Species differences in calcium and potassium distributions within plant roots

Chino, Mitsuo

doi:10.1080/00380768.1981.10431304

Cited by 19 publications

(10 citation statements)

References 34 publications

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“…In general, bulk tissue Ca is located in the cell wall as shown by ion-microscopy and electron-microprobe techniques (Campbell et al 1979;Chino 1981). In mature cells, vacuoles can also accumulate Ca to a variable extent (Lin et al 1977;Hanson 1984).…”

Section: Relationships Between Contents Deposition Rates and Flux Stmentioning

confidence: 98%

Spatial distribution of solutes, K, Na, Ca and their deposition rates in the growth zone of primary cotton roots: Effects of NaCl and CaCl2

Zhong

Läuchli

1994

Planta

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Abstract.Cotton (Gossypium hirsutum L. cv. Acala S J-2) seedlings were grown in modified Hoagland nutrient solution with or without 150 mM NaC1 and supplemental 10 mM CaC12. The spatial distribution of bulk-tissue osmotic potential (U?s) and total osmotica, K, Na and Ca contents were determined in the growth zone of the primary root. This information was combined with the growth-velocity data from an earlier study (Zhong and L/iuchli 1993) to estimate net deposition rates of osmoticum, water, K, Na and Ca by using the continuity equation. The u?~ was essentially uniform along the growth region for all treatments and considerably lowered by 150 mM NaC1 in the medium. Total osmotica deposition was well synchronized with growth and deposition rates were enhanced by 150 mM NaC1. Osmoregulation in the treatments with 150 mM NaC1 was indicated by an apparent solute accumulation which appeared to be due to the enhancement of osmoticum deposition rates. The presence of 150 mM NaC1 greatly reduced the deposition rates of K and Ca throughout the growth zone; 10 mM Ca mitigated this effect only on K deposition in the apical 2.5-mm region. The deposition rate of Na was increased greatly by 150 mM NaC1; the increase was reduced by 10 mM Ca. At 150 mM NaC1, selectivity of K versus Na of the root was enhanced greatly in the apical 2 mm region by the presence of 10 mM Ca; this mitigating effect by Ca declined rapidly with distance from the root tip. We conclude that one possible mechanism by which supplemental Ca alleviates the inhibitory effects of NaC1 on cotton root growth is by maintaining plasma-membrane selectivity of K over Na. *Present address:Department of Integrative Biology, University of California, Berkeley, CA 94720, USA Abbreviations and symbol: HCa, LCa = high (10 mM) and low (1 mM) CaCI2; HNa, LNa = high (150 mM) and low (1 mM) NaC1; T~ = osmotic potential Correspondence to: H. Zhong; FAX: I (510) 643 6264;

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Section: Relationships Between Contents Deposition Rates and Flux Stmentioning

confidence: 98%

Spatial distribution of solutes, K, Na, Ca and their deposition rates in the growth zone of primary cotton roots: Effects of NaCl and CaCl2

Zhong

Läuchli

1994

Planta

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“…EPMA performs elemental analyses as well as morphological observations, so that great care must be taken to avoid shrinkage or deformation of the tissues and flowing out or redistribution of elements during the process of preparation of the specimens. Although the frozen specimen method is considered to be the best at present (3)(4)(5), the freeze-drying specimen method was employed in this experiment. As germinating hyacinth roots accumulate a large amount of nutrient, poor results were obtained by the conventional method, such as freeze-drying after slicing fresh samples due to sap bleeding on the cutting surface (Fig.…”

Section: Methodsmentioning

confidence: 99%

Accumulation and Distribution Pattern of Large Amount of Potassium in Hyacinth Roots in Relation to Accompanying Anions

Ikarashi

Ohyama

Baba

1986

Soil Science and Plant Nutrition

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“…A larger cortex might ensure a better supply to the root of oxygen via intercellular air spaces and aerenchyma (Jackson & Armstrong, 1999) as well as provide a larger store for minerals, proteins or lipids (Von Guttenberg, 1968 ;Chino, 1981 ;Luxova, 1992). It has also been suggested that the cortex is important for recycling of phosphorus (Robinson, 1990).…”

Section: The Ecological Importance Of Anatomical Traitsmentioning

confidence: 99%

Root tissue structure is linked to ecological strategies of grasses

2000

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The present study investigated to what extent there is a link between root tissue structure and ecological strategies of plant species ; such a link is known for leaf tissue structure. We investigated experimentally root tissue mass density, root diameter and several characteristics of root anatomy in the axile roots of 19 perennial grass species from different habitats and related these parameters to the ecological behaviour of the species. Root characteristics were assessed in new roots produced by mature plants grown under standardized conditions. The ecological behaviour was characterized in terms of relative growth rate (RGR), plant height at maturity and ecological indicator values for nutrients, light and tolerance to mowing according to Ellenberg. We found a striking dichotomy between root anatomical characteristics associated with interspecific variation in RGR and those associated with variation in plant height. RGR correlated with anatomical characteristics that contribute to root robustness, whereas plant height correlated with characteristics associated with axile root hydraulic conductance. RGR correlated negatively with tissue mass density (TMD r ) in roots. Interspecific variation in TMD r was explained by the proportion of stele in the cross-sectional area (CSA) of the axile root and the proportion of cell wall in the CSA of the stele. For a given root diameter, slow growing species had smaller, albeit more numerous, xylem vessels, indicating a higher resistance to cavitation and protection against embolisms. Plant height correlated positively with root CSA, total xylem CSA and mean xylem vessel CSA, indicating a need for a high transport capacity in roots of species that attain a large size at maturity. TMD r correlated positively with dry matter content in leaves. The results emphasize the close relationship between tissue structure and growth characteristics at the whole-plant level.

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Species differences in calcium and potassium distributions within plant roots

Cited by 19 publications

References 34 publications

Spatial distribution of solutes, K, Na, Ca and their deposition rates in the growth zone of primary cotton roots: Effects of NaCl and CaCl2

Spatial distribution of solutes, K, Na, Ca and their deposition rates in the growth zone of primary cotton roots: Effects of NaCl and CaCl2

Accumulation and Distribution Pattern of Large Amount of Potassium in Hyacinth Roots in Relation to Accompanying Anions

Root tissue structure is linked to ecological strategies of grasses

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