Effectiveness of Growth Substances in Delaying Abscission of Coleus Petioles

Gardner, Fiona; Cooper, William C.

doi:10.1086/335193

Cited by 24 publications

(10 citation statements)

References 4 publications

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“…Myers (11,12,13) and Gardner and Cooper (4) by their deblading experiments in Coleus have essentially proved that auxin is responsible for the prevention of leaf drop. They concluded that the leaf blade was the source of the phytohormone naturally serving this function.…”

mentioning

confidence: 99%

The Promotion of Abscission by Auxin

Gaur¹,

Leopold²

1955

Plant Physiol.

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confidence: 99%

The Promotion of Abscission by Auxin

Gaur¹,

Leopold²

1955

Plant Physiol.

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“…Since that time, numerous reports have added substantial support to the idea that auxins control abscission through an inhibitory influence (1,10,19, 25). More recently the concept of hormonal control has been extended to include auxin promotion of abscission as well (1,11).…”

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confidence: 99%

Factors Influencing Abscission.

Biggs¹,

Leopold²

1957

Plant Physiol.

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The hormonal concept of abscission control was spearheaded by the suggestive experiments of Laibach in 1933 (15) and then more specifically established by the experiments of La Rue (17) in which he found that indoleacetic acid, pollen extracts, or urine could delay the abscission of debladed petioles. Since that time, numerous reports have added substantial support to the idea that auxins control abscission through an inhibitory influence (1,10,19, 25). More recently the concept of hormonal control has been extended to include auxin promotion of abscission as well (1,11).A useful tool for studying the effects of various substances on abscission has been the petiole explant test described by Addicott et al (4). This test with modification has been used subsequently by a number of workers: by Livingston (18) to study the effects of ethylene, sucrose, and auxins on abscission; by Carns (6) to study the influence of metabolic inhibitors; by Osborne (21) to seek a natural factor which promotes abscission; and by Gaur and Leopold (11) to study the quantitative effects of auxin on abscission.It has been observed in this laboratory that explant tests performed under similar conditions but at different times showed a considerable degree of variation and in fact in some tests no abscission occurred at all. The following experiments were undertaken to establish a more reliable explant test and to clarify some of the factors influencing abscission. Interactions between leaf age, substrates, light and auxin are described.MATERIAL AND METHODS Seedlings of Phaseolus vulgaris L. var. Red Kidney, were grown in flats in the greenhouse on a 16-hour-day. Daylength was extended with incandescent lamps giving approximately 70 ft-c at plant level.Explants 1 cm in length were taken from the primary leaves to include 5 mm of petiole and 5 mm of pulvinus tissue. These explants were placed in 5-cm Petri dishes, basal end down, to a 4-mm depth in 1 % agar with or without addenda. There were 20 explants per treatment. Each experiment reported here was repeated in its entirety at least 3 times and the results are consistent with 35 other experiments encompassing variations on these reported ones. Napthaleneacetic acid (NAA) was incorporated into the agar as its ammonium salt. No organic solvent was used to dissolve the auxin.Light treatments given to the explants involved a 12-hr day w ith 300 ft-c light intensity supplied by

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“…Using potato leaf epinasty as a qualitative bioassay, Denny and Miller (3) showed production of an active emanation, presumably ethylene, by detached leaves of dandelion, rhubarb, calla, hollyhock and leafy stalks of peony. This work was extended by Denny (2), using chopped leaves of rhubarb, lettuce, potato, tomato, onion, Virgfinia creeper and rose.…”

Section: Discussionmentioning

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Auxin Inactivation and Its Relation to Leaf Drop Caused by the Fungus Omphalia Flavida

Steeves

1954

Plant Physiol.

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Effectiveness of Growth Substances in Delaying Abscission of Coleus Petioles

Cited by 24 publications

References 4 publications

The Promotion of Abscission by Auxin

The Promotion of Abscission by Auxin

Factors Influencing Abscission.

Auxin Inactivation and Its Relation to Leaf Drop Caused by the Fungus Omphalia Flavida

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