On Diurnal Variations in the Mineral Content of the Leaf of the Cotton Plant1

Phillis, E.; Mason, Tony

doi:10.1093/oxfordjournals.aob.a088415

Cited by 19 publications

(7 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…parts (Table 3). Thus for the leaves of harvest-interval 3-4, " In this discussion it is understood that we are concerned only with net change over periods of several days, though the same principles would doubtless hold for the interpretation of diurnal fluctuations such as those suggested by the work of Phillis and Mason (1942a ) with leaves of the cotton plant. By contrast, studies with radioactive phosphorus ( e.g.…”

Section: (I) the Internal Or Growth Factormentioning

confidence: 98%

The Effects of Phosphorus Supply on The Rates of Intake of Phosphorus and Nitrogen and Upon Certain Aspects of Phosphorus Metabolism in Gramineous Plants

Williams¹

1948

Aust. Jnl. Of Bio. Sci.

194

117

View full text Add to dashboard Cite

SummaryFor experiments previously described, new data are presented relating to the intake of phosphorus by gramineous plants, its distribution within the plant, and its partition in the leaves between alcohol-soluble, nucleic-acid, and "residual" phosphorus.Major determinants of the rate of intake of phosphorus by the plant are: ( a) the demand set up by the growth and normal functioning of various plant parts, and (b) the concentration of the nutrient in the medium.It is considered that the indirect effect of phosphorus treatment on growth, and hence on demand, is more important than the direct effects of external concentration of phosphorus on the rates of intake of that nutrient.Even when growth is not limited by the supply of phosphorus, the rate of intake is limited by the maximal capacity of successive plant parts for accumulation.For the oat experiment, rates of intake of phosphorus and nitrogen are expressed per unit weight of root system. With nitrogen, the supply of which was the same for all treatments, large initial effects of phosphorus treatment on the rates of intake are accounted for in terms of differences in the ratios of roots to shoots.Phosphorus-deficient oat plants derived only 30 per cent. of their inflorescence phosphorus from other plant parts; those with an excessive supply derived no less than 93 per cent. of their inflorescence phosphorus from these sources.The percentage phosphorus contents of the stems, leaves, and roots fell ultimately to lower values with a moderate supply of phosphorus than they did with the deficient supply. A more efficient re-utilization of phosphorus in the plants receiving the greater supply is favoured as an interpretation of this "dilution" effect.From an examination of the data for protein-nitrogen and nucleic-acid phosphorus in the leaves of young plants, it is concluded that the effects of phosphorus treatment on protein-nitrogen content at this stage are due primarily to variation in nucleoprotein content.With phosphorus deficiency, oat seedlings soon exhausted their seed reserves of phosphorus, and this was followed by a drastic change in the partitioning of leaf phosphorus, such that absolute nucleic-acid phosphorus was reduced to one-fifth of the value obtaining eleven days earlier, alcohol-soluble phosphorus decreased slightly, and the water-soluble fractions represented by "residual" phosphorus increased by 30 per cent. Total phosphorus was virtually unchanged in amount. During this same period of eleven days, the whole of the phosphorus intake from the medium was retained by the roots, and there was a stimulation of root growth relative to leaf growth. These facts suggest that the high root weight ratios found with phosphorus deficiency may be due to the fixation in organic forms of a greater proportion of the absorbed phosphorus, so that relatively little is available for shoot growth. The literature relating to the partitioning of phosphorus within plant tissues is discussed and, where comparisons are relevant, this is in substantial agreemen...

show abstract

Section: (I) the Internal Or Growth Factormentioning

confidence: 98%

The Effects of Phosphorus Supply on The Rates of Intake of Phosphorus and Nitrogen and Upon Certain Aspects of Phosphorus Metabolism in Gramineous Plants

Williams¹

1948

Aust. Jnl. Of Bio. Sci.

194

117

View full text Add to dashboard Cite

show abstract

“…Ulrich and Ohki (1956) found no movement of chlorine from old to young leaves of chlorinedeficient sugar-beets. Phillis and Mason (1942) found a moderate diurnal fluctuation in chlorine contents of cotton leaves, an increase occurring during the day and a decrease during the night. Harding, Miller, and Fireman (1957) found much higher chlorine contents in the lower leaves of sprinkler-irrigated citrus trees than in the upper leaves; the latter were not normally covered by the sprays.…”

Section: Introductionmentioning

confidence: 94%

Uptake and Translocation of Chlorine in Citrus Cuttings During and After a Short Salt Treatment

Groenewegen¹,

Bouma²,

Gates³

1959

Aust. Jnl. Of Bio. Sci.

View full text Add to dashboard Cite

show abstract

“…WilIstatter (55) drew attention to the fact that magnesium was far in excess of calcium as a constituent of the ash of plant seeds, and this points to a greater mobility for magnesium. Other evidence pointing in this direction is the high diurnal fluctuations found by Phillis & Mason (34) for magnesium in cotton leaves, and the claim by Fudge (12) that developing citrus fruits can remove magnesium from nearby leaves and induce typical deficiency symptoms.…”

mentioning

confidence: 97%

“…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.…”

mentioning

confidence: 99%

Redistribution of Mineral Elements During Development

Williams¹

1955

Annu. Rev. Plant. Physiol.

208

View full text Add to dashboard Cite

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.

show abstract

On Diurnal Variations in the Mineral Content of the Leaf of the Cotton Plant1

Cited by 19 publications

References 0 publications

The Effects of Phosphorus Supply on The Rates of Intake of Phosphorus and Nitrogen and Upon Certain Aspects of Phosphorus Metabolism in Gramineous Plants

The Effects of Phosphorus Supply on The Rates of Intake of Phosphorus and Nitrogen and Upon Certain Aspects of Phosphorus Metabolism in Gramineous Plants

Uptake and Translocation of Chlorine in Citrus Cuttings During and After a Short Salt Treatment

Redistribution of Mineral Elements During Development

Contact Info

Product

Resources

About