Acid ph-induced structural changes in cell wall xyloglucans In Vigna angularis epicotyl segments
Nishitani K, Masuda Y
Plant Sci Letters 28: 87-94
Acid pH, like indole-3-acetic acid (IAA), induced a decrease in the mass-average molecular weight (MW) of xyloglucans in the hemicellulose graction when it induced cell wall loosening and cell extension of epicotyl segments of light-grown Vigna angularis Ohwi et Ohashi cv. Takara seedlings. The effect of acid pH on the xyloglucan appeared without a lag period and the molecular weight decreased linearly with time in acidic pH solution. This effect of acid pH on the xyloglucan was completely reversed by subsequent treatment with neutral pH solution. These findings are consistent with the acid-growth theory of auxin and provide further evidence that the decrease in the mass-average MW of the cell wall xyloglucans is involved in the critical process responsible for the auxin-induced cell extension growth.