Transpiration and Ion Absorption

Hylmö, Bertil

doi:10.1111/j.1399-3054.1953.tb08952.x

Cited by 192 publications

(64 citation statements)

References 72 publications

(12 reference statements)

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“…There was therefore no evidence for regulation by ion circulation through the plant and a return to the medium of the excess, i.e. those ions not absorbed by individual cells of the shoot, as suggested by Hylmo (1953). Chloride of the root does not exchange markedly with the medium.…”

Section: (A) Chloride Uptake and Retranslocation In The Whole Plant mentioning

confidence: 99%

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Plant Response to Saline Substrates V. Chloride Regulation in the Individual Organs of Hordeum Vulgare During Treatment with Sodium Chloride

Greenway¹,

Gunn²,

Pitman³

et al. 1965

Aust. Jnl. Of Bio. Sci.

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SummaryThis is a study on the regulation of chloride concentrations in H. vulgare at the early tillering stage, when grown on media of high sodium chloride concentration. 36CI was used during certain periods to determine retranslocation.Chloride, which had been absorbed either during the first 5 days, or between the fifth and tenth day of sodium chloride treatment, was not lost from the whole plant during subsequent periods, and this chloride moved to the shoot. Over the same period there was further chloride uptake from the medium.Developed leaves lost only small amounts of chloride by retranslocation and the concurrent intake far exceeded this loss. Evidence is presented that low concentrations in younger leaves are due to low mobility of chloride already taken up by older organs of the shoot, and not to a chloride exclusion by younger organs.It is concluded that chloride contents within the shoot of H. vulgare are regulated at two locations:(1) During transfer from the root to the shoot.(2) During translocation from older to younger organs.In growing organs, ion concentrations depend not only on the rates of ion uptake but also on relative growth rates, i.e. ion concentrations at anyone time are higher at low than at high relative growth rates.This interaction between growth and ion concentration is discussed in relation to ion imbalance, osmotic adjustments, and salt tolerance.

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Section: (A) Chloride Uptake and Retranslocation In The Whole Plant mentioning

confidence: 99%

“…H. vulgare does not increase in succulence on media of high sodium chloride concentration (Eaton 1942;Greenway 1962a) and has no salt glands. Thus, ion regulation in the shoot can be achieved only by ion export to the medium via the roots (Hylmo 1953), or by limitation of ion transfer to the shoot.…”

Section: Introductionmentioning

confidence: 99%

Plant Response to Saline Substrates V. Chloride Regulation in the Individual Organs of Hordeum Vulgare During Treatment with Sodium Chloride

Greenway¹,

Gunn²,

Pitman³

et al. 1965

Aust. Jnl. Of Bio. Sci.

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“…As the upward translocation of ions appears to occur in the xylem it is not surprising that there is a close correlation between the regions of maximum water and mineral absorption. Hylmo (11) has recently presented convincing evidence of increased absorption of CaCl2 by pea plants accompanying increased absorption of water.…”

Section: Translocation Of Radioactive Isotopes From Various Regions Omentioning

confidence: 99%

Translocation of Radioactive Isotopes from Various Regions of Roots of Barley Seedlings.

1954

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“…Hylmo 1953Hylmo , 1955Hylmo , 1958. Such a model could explain the decrease in selectivity, which should be quantitatively related to the effect of transpiration on total uptake.…”

mentioning

confidence: 99%

Transpiration and the Selective Uptake of Potassium by Barley Seedlings (Hordeum Vulgare Cv. Bolivia)

Pitman¹

1965

Aust. Jnl. Of Bio. Sci.

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SummarySelective potassium uptake by barley seedlings decreases with increased solution concentrations above 20 m-equiv /1. This decrease is shown to be due to an action of transpiration. Total uptake of potassium and sodium was unaffected by transpiration, but increased transpiration rate increased sodium uptake and decreased potassium uptake. These changes in sodium and potassium content are difficult to explain in terms of "passive" metabolic components of uptake. It is suggested that sodium and potassium uptake to the shoot is controlled by active anion transport and that water flux acts on movement of sodium and potassium through the root to the site of active transport.

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Transpiration and Ion Absorption

Cited by 192 publications

References 72 publications

Plant Response to Saline Substrates V. Chloride Regulation in the Individual Organs of Hordeum Vulgare During Treatment with Sodium Chloride

Plant Response to Saline Substrates V. Chloride Regulation in the Individual Organs of Hordeum Vulgare During Treatment with Sodium Chloride

Translocation of Radioactive Isotopes from Various Regions of Roots of Barley Seedlings.

Transpiration and the Selective Uptake of Potassium by Barley Seedlings (Hordeum Vulgare Cv. Bolivia)

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