Beet Root
Mostrando 13-24 de 46 artigos, teses e dissertações.
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13. Responses of Sugar Beet Roots to Iron Deficiency. Changes in Carbon Assimilation and Oxygen Use1
Different root parts with or without increased iron-reducing activities have been studied in iron-deficient and iron-sufficient control sugar beet (Beta vulgaris L. Monohil hybrid). The distal root parts of iron-deficient plants, 0 to 5 mm from the root apex, were capable to reduce Fe(III)-chelates and contained concentrations of flavins near 700 μm, two ch
American Society of Plant Physiologists.
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14. Freezing of Nonwoody Plant Tissues: I. Effect of Rate of Cooling on Damage to Frozen Beet Root Sections 123
Small cylinders of red beet (Beta vulgaris) root were frozen at various rates. Ultraslow cooling at 0.2 C per hour to −4 C produced little damage, as determined by leakage of pigment and electrolytes, and softening. All of these increased at faster rates of cooling or at lower temperatures. Cooling at the ultraslow rate appears to induce extracellular free
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15. Sucrose Uptake by Sugar Beet Tap Root Tissue 1
Sucrose uptake by discs of mature sugar beet root tissue incubated in [14C]-sucrose exhibited nonsaturating kinetics over the concentration range of 1 to 500 millimolar. Uptake was inhibited by dinitrophenol, sodium cyanide, low O2, and penetrating sulfhydryl inhibitors. ATPase inhibitors, sodium fluoride, and oligomycin reduced uptake by 20 and 40%, respect
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16. Partial Purification of Digitonin-Solubilized β-Glucan Synthase from Red Beet Root 1
An enriched glucan synthase fraction was obtained from red beet root microsomes by sequential extraction with the detergents 3-[(3-cholamidopropyl)dimethylammonio]-1-propanesulfonate and digitonin. The digitonin suspension was centrifuged on a glycerol gradient, where a glucan synthase peak with a specific activity of 30- to 40-fold over microsomes was recov
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17. ATP Levels and their Effects on Plasmalemma Influxes of Potassium Chloride in Red Beet 1
Tissue ATP concentrations in slices of red beet increase progressively with time for up to 7 days after cutting the root. ATP levels are higher in slices taken from stored roots than in slices from fresh roots. ATP is reduced during incubation in salt solutions.
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18. Some properties of phloem exudate collected from root of sugar beet 1
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19. Regulation of Betacyanin Efflux from Beet Root by Poly-L-Lysine, Ca-Ion and Other Substances
Poly-l-lysine, poly-α, γ-diaminobutyric acid and basic proteins cause efflux of betacyanin from beet root tissues to varying degrees. Membrane activities fall in the order: polylysine > poly-α, γ-diaminobutyric acid > polyarginine (protamine), suggesting the importance of steric factors in side-chain to backbone relations. It was also observed that homop
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20. Regulation of Plasma Membrane β-Glucan Synthase from Red Beet Root by Phospholipids 1: Reactivation of Triton X-100 Extracted Glucan Synthase by Phospholipids
Extraction of red beet root plasma membranes with the detergent Triton X-100 at a level of 2.0% (weight/volume) resulted in the depletion of over 90% of total membrane phospholipid and the reduction of glucan synthase activity by 80 to 90%. Reconstitution of the delipidated Triton X-100, 100,000g fraction in the presence of phospholipids restored glucan synt
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21. Fast-Growing, Aerobic, Heterotrophic Bacteria from the Rhizosphere of Young Sugar Beet Plants
Fast-growing, aerobic, heterotrophic bacteria from the root surface of young sugar beet plants were inventoried. Isolation of the most abundant bacteria from the root surface of each of 1,100 plants between the second and tenth leaf stage yielded 5,600 isolates. These plants originated from different fields in Belgium and Spain. All isolates were characteriz
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22. Enzymes Involved in the Postharvest Degradation of Sucrose in Beta vulgaris L. Root Tissue 1
The reducing sugar content of sugar beet (Beta vulgaris L.) roots increased during 30 days of storage at 21 C and 160 days at 5 C as a result of an increase in acid invertase activity. Sucrose synthetase and neutral invertase activities were high at harvest but declined during storage, thus showing no relationship with postharvest reducing sugar accumulation
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23. Alkali Cation/Sucrose Co-transport in the Root Sink of Sugar Beet 1
The mechanism of sucrose transport into the vacuole of root parenchyma cells of sugar beet was investigated using discs of intact tissue. Active sucrose uptake was evident only at the tonoplast. Sucrose caused a transient 8.3 millivolts depolarization of the membrane potential, suggesting an ion co-transport mechanism. Sucrose also stimulated net proton effl
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24. Interaction of Rubidium or Sodium with Potassium in Absorption by Intact Sugar Beet Plants
This study concerns the selective absorption of K and Rb or of K and Na by intact sugar beet (Beta vulgaris) plants from modified conventional nutrient solutions over an extended period of plant growth. Long term results agreed with those of short term experiments by other investigators using excised root systems and simple salt solutions. Potassium and Rb w