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Effect of 1-methylcyclopropene on fl...

MacLean, Dan D.

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Effect of 1-methylcyclopropene on flavonoid and antioxidant metabolism in pome fruits.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Effect of 1-methylcyclopropene on flavonoid and antioxidant metabolism in pome fruits./
Author:	MacLean, Dan D.
Description:	167 p.
Notes:	Source: Dissertation Abstracts International, Volume: 68-03, Section: B, page: 1487.
Contained By:	Dissertation Abstracts International68-03B.
Subject:	Agriculture, Horticulture. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=NR24573
ISBN:	9780494245736

Effect of 1-methylcyclopropene on flavonoid and antioxidant metabolism in pome fruits.
MacLean, Dan D.

Effect of 1-methylcyclopropene on flavonoid and antioxidant metabolism in pome fruits. - 167 p.

Source: Dissertation Abstracts International, Volume: 68-03, Section: B, page: 1487.

Thesis (Ph.D.)--University of Guelph (Canada), 2007.

There has been a growing interest in understanding the role of antioxidants and phenolics in the human diet. Pome fruits are considered one of the greatest sources of dietary phenolics, thus it is important to understand how postharvest practices affect the phytochemical content of these fruits. Recently, the ethylene antagonist 1-methylcyclopropene (1-MCP) has been registered for use on apples (malus x domestica Borkh.), with similar registration being sought for pears (Pyrus communis L.). Because the phenylpropanoid pathway is regulated by ethylene, there is concern that a postharvest 1-MCP treatment may adversely affect the phytochemical content of harvested pome fruit.

ISBN: 9780494245736Subjects--Topical Terms:

1017832
Agriculture, Horticulture.

Effect of 1-methylcyclopropene on flavonoid and antioxidant metabolism in pome fruits.
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035 $a AAINR24573
040 $a UMI $c UMI
100 1 $a MacLean, Dan D. $3 1291648
245 1 0 $a Effect of 1-methylcyclopropene on flavonoid and antioxidant metabolism in pome fruits.
300 $a 167 p.
500 $a Source: Dissertation Abstracts International, Volume: 68-03, Section: B, page: 1487.
502 $a Thesis (Ph.D.)--University of Guelph (Canada), 2007.
520 $a There has been a growing interest in understanding the role of antioxidants and phenolics in the human diet. Pome fruits are considered one of the greatest sources of dietary phenolics, thus it is important to understand how postharvest practices affect the phytochemical content of these fruits. Recently, the ethylene antagonist 1-methylcyclopropene (1-MCP) has been registered for use on apples (malus x domestica Borkh.), with similar registration being sought for pears (Pyrus communis L.). Because the phenylpropanoid pathway is regulated by ethylene, there is concern that a postharvest 1-MCP treatment may adversely affect the phytochemical content of harvested pome fruit.
520 $a The total antioxidant capacity (TAC) of three apple cultivars under various 1-MCP, harvest maturity, storage, and ripening regimes, was determined using a modified total oxyradical scavenging capacity assay. In general, it was found that 1-MCP treatment resulted in significantly higher TAC in 'Delicious' (3%), and 'McIntosh' red (15%) and green (8%) tissues when compared with untreated fruit. Regardless of treatment, the TAC of 'Delicious' was 2-fold greater than 'Empire', while 'McIntosh' red and green tissues were intermediate. A subsequent study investigated the impact of 1-MCP on the postharvest synthesis or retention of phenolic compounds in 'Delicious' apple using HPLC-DAD analysis. 1-MCP treatment appears to have inhibited the catabolism of flavonoids, while concurrently inhibiting the biosynthesis of chlorogenic acid in early-harvested fruit. The effect of 1-MCP on the transcription of two key flavonoid biosynthetic (phenylalanine ammonia-lyase, PAL; and chalcone synthase, CHS), flavonoid transport (glutathione S-transferase, GST), and ethylene perception (ethylene response sensor 1, ERS1) genes was determined. 1-MCP treatment inhibited expression of PAL, CHS and ERS1 transcripts, and simultaneously inhibited ethylene production and chlorogenic acid biosynthesis. In non-treated fruit, an increase in PAL expression with the concomitant post-storage decrease of CHS expression and postharvest decrease of GST expression suggests a diversion of carbon from flavonoid compounds into chlorogenic acid, and perhaps an increased susceptibility of the fruit to the storage disorder superficial scald. These results suggest that 1-MCP treatment does not have a deleterious effect on the TAC or flavonoid concentration of pome fruit, but will result in lower chlorogenic acid concentration in early-harvested fruit.
590 $a School code: 0081.
650 4 $a Agriculture, Horticulture. $3 1017832
650 4 $a Agriculture, Plant Culture. $3 1018669
650 4 $a Biology, Plant Physiology. $3 1017865
690 $a 0471
690 $a 0479
690 $a 0817
710 2 0 $a University of Guelph (Canada). $3 1018650
773 0 $t Dissertation Abstracts International $g 68-03B.
790 $a 0081
791 $a Ph.D.
792 $a 2007
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=NR24573