Hypothetical model depicting the effects of water deficit stress on carbon flow between raffinose family oligosaccharides and O-methyl-inositol in carbohydrate metabolism in green photosynthetic tissues of mature variegated coleus source leaves. 1, Myoinositol-1-P synthase; 2, myoinositol-1-P phosphatase; 3, galactinol synthase; 4, stachyose synthase; 5, myoinositol 6-O-methyltransferase.