Effects of Applied Auxin and Gibberellin on Phloem and Xylem Production in Needle Leaves of Pinus

1985 ◽  
Vol 146 (4) ◽  
pp. 466-471 ◽  
Author(s):  
F. W. Ewers ◽  
Roni Aloni
Keyword(s):  
Applied Auxin

An investigation of angle-meristem development in excised stem segments of Selaginella martensii

1969 ◽  
Vol 47 (5) ◽  
pp. 717-722 ◽  
Author(s):  
T. R. Webster
Keyword(s):  
Early Development ◽  
Filter Paper ◽  
Shoot Tip ◽  
Intact Plant ◽  
Developmental Study ◽  
Distilled Water ◽  
Effective Factor ◽  
Meristem Development ◽  
Stem Segments ◽  
Applied Auxin

The development of dorsal and ventral angle-meristems in excised Y-shaped stem segments of Selaginella martensii grown on filter paper moistened with distilled water has been investigated. Based on the position of the branchings relative to the shoot tip on the intact plant, segments were designated as young, intermediate, or old. In most segments, with no auxin treatment, ventral angle-meristems formed shoots. In most young segments the dorsal angle-meristem formed a root, whereas most old segments formed a dorsal shoot. A developmental study suggests that (1) in young segments early development of a ventral shoot, controls development of the dorsal angle-meristem as a root, and (2) in old segments where both angle-meristems develop at approximately the same time, there is no ventral control over dorsal development, and a dorsal shoot results. Experiments with externally applied auxin suggest that auxin is an effective factor in controlling ventral angle-meristem development as a root.

Inhibition of Photoperiodic Induction in Xanthium by Applied Auxin

1949 ◽  
Vol 110 (4) ◽  
pp. 613-624 ◽  
Author(s):  
James Bonner ◽  
John Thurlow
Keyword(s):  
Photoperiodic Induction ◽  
Applied Auxin

scholarly journals Flower Stalk Segments of Arabidopsis thaliana Ecotype Columbia Lack the Capacity to Grow in Response to Exogenously Applied Auxin

2000 ◽  
Vol 41 (12) ◽  
pp. 1327-1333 ◽  
Author(s):  
Kouichi Soga ◽  
Kazuyuki Wakabayashi ◽  
Takayuki Hoson ◽  
Seiichiro Kamisaka
Keyword(s):  
Arabidopsis Thaliana ◽  
Flower Stalk ◽  
Applied Auxin

Adaptation of corn roots to exogenously applied auxin

1981 ◽  
Vol 51 (4) ◽  
pp. 394-398 ◽  
Author(s):  
Judy A. Gougler ◽  
Michael L. Evans
Keyword(s):  
Corn Roots ◽  
Applied Auxin

scholarly journals The effect of cambial zone isolation upon the autolytic system in maturing tracheids of pine (Pinus silvestris L.)

2014 ◽  
Vol 56 (3) ◽  
pp. 399-405 ◽  
Author(s):  
Jacek Zakrzewski ◽  
Krzysztof Rakowski
Keyword(s):  
Proteolytic Activity ◽  
Concentration Gradient ◽  
Specific Activity ◽  
Positional Information ◽  
Small Degree ◽  
Pinus Silvestris ◽  
Surgical Methods ◽  
Xylem Formation ◽  
Cambial Zone ◽  
Applied Auxin

The autolytic protease system in maturing tracheids of the main stem of <em>Pinus silvestris</em> was investigated after separation (using surgical methods) of the cambial zone from the layer of differentiating xylem, in combination with decapitation and IAA application. Separation of the cambium prevented autolysis of the protoplast in maturing tracheids, although the specific activity of proteases was little reduced. It was found that a radial or longitudinal concentration gradient of exogenously applied auxin was not responsible for autolysis, but that it could influence the level of extracted protein, and proteolytic activity. Similarly, decapitation modified, only to small degree, the effects of the cambium separation. Thus, the data from this experiment lead to the conclusion that integration of all cells in the region of xylem formation is a crucial factor for the start of autolytic protoplast breakdown. Possible involvement of auxin waves in the transfer of the positional information for this process is suggested.

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