The Distribution of Zinc in Oat Plants

Wood, JG; Sibly, Pamela M

doi:10.1071/bi9500014

Cited by 14 publications

(7 citation statements)

References 3 publications

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“…T h eir findings for copper and zinc are in marked contrast to those of Wood et al (58,59). For copper their data indi cate net export from the leaves for all soils,3 and, on the average, this amounted to 30 per cent of that present at the penultimate harvest.…”

contrasting

confidence: 59%

Redistribution of Mineral Elements During Development

Williams¹

1955

Annu. Rev. Plant. Physiol.

208

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In the course of a recent address on the control of growth and reproduc tion in plants, Gregory (13) drew attention to the fact that over 90 per cent Of the nitrogen and phosphorus taken up by the developing cereal plant had been accumulated when the dry weight was only 25 per cent of the final value. This store of accumulated nutrient was the reserve on which all later growth and development depended, and its level determined the final yield. The nitrogen and phosphorus which was set free from the senescent leaves and tillers was reutilized for production of further leaves which, in turn, provided for the development of the inflorescence. Gregory also stressed the significance of the meristems with their potentially unlimited demand for nutrients, and their capacity to initiate "internal starvation" and senes cence. These observations serve very well to introduce the review which is to follow for, in examining the evidence for the redistribution of mineral ele ments during development, the reviewer has attempted to relate this to the wider problems of growth.From the outset it should be emphasized that we are primarily concerned with the demonstration and explanation of net losses of mineral elements from specific plant parts. To be relevant, therefore, papers for review had to cover two or more plant parts at several stages of growth. Relatively few of the many papers on the mineral composition of plants fulfil these require ments.It seems probable that some elements simultaneously enter and leave the same organ in the course of the normal metabolic flux, and may be regarded as being redistributed from organs which are still undergoing net intake. Such phenomena are not considered here, and it is for this reason that little reference is made to recent work with radioactive tracers. A borderline case is provided by Phillis & Mason (34) who found diurnal variations in the mineral content of the leaf of the cotton plant. The six elements studied showed increases by day and no change or decrease by night. Although the existence of dew losses complicated the picture, it does seem likely that phloem export was responsible for some losses even before maximum absolute contents had been attained. This evidence is a reminder that there can be no hard and fast line between redistribution resulting from normal metabolic activity within the organ considered and redistribution which is conditioned by senescent changes and by demands which arise externally to that organ.

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contrasting

confidence: 59%

Redistribution of Mineral Elements During Development

Williams¹

1955

Annu. Rev. Plant. Physiol.

208

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“…Other studies of zhic uptake by plants bave been conducted witb regard to the effect of added ions on zinc uptake and translocation in intact plants (U), in subterranean clover (19), in oat plants (25), and on the localisation of zinc-65 in germinating corn tissues (7), etc.…”

Section: Introductionmentioning

confidence: 99%

Mechanism for the Uptake of Zinc by Fontinalis antipyretica

Pickering

Puia

1969

Physiologia Plantarum

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“…The presence of zinc in the relatively lower sedimentating fractions such as mitochondria, plastids and nucleus had been reported at various times and also its function in relation to the association of the cation with DNA and the protein moiety of these organelles (Wood and Sibly 1950, Fujii 1954, Resler and Kositsyn 1970, Riami and Heyde 1970, Slater et al 1971, Randell and Bouma 1973, Zimmer 1973. Consequently, this form of zinc speaks against the possibility of any serious artifact caused by a considerable leakage of "Zn out of these organelles during the conventional washing procedure used throughout the course of fractionation.…”

Section: Discussionmentioning

confidence: 96%

Variations in Zinc Content of Subcellular Fractions from Young and Old Roots, Stems and Leaves of Broad Beans (Vicia faba)

Polar

1976

Physiologia Plantarum

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65Zn labelled seeds of broad beans (Vicia faba L.) germinated and grown in a complete nutrient solution containing the radioisotope were used to investigate the change in the subcellular distribution of this trace element during subsequent development of the labelled seeds. Homogenates of leaves, stems and roots were fractionated into cell‐wall debris, nuclei, chloroplasts, mitochondria, ribosomes and “soluble” fraction. The concentration of the radioisotope in these fractions, expressed as cpm/mg dry weight, was highest in the soluble fraction and in the ribosomes isolated from young tissues. However, as roots and leaves aged, a general decrease in the overall zinc concentration was followed by a similar drop in the concentration of the metal associated with the “soluble” fraction and ribosomes, causing a more or less uniform zinc distribution pattern. On the other hand, there was a general increase in the zinc concentration of the “soluble” and in the particulate fractions of relatively high sedimentation coefficient from older stem samples. Taking also into consideration the dry weight change per unit volume of the tissues under investigation, the relationship between these variations and the metabolism of the plant is discussed.

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The Distribution of Zinc in Oat Plants

Cited by 14 publications

References 3 publications

Redistribution of Mineral Elements During Development

Redistribution of Mineral Elements During Development

Mechanism for the Uptake of Zinc by Fontinalis antipyretica

Variations in Zinc Content of Subcellular Fractions from Young and Old Roots, Stems and Leaves of Broad Beans (Vicia faba)

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