The Hormonal Control of Cell Wall Turnover in Pisum Sativum L.

SUMMARY A tentative structure for the polysaccharides of pea epicotyl cell walls is presented. The turnover of these polysaccharides has been followed by gravimetric and pulse chase studies. It is suggested that an important effect of IAA is the promotion of turnover in certain wall hemi‐celluloses, notably xyloglucan; moreover, such turnover appears to be inhibited by kinetin. The relevance of these findings is discussed in terms of longitudinal and lateral cell expansion.