Induction of Resistance to Dark Abscission by Malformin in White Light

Curtis, Roy W.

doi:10.1104/pp.62.2.264

Cited by 3 publications

(1 citation statement)

References 9 publications

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“…Preliminary examination of various light (blue, green, and red) bands demonstrated the red portion of the spectrum was more influential than any of the other wavelengths tested (data not reported). These results support other investigations where red light has been reported to influence the abscission rate of apple flowers and fruit (1,8) soybean pods (7), and malformin-treated mung bean leaves (4)(5)(6).…”

Section: Discussionsupporting

confidence: 92%

Abscission: Quantification of Light Control

Decoteau¹,

Craker²

1983

Plant Physiol.

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ABSTRACrLow level red light treatments prevented dark-induced leaf abscission in mung bean ( Vigna radiata L. Wilczek cv Jumbo) cuttings. The amount of inhibition depended upon the level and length of the light treatment. The red light inhibition could be reversed by a brief exposure of tissue to far-red light.Although an effect of light on abscission has been indicated for several years (9), few studies have attempted to define the controlling light variables. Fragmentary information has suggested the important regulatory effects are due to changes in photosynthesis (2, 12) and/or photoperiod (10, 11). Only recently has Curtis (5, 6) implicated phytochrome as a light-sensing mechanism active in inhibition of malformin-induced leaf abscission of mung beans. Data of Brooks (1) were used in these studies. Experimental plant cuttings, consisting of primary opposite leaves and apical bud attached to 5 cm of stem, were made 8 d after seeding. The cuttings were inserted vertically (cut end down) into 50-ml beakers containing approximately 45 ml of distilled H20 and exposed to light treatments in a controlled environment chamber at the above temperature.

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Section: Discussionsupporting

confidence: 92%

Abscission: Quantification of Light Control

Decoteau¹,

Craker²

1983

Plant Physiol.

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Phytochrome involvement in the induction of resistance to dark abscission by malformin

Curtis

1978

Planta

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The active portion of the visible spectrum which is required for malformin to produce leaves which are resistant to dark abscission from cuttings of Phaseolus aureus is red light. Abscission resistance was partially to almost completely lost by far irradiation prior to dark incubation. Although Ethrel, an ethylene releasing compound, stimulated dark abscission of resistant and control leaves, resistance was not lost because control leaves always abscised at a greater rate. The participation of phytochrome in the induction of abscission resistance by malformin is indicated.

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