Thinning Peaches with 3-Chlorophenoxy-a-Propionamide1,2

Stembridge, G. E.; Gambrell, C. E.

doi:10.21273/jashs.94.6.570

Cited by 4 publications

(6 citation statements)

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“…The cultivars in our experiments showed relatively uniform thinning response to postbloom Ethrel sprays. This contrasts sharply with the marked cultivar differences in response to other postbloom thinners, such as 3-CPA (1,15).…”

Section: Resultsmentioning

confidence: 82%

“…Increased thinning effectiveness of Ethrel during the latter part of Stage I (Table 3) and its inducement of fruit abscission during Stage II (Table 5) is contrary to the pattern of thinning response which characterizes naphthaleneacetic acid (NAA) (9,10,11) and 3-CPA (1,15). Leuty and Bukovac (10) hypothesized that NAA caused abscission through induced malfunction of the seed, which occurred when the regulator was applied at endosperm cytokinesis.…”

Section: Resultsmentioning

confidence: 99%

“…Blossom or fruit abscission was determined by calculating the number of peaches per tree at harvest, using average fruit weight and yield data. We found previously (15) that this index of thinning is closely correlated with conventional fruit set counts and is an adequate substitute. Average fruit weight was determined at harvest in all experiments by weighing 30-fruit samples taken from each tree at each picking date.…”

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confidence: 79%

Section: Methodsmentioning

confidence: 99%

“…These sprays were applied in concentrations shown in Table 2 when fruit development, as indicated by ovule length, coincided approximately with endosperm cytokinesis (14). Other postbloom peach thinners are effective at this stage of fruit development (10,11,15).To study the timing of treatment, a 100 ppm Ethrel spray was applied to 'Redskin' at 22 days after full bloom (AFB) in 1969 and at weekly intervals until the end of Stage l3 } the ^Received for publication February 9, 1970. Tech.…”

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confidence: 99%

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Thinning Peaches with Bloom and Postbloom Applications of 2-Chloroethylphosphonic Acid1

Stembridge

Gambrell

1971

J. Amer. Soc. Hort. Sci.

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Bloom or postbloom sprays of 2-chloroethylphosphonic acid (Ethrel) thinned peaches. Applications at full bloom did not produce consistent thinning in ‘Cardinal’. Postbloom sprays applied approximately at endosperm cytokinesis produced consistent thinning of 3 cultivars. Degree of thinning was related to time of Ethrel application. Most thinning was obtained when Ethrel was applied near the end of Stage I or during Stage II. Ethrel sprays within a month after full bloom caused significant fruit size reduction that persisted 2 months or more after treatment. Ethrel sprays within 50 days of harvest accelerated maturity of several cultivars.

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Section: Resultsmentioning

confidence: 82%

Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 79%

Section: Methodsmentioning

confidence: 99%

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confidence: 99%

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Thinning Peaches with Bloom and Postbloom Applications of 2-Chloroethylphosphonic Acid1

Stembridge

Gambrell

1971

J. Amer. Soc. Hort. Sci.

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Peaches

Teskey

Shoemaker

1978

Tree Fruit Production

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Indole-3-acetic acid concentration and ethylene evolution during early fruit development in peach

Miller

Walsh

1990

Plant Growth Regul

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Ethylene evolution was measured from greenhouse-grown 'Jerseyglo' peach fruits beginning 29 days after anthesis. Indole-3-acetic acid (IAA) levels were measured in the pericarp and seed tissues of individual fruits on a single shoot when variable ethylene evolution was noted . Despite hand-pollinating all flowers on the same day, variability within the shoot existed in fruit fresh weight, IAA levels, and ethylene evolution . Seed IAA concentration increased as fruit and seed fresh weight increased and ranged from 106 to 1572 ng . g -' . As pericarp fresh weight increased, IAA levels in this tissue decreased . Ethylene evolution rates ranged from 0 .21 to 1 .07 nl. g. -'h -'and were not correlated with IAA concentration in seed, pericarp, or the whole fruit . High rates of ethylene evolution from the whole fruit occurred prior to increased IAA concentration in the seed .Fruits were excised from field-grown `Redskin' peach trees beginning 40 days after full bloom . Fruits from field sampled shoots appeared to be more physiologically advanced than the greenhouse-grown 'Jerseyglo' fruits . Pericarp IAA concentration was low, ranging from 2 .8 to 6 .5 ng. g -' . Seed concentrations accounted for 75% of the IAA found in the fruit and ranged from 239 to 1042 ng . g -' . As with greenhouse-grown samples, whole fruit IAA concentration tended to decrease as fruits increased in fresh weight . . IntroductionPeach fruit display a double sigmoidal growth curve . During Stage I, the growth of the pericarp is rapid . Stage II, or the lag phase of growth, is characterized by rapid development of the embryo, lignification of the endocarp, and decreased pericarp growth rate . The mesocarp undergoes rapid growth by cell enlargement during Stage III . The endogenous systems which regulate these stages are not known, but several scientists have described regulating roles for hormones . Jackson [8] observed high gibberellin-like activity in the pericarp of fruits during Stage I . Ethylene production also occurs at relatively high rates at that time and 1-aminocyclopropane-1-carboxylic acid concentration peaks in the fruit [9,13,14] . These increases 38 appear to be coincident with cytokinesis of the endosperm [13] . Auxin levels are also high during Stage I [14] .A positive correlation in auxin and ethylene biosynthesis has been reported in several plant organs [23] . Endogenous IAA concentrations and rates of ethylene evolution were positively correlated in studies of peach fruit development [14] . In that work, the IAA data were obtained from pooled fruit samples ; therefore, the hypothesis that variable ethylene evolution rates were positively correlated with IAA concentration of individual fruits could not be tested .The purpose of the current study was to determine if IAA concentration is positively correlated with ethylene evolution rates on a single fruit basis . Materials and methodsPlant material. One-year-old 'Jerseyglo' peach trees grafted onto 'Halford' rootstock were planted in 20 liter pots, containing a mixture of soil :...

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Thinning Peaches with 3-Chlorophenoxy-a-Propionamide1,2

Cited by 4 publications

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Thinning Peaches with Bloom and Postbloom Applications of 2-Chloroethylphosphonic Acid1

Thinning Peaches with Bloom and Postbloom Applications of 2-Chloroethylphosphonic Acid1

Peaches

Indole-3-acetic acid concentration and ethylene evolution during early fruit development in peach

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