scholarly journals The Inactivity of 1-Docosanol in Some Plant Growth Tests in Relation to the Auxin of Maryland Mammoth tobacco

1962 ◽  
Vol 15 (2) ◽  
pp. 304 ◽  
Author(s):  
NP Kefford
Keyword(s):  
Nicotiana Tabacum ◽  
Plant Growth ◽  
Cell Extension ◽  
Avena Coleoptile ◽  
Indolylacetic Acid ◽  
Curvature Test

In extracts of shoots of Nicotiana tabacum cv. Maryland Mammoth, an auxin was detected with the same chromatographic properties as 3- indolylacetic acid (IAA). This auxin promoted cell extension in Avena coleoptile and first internode sections and was active in the Avena curvature test.

Regulation of isopentenoid biosynthesis by plant growth retardants in Nicotiana tabacum

1982 ◽  
Vol 21 (3) ◽  
pp. 575-579 ◽  
Author(s):  
W.David Nes ◽  
Trevor J. Douglas ◽  
Jiann-Tsyh Lin ◽  
Erich Heftmann ◽  
Leslie G. Paleg
Keyword(s):  
Nicotiana Tabacum ◽  
Plant Growth ◽  
Growth Retardants ◽  
Plant Growth Retardants

CHANGES IN LEAF PIGMENTS DURING SENESCENCE AND CURING OF FLUE-CURED TOBACCO

1984 ◽  
Vol 64 (1) ◽  
pp. 229-232 ◽  
Author(s):  
WILLIAM A. COURT ◽  
JOHN G. HENDEL
Keyword(s):  
Nicotiana Tabacum ◽  
Plant Growth ◽  
Chlorophyll A ◽  
Chlorophyll B ◽  
Nicotiana Tabacum L ◽  
Pigment Concentrations ◽  
Oxygen Substitution ◽  
Β Carotene ◽  
Carotenoid Degradation

Neoxanthin, violaxanthin, lutein, β-carotene, chlorophyll a and chlorophyll b in the leaves of flue-cured tobacco (Nicotiana tabacum L.) were determined in samples collected at intervals from the middle of July through harvest. Harvested leaves were also sampled at intervals during flue curing for pigment determinations. Except where interrupted by rainfall or irrigation, pigment concentrations progressively declined during plant growth; this degradation was accelerated during flue curing. Carotenoid degradation during flue curing was proportional to the degree of oxygen substitution of the carotenoid. Chlorophyll a and chlorophyll b in cured tissue were typically less than 1% of the amounts present at harvest.Key words: Carotenoids, chlorophyll, tobacco (flue-cured), flue curing, senescence

scholarly journals THE GROWTH AND RESPIRATION OF THE AVENA COLEOPTILE

1936 ◽  
Vol 20 (1) ◽  
pp. 1-11 ◽  
Author(s):  
James Bonner
Keyword(s):  
Growth Hormone ◽  
Plant Growth ◽  
Cell Elongation ◽  
Respiratory Quotient ◽  
Aerobic Metabolism ◽  
The Other ◽  
Small Magnitude ◽  
Mechanical Process ◽  
Avena Coleoptile ◽  
Plant Growth Hormone

1. Transport of the plant growth hormone into the Avena coleoptile as well as the action of the hormone on cell elongation in the coleoptile are shown to depend upon aerobic metabolism. 2. Crystalline auxine, in contrast with impure preparations, affects neither the magnitude nor the respiratory quotient of coleoptile respiration. 3. Increasing age of the coleoptile cell decreases its rate of elongation much more than its rate of respiration. HCN or phenylurethane on the other hand decrease the two processes to the same extent, in spite of the fact that only a small portion of the energy liberated by respiration can be used in the mechanical process of growth. 4. From 2 and 3 it is concluded that processes of a respiratory nature but of relatively small magnitude form one or more integral steps in the chain of reactions by which the plant growth hormone brings about cell elongation.

scholarly journals Effect of cytokinins on shoot apical meristem in Nicotiana tabacum

2012 ◽  
Vol 64 (2) ◽  
pp. 511-516 ◽  
Author(s):  
Branka Uzelac ◽  
Dusica Janosevic ◽  
Dragana Stojicic ◽  
Snezana Budimir
Keyword(s):  
Cell Proliferation ◽  
Cell Differentiation ◽  
Nicotiana Tabacum ◽  
Plant Growth ◽  
Shoot Apical Meristem ◽  
Apical Meristem ◽  
Mitotic Cell ◽  
Anatomical Changes ◽  
Cell Divisions ◽  
Exogenous Cytokinin

Cytokinins are involved in plant cell proliferation leading to plant growth and morphogenesis. The size, activity and maintenance of the shoot apical meristem (SAM) are defined by a balanced rate of mitotic cell divisions and functional cell differentiation that are controlled by cytokinins. In order to investigate the effect of exogenous cytokinin on SAM, morpho-anatomical changes in the shoot apices of tobacco treated with benzyladenine (BA) were compared to those of untreated control plants.

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