2005
DOI: 10.21273/jashs.130.4.638
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Pawpaw [Asimina triloba (L.) Dunal] Fruit Ripening. I. Ethylene Biosynthesis and Production

Abstract: Pawpaw fruit ethylene production, 1-aminocyclopropane-1-carboxylic acid (ACC) synthase (ACS) and ACC oxidase (ACO) activities, and tissue content of the ethylene precursor ACC and conjugate malonyl-ACC (MACC) were measured during postharvest ripening. Fruit were harvested near the advent of the ripening process and were ripened at room temperature. The fruit displayed increases in ethylene production and respiration rate during ripening with maxima for both 3 days after harvest. Mean ethylene maxima on… Show more

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Cited by 8 publications
(9 citation statements)
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References 27 publications
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“…From an analysis of all the fruit across both harvest years, each stage exhibited a distinct combination of mean values for fruit fi rmness, ethylene production, and respiration rate ( Table 1). The greatest decline in fruit fi rmness occurred from the pre-to the early ripening stage, while the ethylene and respiratory climacterics occurred afterwards in the mid-ripening stage as has been previously reported (Archbold and Pomper, 2003;Koslanund et al, 2005). POLYGALACTURONASE ACTIVITY.…”
Section: Resultssupporting
confidence: 73%
See 1 more Smart Citation
“…From an analysis of all the fruit across both harvest years, each stage exhibited a distinct combination of mean values for fruit fi rmness, ethylene production, and respiration rate ( Table 1). The greatest decline in fruit fi rmness occurred from the pre-to the early ripening stage, while the ethylene and respiratory climacterics occurred afterwards in the mid-ripening stage as has been previously reported (Archbold and Pomper, 2003;Koslanund et al, 2005). POLYGALACTURONASE ACTIVITY.…”
Section: Resultssupporting
confidence: 73%
“…Starting on each harvest date, fruit were weighed and then ripened at ambient temperature (22 ± 2 °C) on the lab bench. Due to the lack of uniformity in maturity stage at harvest, ripening stages were defi ned from daily ethylene and CO 2 production rates and external fi rmness (techniques in Koslanund et al, 2005) as follows: preripening (no to very slight loss of fi rmness; low respiration and ethylene production), early ripening (some softening; increasing rates of ethylene and CO 2 production), mid-ripening (soft; at or just past the climacteric with the highest rates of respiration and ethylene production), and late ripening (very soft; postclimacteric with low respiration and ethylene production). Fruit were at either the preripening, early ripening, and mid-ripening stages at harvest, and on each day of postharvest ripening at least two of the above classes of fruit could be identifi ed.…”
Section: Methodsmentioning
confidence: 99%
“…The level of ethylene in Karanda fruits reveals that it belongs to the climacteric type. A more or less similar kind of observation was reported in the ripening of pawpaw (Koslanund et al , 2005). According to Blanke (1991) this kind of increase in ethylene and respiration are thought to be necessary to provide ATP and substrates for various anabolic processes associated with ripening of fruit.…”
Section: Resultssupporting
confidence: 78%
“…Certain enzymes that have the potential to degrade cell walls include polygalacturonase, endo-(1,4)- β - d -glucanase, endo- β -1,4-mannanase, and pectin methylesterase (Koslanund et al., 2005), and although it is likely that these enzymes are found in pawpaw, their presence has not been confirmed. Polygalacturonase (EC 3.2.1.15) catalyzes the degradation of cell wall polygalacturonans.…”
Section: Introductionmentioning
confidence: 99%