Tap root

Gum tragacanth is obtained from the large tap root and branches of a small perennial shmb found in the Middle East, especially Iran. Chemically, it is a mixture of water-insoluble polysaccharides. It is stable to heat, acidity, and aging, and is used extensively in pourable low calorie salad dressings. 

Wyse, R.E., Zamski, E. Tomos, A.D. (1986). Turgor regulation of sucrose transport in sugar beet tap root tissue. Plant Physiology, 81, 478-81. 

In soil, the chances that any enzyme will retain its activity are very slim indeed, because inactivation can occur by denaturation, microbial degradation, and sorption (61,62), although it is possible that sorption may protect an enzyme from microbial degradation or chemical hydrolysis and retain its activity. The nature of most enzymes, particularly size and charge characteristics, is such that they would have very low mobility in soils, so that if a secreted enzyme is to have any effect, it must operate close to the point of secretion and its substrate must be able to diffuse to the enzyme. Secretory acid phosphatase was found to be produced in response to P-deficiency stress by epidermal cells of the main tap roots of white lupin and in the cell walls and intercellular spaces of lateral roots (63). Such apoplastic phosphatase is safe from soil but can be effective only when presented with soluble organophosphates, which are often present in the soil. solution (64). However, because the phosphatase activity in the rhizo-sphere originates from a number of sources (65), mostly microbial, and is much higher in the rhizosphere than in bulk soil (66), it seems curious that plants would have a need to secrete phosphatase at all. 

The absence of a tap root in vegetatively propagated tea might conceivably represent a hazard during extended drought periods, but there is no documented evidence of such preferential damage to clonal tea. Biological identity also affords the possibility for widescale destruction as a... 

Remediation with plants requires that the contaminants be in contact with the root zone of the plants. Therefore, root morphology and depth directly affect the depth of soil that can be remediated or the depth of groundwater that can be influenced. A fibrous root system such as that found in grasses has numerous fine roots spread throughout the soil and provides maximum contact with the soil because of the high surface area of the roots. A tap root system (such as in alfalfa) is dominated... 

Trees. Phreatophyte roots will tend to extend deeper than other tree roots. Phreatophytic tree roots can reach as deep as 24 m (80 ft). Two examples are mesquite tap roots, which range from 12 to 30 m (40 to 100 ft), and river birch tap roots, which go to a depth of 27 to 30 m (90 to 100 ft). 

Isoform ofhGAD (hGAD65) CaMV 35S promoter/ nos terminator GAD67i-87(rat)/hGAD65s8-58s Fusion Expression mediated by potato virus X infection N. tabacum (leaves) Daucus carota (tap root) N. tabacum (leaves) N. benthamiana (leaves) 0.01-0.04% ofTSP 0.01% ofTSP 0.04% ofTSP 0.19% ofTSP 2.2% ofTSP 39 40... 

Early Devonian paleosols have abundant traces of true roots, including woody tap roots of a variety... 

Classification, of Roots as to Form.—i. Primary or first root, a direct downward growth from the seed, which, if greatly in excess of the lateral roots, is called the main or tap root. Examples Taraxacum, Radish. 

Napiform, or turnip-shaped, somewhat globular and becoming abruptly slender then terminating in a conical tap root, as the roots of the turnip. 

Tap-Root.—The main root coursing directly downward. 

Later rootfets farm, fiom main tap root... 

Herbicidal soaps are most effective on young weeds with tender lenf tissue. They are not very effective against mature perennial weeds, especially those with tap roots. Spray on weeds according to label directions. 

Common cocklebur is broad leaved and tap rooted. Stems are erect, ridged, rough and hairy, and frequently branched, resulting in somewhat bushy plants. It has small, green flowers occurring... 

Mars passes through the zodiac every two years and this sign was formerly used for biennials. The plants possess thorns, spines or prickles, grow in dry harsh areas and have acrid, pungent or stimulating odours for example. Raspberry or Red Pepper. They have a comical root (tap root) for example. Carrot, Beet. 

Effects of brassinosteroids on the activity of acid invertase in tap-root. The next question to be considered was whether such a relationship may also be valid for increases in the amount of tap-root dry matter after application of SSHB. Table V shows these data for the roots. There is a close correlation between increases in root dry matter and the activity in acid invertase after application of SSHB. This may be... 

Table V, Effect of SSHB on sugar-beet tap-root growth and activity of acid invertase and sucrose synthase...

Treatment Dry Mass of Roots Enzyme Activity in Tap-Roots at Time of... 

Effects of brassinosteroids on the activity of sucrose synthase in tap-roots. Finally, we had to consider the effect of homobrassinolide application on sugar content and sugar yield. It is inferred from Table II that both characteristics were increased only in the case of high drought stress which may be explained by increased activity of sucrose synthase as a consequence of SSHB application. Sucrose synthase is a key enzyme in the root storage of sugar-beet plants and this enzyme is able to synthesize sucrose (6). 

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