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

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 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.

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

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.

Changes in nitrogen metabolism in the wheat root tip following growth and vernalization

1970 ◽  
Vol 48 (4) ◽  
pp. 671-681 ◽  
Author(s):  
Geneviève Ste-Marie ◽  
Pearl Weinberger
Keyword(s):  
Glutamic Acid ◽  
Wheat Root ◽  
Alanine Transaminase ◽  
Developmental Changes ◽  
Root Tip ◽  
Acid Fraction ◽  
Root Tips ◽  
Acid Incorporation ◽  
Control Root ◽  
And Control

Sequential changes in the alcohol-soluble amino acid fraction of vernalized and control root tips of Triticum aestivum var. Marquis (spring) and Rideau (winter) wheats have been followed. Substantial changes in this fraction could be related to developmental changes in the root tip, with protein synthesis occurring most rapidly in the region of elongation. Vernalization superimposed additional, consistent changes mainly in the content of asparagine, glutamine, glycine, and glutamic acid. Incorporation studies using 14C-glutamic acid and aspartic acid served to emphasize the distinct metabolic differences between the mitotic and elongating regions of the root tips. The activity of glutamic acid – alanine transaminase was also studied.

scholarly journals The relationship of root-cap slimes to proteins

1974 ◽  
Vol 139 (3) ◽  
pp. 525-534 ◽  
Author(s):  
Kenneth Wright ◽  
D. H. Northcote
Keyword(s):  
Chemical Characteristic ◽  
Wheat Root ◽  
Root Cap ◽  
Water Soluble ◽  
Maize Root ◽  
Root Tip ◽  
Root Tips ◽  
Maize Roots ◽  
Neutral Sugars ◽  
Relationship Of

1. The patterns of incorporation of radioactivity from d-[U-14C]glucose into the pectic components of sections of sycamore roots changed so that sections nearer the tip incorporated relatively more label into arabinose and galactose compared with uronic acid. 2. Radioactive maize root-cap slime was prepared and found to contain three water-soluble component polymers which were electrophoretically (i) neutral, (ii) weakly acidic and (iii) strongly acidic at pH6.5. The neutral component was a glucan. The other components, which could be degraded by trans-elimination, consisted of an acidic backbone chain composed of galacturonic acid and glucose, attached to which were different proportions of neutral sugars. Arabinose, galactose and fucose, the main neutral sugars of the weakly and strongly acidic materials, were absent from the neutral fraction. 3. Fucose was a major sugar in maize-root slime and in a slime of similar composition synthesized by a maize callus of shoot origin. Only trace amounts were found in sycamore, pea and wheat root tips, and in pectin prepared from maize roots and coleoptiles. A high proportion of fucose is therefore a chemical characteristic of maize slime, and slime synthesis indicated a state of differentiation of the tissue. 4. The similarity between the slime and pectin is discussed; slime is a form of pectin modified in such a way as to provide a hydrated protective coating around the root tip.

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