UPTAKE OF 51Cr AS AN INDICATOR OF METABOLIC CHANGE IN WHEAT ROOT TIPS

1967 ◽  
Vol 45 (2) ◽  
pp. 235-239 ◽  
Author(s):  
Geneviève Bourque ◽  
P. Vittorio ◽  
Pearl Weinberger
Keyword(s):  
Wheat Root ◽  
Consistent Pattern ◽  
Metabolic Change ◽  
Sensitive Indicator ◽  
Clear Indication ◽  
Serial Sections ◽  
Root Tips ◽  
Metabolic State ◽  
Mode Of Entry ◽  
Cr Uptake

A consistent pattern of 51Cr incorporation was observed in serial sections of the roots of two varieties of wheat, both vernalized and unvernalized. The changed metabolic state attendant on vernalization was reflected by a higher level of 51Cr incorporation. A clear indication was given that 51Cr uptake can be used as a sensitive indicator of metabolic change in wheat root tips.The mode of entry and binding of the trivalent and hexavalent forms of chromium was also investigated.

The dieca effect in the respiration of barley

1957 ◽  
Vol 147 (928) ◽  
pp. 309-315 ◽  
Keyword(s):  
Related Species ◽  
Oxidation Mechanism ◽  
Wheat Root ◽  
Barley Root ◽  
Root Tips ◽  
Full Agreement ◽  
Salt Uptake ◽  
System A ◽  
Simultaneous Comparison ◽  
Independent Work

Results previously described for the respiration of barley root tips lead to the conclusion that their cytochrome system temporarily gives way to a copper-dependent system a few days after germination. Independent work with related species does not suggest similar effects. A simultaneous comparison of barley and wheat root tips has therefore been carried out and has given results in full agreement with previous work for both species. The change, referred to here as ‘the dieca effect’, occurs in barley and not in wheat. It indicates that a drastic alteration of oxidation mechanism may occur in a rapidly growing tissue without apparent disturbance to growth or salt uptake by the tissue.

scholarly journals Intracellular pH in rice and wheat root tips under hypoxic and anoxic conditions

2008 ◽  
Vol 3 (4) ◽  
pp. 240-242 ◽  
Author(s):  
Konstantin Y. Kulichikhin ◽  
Tamara V. Chirkova ◽  
Kurt V. Fagerstedt
Keyword(s):  
Intracellular Ph ◽  
Wheat Root ◽  
Root Tips ◽  
Anoxic Conditions

Wheat root penetration and total available water on a range of soil types

1976 ◽  
Vol 16 (81) ◽  
pp. 570 ◽  
Author(s):  
D Tennant
Keyword(s):  
Shallow Water ◽  
Soil Water ◽  
Western Australia ◽  
Sandy Loam ◽  
Soil Surface ◽  
Wheat Root ◽  
Consistent Pattern ◽  
Clay Soils ◽  
Soil Types ◽  
Root Penetration

Depth of root penetration was examined over three years on a range of soil types in Western Australia. A consistent pattern was recognized. Roots penetrated rapidly to 5 to 10 cm from the soil surface within the first week from planting. Subsequent penetration was slow to 6 weeks, at which stage, depending on soil types, depth of root penetration was 15 to 30 cm. Rates of root penetration increased after 6 weeks from planting with greatest penetration occurring between 8 to 13 weeks. Respective maximum depths of root penetration in the deep sand, sandy loam, grey clay and sand over clay soils investigated were 169, 173, 31 and 73 cm. These depths were reached between 10 to 14 weeks after planting. Potential available soil water to maximum depths of root penetration were 2.6, 20.1, 5.6 and 8.1 cm for the deep sand, sandy loam, grey clay and sand over clay respectively. More than half of this available soil water was accessible for crop exploitation over the 9 to 14 week period after planting, except with shallow water and root penetration in the grey clay.

scholarly journals The varied functions of aluminium-activated malate transporters–much more than aluminium resistance

2016 ◽  
Vol 44 (3) ◽  
pp. 856-862 ◽  
Author(s):  
Antony J. Palmer ◽  
Alison Baker ◽  
Stephen P. Muench
Keyword(s):  
Wheat Root ◽  
Aminobutyric Acid ◽  
Signal Transducer ◽  
Root Tips ◽  
Transporter Family ◽  
Economically Valuable Traits ◽  
Aluminium Resistance ◽  
Functionally Diverse ◽  
Different Tissues ◽  
Malate Transporter

The ALMT (aluminium-activated malate transporter) family comprises a functionally diverse but structurally similar group of ion channels. They are found ubiquitously in plant species, expressed throughout different tissues, and located in either the plasma membrane or tonoplast. The first family member identified was TaALMT1, discovered in wheat root tips, which was found to be involved in aluminium resistance by means of malate exudation into the soil. However, since this discovery other family members have been shown to have many other functions such as roles in stomatal opening, general anionic homoeostasis, and in economically valuable traits such as fruit flavour. Recent evidence has also shown that ALMT proteins can act as key molecular actors in GABA (γ-aminobutyric acid) signalling, the first evidence that GABA can act as a signal transducer in plants.

Freeze-Etched Surfaces of Membranes and Organelles in the Cells of Pea Root Tips

1968 ◽  
Vol 3 (2) ◽  
pp. 199-206
Author(s):  
D. H. NORTHCOTE ◽  
D. R. LEWIS
Keyword(s):  
Characteristic Surface ◽  
Clear Indication ◽  
Cell Wall Formation ◽  
Root Tips ◽  
Nuclear Pores ◽  
Surface Appearance ◽  
Golgi Bodies ◽  
Surface Areas ◽  
Cytoplasmic Surface ◽  
Microfibrillar Structure

The structure of the inner and outer surfaces of the plasmalemma, the tonoplast and the membranes of the nucleus and endoplasmic reticulum have been investigated. The structure of the plasmalemma probably varies with the metabolic state of the cell, in particular with the synthesis and transport of material for cell-wall formation. The organization of the plasmalemma during the deposition of material in the wall by reverse pinocytosis is shown, and evidence is presented for the possible synthesis of the microfibrillar structure of the wall by synthetic units arranged as particles on and near the plasmalemma surface. A clear indication of substructure along the length of microtubules has been shown, and since views of large surface areas are possible the distribution of the microtubules at the cytoplasmic surface inside the plasmalemma has been revealed; they bound the cell by running around the circumference in one direction only. A definite organization of nuclear pores has been observed and the structure and shape of the pores is described. By the freeze-etch technique it is possible to investigate crystal-containing bodies, amyloplasts with starch grains and bundles of fibres in addition to mitochondria and Golgi bodies. The method also distinguishes certain spherical organelles by their characteristic surface appearance.

Effects of the herbicide dithiopyr on cell division in wheat root tips

1991 ◽  
Vol 39 (2) ◽  
pp. 110-120 ◽  
Author(s):  
Barbara L. Armbruster ◽  
William T. Molin ◽  
M.Wayne Bugg
Keyword(s):  
Cell Division ◽  
Wheat Root ◽  
Root Tips
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