Studies on the physiological chemistry of dormancy and germination in Panax ginseng seeds, 2; Changes in abscisic acid content during stratification of seeds
1987
Choi, S.Y. | Lee, K.S. (Chonbuk National Univ., Chonju (Korea R.). Dept. of Agronomy)
Abscisic acid (ABA) content of the seed and endocarp during stratification was analyzed and then examined in relation to the embryo growth and germination. In mature red fruitlet, the ABA content was remarkably higher in sarcocarp than that in both seed and endocarp. During the stratification before dehiscence, ABA content was gradually decreased in both seed and endocarp. After 90 days (dehiscent percentage; 96%) it came to 90 pmol/gDW (69% decrease)and to 41 pmol/g DW (80% decrease) in seed and in endocarp, respectively. The ratio of free form to total ABA content showed constant decrease of ABA content and embryo growth showed higher significance in seed than in endocarp. During the stratification a1842fter dehiscence, ABA content in seed was gradually decreased at 4 deg C and 15 deg C, after 90 days it came to 28 pmol/g Dw (69% decrease) and to 46 pmol/g DW (49% decrease) at 4 deg C and at 15 deg C, respectively. The ratio of free form to total ABA content was gradually increased at 4 deg C, but remained almost constant at 15 deg C. Correlation between the decrease of ABA content and days to first germination showed positive singificance only at 4 deg C, whereas the correlation between the decrease and mean germination percentage per day showed negative significance at 4 deg C, but positive significance at 15 deg C. The above results indicate the ABA of the seed and endocarp during the stratification before dehiscence seems to be concerned with the immature embryo growth, but that of the seed during the stratification after dehiscence seems to show little effect on the germination capability (degree of breaking physiological dorma
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