Abstract
Although coloration in plants is ascribable to both the accumulation of anthocyanin pigments in vacuoles and to the acidification of vacuolar pH, the environmental factors causing the decrease in vacuolar pH are unknown. We found that blue-light irradiation of buckwheat seedlings using light-emitting diodes caused reddening on the surface of the hypocotyls. It has also been reported that light stimulation induces an accumulation of anthocyanin pigments. However, here we confirmed for the first time on the basis of real-time PCR analysis that light stimulation simultaneously triggers expression of the genes coding for subunit A of vacuolar H+-ATPase (V-ATPase) and vacuolar H(+)-pyrophosphatase (V-PPase).
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