CHROMATOGRAPHIC DETECTION OF SEASONAL CHANGES IN THE LOCATION OF INDOLE-3-ACETIC ACID IN BALSAM FIR

1963 ◽  
Vol 41 (7) ◽  
pp. 1133-1134 ◽  
Author(s):  
J. M. Bonga ◽  
J. Clark
Keyword(s):  
Acetic Acid ◽  
Seasonal Changes ◽  
Balsam Fir ◽  
Chromatographic Detection ◽  
Indole 3 Acetic Acid

EVIDENCE FOR INDOLE-3-ACETIC ACID IN BALSAM FIR, ABIES BALSAMEA (L.) MILL.

1963 ◽  
Vol 41 (1) ◽  
pp. 165-173 ◽  
Author(s):  
J. Clark ◽  
J. M. Bonga
Keyword(s):  
Acetic Acid ◽  
Paper Chromatography ◽  
Abies Balsamea ◽  
Growth Inhibitor ◽  
Balsam Fir ◽  
Strong Growth ◽  
Inner Bark ◽  
Indole 3 Acetic Acid

An ether-extractable auxin was discovered in the inner bark of balsam fir. Characterization of the auxin by paper chromatography, Avena bioassay, and chromogenic tests indicates that it is indole-3-acetic acid. A strong growth inhibitor was extracted together with the auxin.

Seasonal Variations in Endogenous Indole-3-Acetic Acid and Abscisic Acid in the Cambial Region of Pinus densiflora Sieb. et Zucc. Stems in Relation to Earlywood-Latewood Transition and Cessation of Tracheid Production

Holzforschung ◽  
2001 ◽  
Vol 55 (2) ◽  
pp. 128-134 ◽  
Author(s):  
R. Funada ◽  
T. Kubo ◽  
M. Tabuchi ◽  
T. Sugiyama ◽  
M. Fushitani
Keyword(s):  
Acetic Acid ◽  
Abscisic Acid ◽  
Seasonal Changes ◽  
Pinus Densiflora ◽  
Growing Season ◽  
Cambial Activity ◽  
Early Summer ◽  
Indole 3 Acetic Acid ◽  
Lower Stem ◽  
Tracheid Production

Summary Seasonal changes in the total amount (measured as ng cm−2) of endogenous indole-3-acetic acid (IAA) and abscisic acid (ABA) in the cambial region of Pinus densiflora Sieb. et Zucc. trees with crowns of different sizes were determined at different stem heights. The total amount of IAA varied seasonally in all trees and at all stem positions, being maximal in early summer (May or July). In a tree with a large crown, the total amount of IAA remained high after peaking and declined in autumn, whereas in a tree with small crown it decreased rapidly after peaking, in particular in the lower stem. The transition from earlywood to latewood occurred concurrently with the decrease in the total amount of IAA after it had peaked, suggesting the involvement of IAA in the control of latewood formation. Cessation of the production of tracheids also paralleled the decline in the total amount of IAA early in the growing season in the lower stem of the tree with a small crown, but not in the tree with a large crown. Thus, other factors in addition to declining IAA seem to be involved in halting the production of the tracheids. The total amount of ABA was lower than that of IAA in all trees and at all stem heights, and changes were not correlated with specific changes during the annual cycle of cambial activity and dormancy.

Evaluation of Kinetic Parameters at the Transport of Indole-3-acetic Acid Through Bulk Liquid Membranes

2017 ◽  
Vol 68 (5) ◽  
pp. 903-907
Author(s):  
Ecaterina Anca Serban ◽  
Ioana Diaconu ◽  
Elena Ruse ◽  
Georgiana Ileana Badea ◽  
Adriana Cuciureanu ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Kinetic Parameters ◽  
Trioctylphosphine Oxide ◽  
Bulk Liquid ◽  
Transport Parameters ◽  
Kinetics Parameters ◽  
First Order ◽  
Phase Concentration ◽  
Feed Phase ◽  
Indole 3 Acetic Acid

Indole-3-acetic acid is a growth phytohormone considered the most important representative of auxin class. This paper presents the assessment of some kinetic parameters in the process of transport of indole-3-acetic acid taking into consideration the kinetic model of consecutive irreversible first order reactions. It was pursued the influence upon the process of parameters such as: feed phase concentration, stripping phase concentration in the presence of two type carriers: tributyl phosphate (TBP) and trioctylphosphine oxide (TOPO). Depending on these transport parameters were calculated kinetics parameters such as: pseudo-first-order apparent membrane entrance and exit rate constants, the maximum flux at the entrance and exit out of the membrane. The highest values of the transport flux is obtained in the presence of carrier trioctylphosphine oxide (TOPO) at the concentration in the feed phase of 10-4 mol/L indole-3-acetic acid and a concentration of 10--2mol/L NaOH in the stripping phase.

Sign in / Sign up

Export Citation Format

Share Document