Endogenous inhibitors and seasonal changes in abscisic acid in Dioscorea floribunda Mart. & Gal.

1989 ◽  
Vol 8 (3) ◽  
pp. 225-232 ◽  
Author(s):  
A. H. Abad Farooqi ◽  
Y. N. Shukla ◽  
Srikant Sharma ◽  
F. Bangerth
Keyword(s):  
Abscisic Acid ◽  
Seasonal Changes ◽  
Endogenous Inhibitors ◽  
Dioscorea Floribunda

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.

Spreading the Word: Seasonal Changes Mean New Opportunities for Media Coverage

ASHA Leader ◽  
2013 ◽  
Vol 18 (7) ◽  
Keyword(s):  
Media Coverage ◽  
Seasonal Changes ◽  
Swimming Pools

Summer kicking into high gear conjures images of swimming pools and barbeques. But before you book your beach house for the weekend, think about what the changing seasons can mean for you professionally.

Seasonal changes in a ultraviolet structural colour signal in blue tits, Parus caeruleus

2002 ◽  
Vol 76 (2) ◽  
pp. 237-245 ◽  
Author(s):  
JONAS ORNBORG ◽  
STAFFAN ANDERSSON ◽  
SIMON C. GRIFFITH ◽  
BEN C. SHELDON
Keyword(s):  
Seasonal Changes ◽  
Parus Caeruleus ◽  
Structural Colour ◽  
Blue Tits ◽  
Colour Signal
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