On the Effects of Auxins on Membrane Permeability and Pectic Substances in Bean Endocarp

Glasziou, K. T.; Sacher, Joseph A.; McCalla, D. R.

doi:10.1002/j.1537-2197.1960.tb07160.x

American J of Botany

1960

DOI: 10.1002/j.1537-2197.1960.tb07160.x

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On the Effects of Auxins on Membrane Permeability and Pectic Substances in Bean Endocarp

K. T. Glasziou

Joseph A. Sacher

D. R. McCalla

Abstract: Glasziou, Kenneth T. (Colonial Sugar Refining Co., Sydney, Australia), Joseph A. Sacher, and Dennis R. McCalla. On the effects of auxins on membrane permeability and pectic substances in bean endocarp. Amer. Jour. Bot. 47(9) : 743–752. Illus. 1960.—A study has been made on the differences between bean endccarp segments maintained in the presence and absence of auxin. In this tissue, the effect of auxin is to delay a senescence phenomenon which involves changes in permeability, liquid‐logging of air spaces, cel… Show more

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1973

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Cited by 25 publications

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An Iaa Oxidase‐inhibitor System in Bean Pods. I. Physiological Significance and Source of the Inhibitor

Sacher

1961

American J of Botany

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Sacher, Joseph A. (Los Angeles State Coll., Los Angeles, Calif.) An IAA oxidase‐inhibitor system in bean pods. I. Physiological significance and source of the inhibitor. Amer. Jour. Bot. 48(9): 820–828. Illus. 1961.—In ‘Kentucky Wonder’ pole bean pod segments, a correlation is shown between the resistance and susceptibility to senescence of exocarp and endocarp, respectively, in the absence of exogenous auxin, and the distribution of a natural, heat‐stable, dialyzable inhibitor of IAA oxidase. The tissues are similar in content of IAA oxidase, but the exocarp, which is resistant to senescence, has a high content of inhibitor. The endocarp, which senesces readily, has none. The greater efficacy of naphthalene acetic acid than IAA in delaying senescence of endocarp, in experiments which minimized or eliminated the effect of the destruction of IAA at cut surfaces, suggested this was due to the endogenous destruction of IAA. But the application of inhibitor did not delay senescence of endocarp. The inhibitor content of exocarp increased 2–5 fold with aging. Reaction mixtures containing non‐dialyzed exocarp enzyme solution showed no IAA destruction for 4 1/2 + hr, while with exocarp slices IAA destruction proceeded rapidly after a 10‐min lag. Evidence is presented which indicates that cytoplasmic particulates are the source of the dialyzable inhibitor.

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An Iaa Oxidase‐inhibitor System in Bean Pods. I. Physiological Significance and Source of the Inhibitor

Sacher

1961

American J of Botany

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Senescence: Hormonal Control of Rna and Protein Synthesis in Excised Bean Pod Tissue

Sacher

1965

American J of Botany

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The kinetics of degradation of RNA, total protein, ribosomal and soluble (R‐S) protein and DNA were followed over 24 hours in excised segments of Kentucky Wonder pole beans (Phaseolus vulgaris). In absence of exogenous auxin, RNA degradation proceeded from about zero time. By 15 hours, after about 20% of the RNA had degraded, the degradation of DNA, total protein and R‐S protein was initiated. Exogenous auxin (25 ppm α‐napthaleneacetic acid) prevented these degradations. The addition of kinetin had little or no effect. Auxin enhanced incorporation of orotic acid into RNA two to several times more than it did amino acids into protein. Actinomycin D repressed RNA synthesis about 75% including a repression of auxin‐induced synthesis. It had no effect on the basal level of protein synthesis but did repress auxin‐induced synthesis. The results indicate that the primary action of auxin in preventing senescence of bean endocarp tissue is at the site of RNA synthesis, and the effect of auxin on DNA and protein is a consequence of the effect of auxin on RNA metabolism.

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Cavitation studies on whole Ricinus plants by acoustic detection

Milburn

1973

Planta

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Acoustic detection has been used to investigate the incidence of cavitation in whole potted Ricinus plants subjected to water stress by withholding water. Cavitation proceeded rather slowly and was detectable before and during wilting. Techniques which restricted water uptake more drastically such as root cooling or overlapping cuts induced more rapid "click" production and wilting; a response already described for excised leaves. When water stress was removed by rewatering, or rewarming a cooled root system, cavitation soon ceased. This response was more sluggish of over-delayed.Cavitation in aging leaves on well watered plants has also been examined. Despite the onset of senescence over many days there was no evidence that dry patches, which often develop extensively, are a consequence of water shortage induced by xylem blockage. Leaves, falling naturally by abscission in still air, were often remarkably turgid with water potentials similar to those of healthy attached leaves. Only after losing water was cavitation apparent, as usual for excised mature leaves. Sometimes more persistent leaves did cavitate in situ, just before abscission, showing that in normal leaves xylem blockage can occasionally precede leaf fall by several hours.

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On the Effects of Auxins on Membrane Permeability and Pectic Substances in Bean Endocarp

Cited by 25 publications

References 32 publications

An Iaa Oxidase‐inhibitor System in Bean Pods. I. Physiological Significance and Source of the Inhibitor

An Iaa Oxidase‐inhibitor System in Bean Pods. I. Physiological Significance and Source of the Inhibitor

Senescence: Hormonal Control of Rna and Protein Synthesis in Excised Bean Pod Tissue

Cavitation studies on whole Ricinus plants by acoustic detection

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