
TY  - JOUR
A1  - Yoshiyama, M 
A1  - Yajima, H 
A1  - Atsumi, T 
A1  - Esashi, Y 
T1  - Mechanism of Action of C<sub>2</sub>H<sub>4</sub> in Promoting the Germination of Cocklebur Seeds. II. The Role of C<sub>2</sub>H<sub>4</sub> in the Enhancement of Priming Effects
JF  - Functional Plant Biology
JO  - Functional Plant Biol.
Y1  - 1996
VL  - 23
IS  - 2
SP  - 133
EP  - 139
KW  - 
UR  - https://doi.org/10.1071/PP9960133 
N2  - In cocklebur (Xanthium pennsylvanicum Wallr.) seeds, the pre-exposure to water stress imposed by polyethylene glycol or mannitol (seed priming) increased osmotic pressure (OP) in cell saps and water extracts. Carbohydrates were the major components and soluble proteins also played a partial role as an osmoregulator in the primed seeds. C2H4, which was effective in stimulating the growth of both axial and cotyledonary tissues even under water-stressed conditions, changed the amino acid pool size regardless of water stress. This C2H4-induced amino acid accumulation also occurred under anoxic conditions. CO2 was capable of stimulating growth of axial tissues but it did not increase OP values or carbohydrate and amino acid contents. The effectiveness of seed primlng gradually declined with increasing duration of presoaking, but C2H4 prevented the reduction of the priming effect by effectively maintaining the amino acid levels. Thus, it is likely that C2H4 contributes to the enhancement of the priming effect by abundantly supplying amino acids. 
ER  -

