Suitability of Rb‐86 as a Tracer for Potassium in Studies Relating to Potassium Uptake by Maize, Sugar Beet and Four Varieties of Barley

Schimansky, Ch.; Marschner, H.

doi:10.1002/jpln.19711290208

Cited by 18 publications

(3 citation statements)

References 11 publications

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“…The percentage difference between Fergus and Conquest declined from 50 at 0.01 mm K+ to 17% at 0.2 mM K+. Differences in rates of uptake and translocation for K+ of a similar order of magnitude have previously been shown to exist between cultivars of various crop plants (7,15,19 Figure 2. The inset in this figure reveals the pattern of plasmalemma efflux dissected from the overall pattern of efflux by the standard procedure of subtracting the slower (vacuolar) efflux characteristics.…”

Section: Resultsmentioning

confidence: 63%

Varietal Differences in Potassium Uptake by Barley

Glass

Perley²

1980

Plant Physiol.

102

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Potassium influx isotherms were obtaiwd for 10 cultvars of barley using plants which had been grown with or without potasslim ( (4,12,14). Despite extensive investigations by plant physiologists which have sought to characterize the underlying mechanisms ofion absorption, little attention has been paid to the potential practical application of these findings to the search for such strains.There are clear indications that ion absorption by plants is under genetic control and that considerable differences exist both between and within genera (7,8,13

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Section: Resultsmentioning

confidence: 63%

Varietal Differences in Potassium Uptake by Barley

Glass

Perley²

1980

Plant Physiol.

102

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“…Simultaneous bidirectional fluxes can, however, lead to considerable fractionation of isotopes (Morgan et al 1973, Lee 1982. Plant species and cultivars may have differential '*^Rb"'/K'^-selectivity in both the uptake and the translocation step, varying with the K+-status of the plant material (Schimansky and Marschner 1971, Pettersson 1978, Jensen and Kylin 1980.…”

Section: Introductionmentioning

confidence: 99%

Phosphorus nutrition of barley, buckwheat and rape seedlings. I. Influence of seed‐borne P and external P levels on growth, P content and ³²P/³¹P‐fractionation in shoots and roots

Schjørring¹,

Jensen

1984

Physiologia Plantarum

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Schjørring, J. K. and Jensén, P. 1984. Phosphorus nutrition of barley, buckwheat and rape seedlings. I. Influence of seed‐borne P and external P levels on growth, P content and 32P/31P‐fractionation in shoots and roots. Seedlings of barly (Hordeum vulgare L. cvs Salka and Zita), buckwheat (Fagopyrum esculentum Moench) and rape (Brassica napus L. ssp. napus ev. Line) were grown at 8 or 10 different external P levels in the range 0‐2000 μM. Apart from P, the nutrient solutions were complete. In some experiments with barley and rape, 32P‐labelled phosphate was used. Root fresh weights of buckwheat and rape decreased when the external P supply exceeded the level required for maximal root development. In all three species, the roots constituted a decreasing proportion of the total plant fresh weight as the external P level increased. The shoot/root fresh weight ratio increased linearly with the P concentration of the roots. The ratio between the P concentration in shoots and roots increased with the P status of the seedlings grown at low to intermediate external P levels, but decreased at higher P levels. The proportion of total seedling‐P held in roots consequently reached a minimum value and thereafter increased as the P status of the seedlings increased. This indicates that some control mechanism counteracted the accumulation of harmful P levels in the shoots. 32P‐Phosphate uptake by seedlings of barley and rape grown in solutions with 2 μM P overestimated the actual net phosphorus uptake by a factor of 6 to 7, indicating a marked fractionation of 32P and 31P. For seedlings grown in solutions with 25 μM P (barley) or 50 μM (rape) no fractionation occurred. The relative excess of 32P in high P seedlings accumulated in the roots. It is suggested that the fracionation was caused by efflux of low specific activity phosphorus and by diffusion of free phosphate ions across the plasmalemma of the root cells in response to a difference in the concentration gradient between the two P isotopes.

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“…16) accumulated elements poorly (Figs 2-4). In addition to root size, differences among cultivars of barley in net ion uptake may also be due to different flux rates into and out of the roots (Schimansky and Marschner 1971, Pettersson 1978, Glass and Perley 1980, Jensen and Pettersson 1980, Glass et al 1981.…”

Section: Discussionmentioning

confidence: 99%

Varietal differences in uptake and utilization of nitrogen and other macro‐elements in seedlings of barley, Hordeum vulgare

Perby

Jensen

1983

Physiologia Plantarum

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Growth and uptake of N, P, S, K, Ca and Mg in barley (Hordeum vulgare L.) were studied in water culture using young plants of 17 cultivars. Large varietal differences were obtained in dry weight production and mineral accumulation. The differences were not the same for plants grown in high‐ and low‐salt media. For plants grown under both conditions there was a good correlation between dry weight production and total N content. Total shoot contents of K and Ca were closely correlated with shoot dry weight. Utilization of P and S in high‐ and low‐salt plants and Mg in low‐salt plants was variable in relation to dry weight production in both types of nutrient conditions. The correlation between dry weight and total content of Mg in high‐salt plants was good. These differences in mineral economy between young barley plants were partly caused by varietal differences in relative growth rate, and in high‐salt seedlings also by differences in seed content of N. The significance of root size, and of uptake, root‐shoot partitioning and use‐efficiency of specific elements differed; all four factors were important for P and S, but had varying impact on K, Mg and Ca. For N, differences in root size and ion accumulation were the most important factors causing varietal variation in mineral nutrition. – In a special experiment seedlings of barley were transferred to N‐free nutrient solution after six days of adequate N supply. There was no significant varietal differences in use‐efficiency ratio of N. Root/shoot partitioning of N was unaffected.

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Suitability of Rb‐86 as a Tracer for Potassium in Studies Relating to Potassium Uptake by Maize, Sugar Beet and Four Varieties of Barley

Cited by 18 publications

References 11 publications

Varietal Differences in Potassium Uptake by Barley

Varietal Differences in Potassium Uptake by Barley

Phosphorus nutrition of barley, buckwheat and rape seedlings. I. Influence of seed‐borne P and external P levels on growth, P content and ³²P/³¹P‐fractionation in shoots and roots

Varietal differences in uptake and utilization of nitrogen and other macro‐elements in seedlings of barley, Hordeum vulgare

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