Community are invited to attend the Final Oral Examination for the Degree of Master of Science of

 

Edward Flaherty

 

Of the Department of Plant Agriculture

On Tuesday, October 10th, 2017 at 10:00 AM

In Room 202, Crop Science Building

 

Thesis Title:  IMPACT OF 1-METHYLCYCLOPROPENE AND CONTROLLED ATMOSPHERE STORAGE ON PEAR FRUIT QUALITY: BIOCHEMICAL AND PHYSIOLOGICAL ANALYSES

 

Advisory Committee 
                                       

Examination Committee

Dr. Gale Bozzo, Advisor

Dr. Istvan Rajcan, Chair

Dr. Barry Shelp, Co-advisor

Dr. Gale Bozzo

Dr. Jennifer DeEll

Dr. Barry Shelp

 

Dr. Dave Wolyn

ABSTRACT

 

European pears are stored under controlled atmosphere (CA) and/or treated with 1-methylcyclopropene (1-MCP) to limit ripening and senescence. However, these practices can induce physiological disorders in pears. A canonical powered-partial least squares analysis determined that senescent scald and internal breakdown in stored ‘AC Harrow Crisp’ pears were associated with decreased concentrations of ascorbate and accumulation of oxalate and γ-aminobutyrate. These disorders and 1-MCP exacerbation of internal cavities were negatively correlated with total and reduced glutathione, reduced glutathione/oxidized glutathione and succinate. Also, internal cavities were associated with lactate accumulation, and negatively linked to malate depletion. Incidences of all three disorders increased with shelf-life in ‘Cold Snap’ pears following CA storage. Moreover, senescence-related disorders were reduced by 1-MCP and 2.5 kPa O2, whereas their impact on internal cavities was inconsistent across two years. Furthermore, occurrence of these disorders was associated with higher ethylene production, peel yellowing and fruit softening.