scholarly journals Changes with Aging of Endogenous Abscisic Acid and Zeatin Riboside in the Root System of Rice.

1996 ◽  
Vol 65 (4) ◽  
pp. 686-692 ◽  
Author(s):  
Kang Su KWAK ◽  
Morio IIJIMA ◽  
Akira YAMAUCHI ◽  
Yasuhiro KONO
Keyword(s):  
Abscisic Acid ◽  
Root System ◽  
Zeatin Riboside ◽  
Endogenous Abscisic Acid

Abscisic Acid and Cytokinins as Possible Root-to-Shoot Signals in Xylem Sap of Rice Plants in Drying Soil

1993 ◽  
Vol 20 (1) ◽  
pp. 109 ◽  
Author(s):  
A Bano ◽  
K Dorffling ◽  
D Bettin ◽  
H Hahn
Keyword(s):  
Abscisic Acid ◽  
Stomatal Conductance ◽  
Water Potential ◽  
Root System ◽  
Nutrient Solution ◽  
Xylem Sap ◽  
Zeatin Riboside ◽  
Stem Water Potential ◽  
Rice Plants ◽  
Stem Water

Seedlings of rice cv. IR 36 were grown in soil in small pots with a horizontally divided root system: after 6-7 weeks, about 20% of the entire root system had protruded through the holes at the base of the pots and was kept in contact with nutrient solution. At this stage the plants were exposed to three different treatments: (a) the soil was kept watered and the protruding free roots were dried in air; (b) the free roots were kept moist and the soil left unwatered; (c) both soil and protruding roots were left unwatered for 30 h and then rewatered. During the first hours of treatment a and b, a decline in stomatal conductance was observed, whereas the stem water potential remained unchanged. The concentration of abscisic acid (ABA) in the xylem, however, increased. At later stages of treatment a and b, the stem water potential began to decrease with a parallel further increase of xylem ABA. Xylem sap contained considerable amounts of bound ABA, the level of which increased during total root drying and decreased again after rewatering. Level of cytokinins, zeatin (t-Z)+zeatin riboside (t-ZR) and isopentenyladenine (2iP) + isopentenyladenosine (2iPA), on the contrary, decreased during root drying and increased again after rewatering. The results are discussed with regard to a possible function of ABA and cytokinins as root-to-shoot signals.

scholarly journals Involvement of Endogenous Abscisic Acid in Onset and Release of Helianthus annuus Embryo Dormancy

1990 ◽  
Vol 92 (4) ◽  
pp. 1164-1168 ◽  
Author(s):  
Marie-Thérèse Le Page-Degivry ◽  
Philippe Barthe ◽  
Ginette Garello
Keyword(s):  
Abscisic Acid ◽  
Helianthus Annuus ◽  
Endogenous Abscisic Acid ◽  
Embryo Dormancy

Seed Development in the Recalcitrant SpeciesQuercus roburL: Water Status and Endogenous Abscisic Acid Levels

1992 ◽  
Vol 43 (5) ◽  
pp. 671-679 ◽  
Author(s):  
W. E. FINCH-SAVAGE ◽  
H A. CLAY ◽  
P S. BLAKE ◽  
G. BROWNING
Keyword(s):  
Abscisic Acid ◽  
Seed Development ◽  
Water Status ◽  
Endogenous Abscisic Acid
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