Abstract
Cellulose biosynthesis inhibition (CBI) causes changes in root morphology and in the expression of genes. Recent studies revealed that CBI induces change in the amount of plant hormones. We have isolated a mutant of Arabidopsis (css1) that showed altered sensitivity to 2,6-dichlorobenzonitrile that inhibits cellulose biosynthesis. The css1 mutant also showed altered fundamental metabolism due to the defect in the mitochondrial function. The growth of this mutant was highly sensitive to sugar concentration of the medium (PCP 47:772-83(2006)). We tested ABA sensitivity of this mutant, since ABA strongly interacts with the growth regulatory effect of sugar. Our result showed that the post-germination growth of css1 mutant was more sensitive to ABA than that of wild type. We also determined mRNA levels of several ABA-related genes. The results indicated that not only post-germination growth but also mRNA levels of the genes were affected by css1 mutation.
