Journal
PLANT PHYSIOLOGY
Volume 126, Issue 4, Pages 1698-1705Publisher
AMER SOC PLANT PHYSIOLOGISTS
DOI: 10.1104/pp.126.4.1698
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Boron (B) deficiency results in inhibition of pumpkin (Cucurbia moschata Duchesne) growth that is accompanied by swelling of the cell walls. Monomeric rhamnogalacturonan II (mRG-II) accounted for 80% to 90% of the total RG-II in B-deficient walls, whereas the borate ester cross-linked RG-II dimer (dRG-II-B) accounted for more than 80% of the RG-II in control plants. The results of glycosyl residue and glycosyl linkage composition analyses of the RG-II from control and B-deficient plants were similar. Thus, B deficiency does not alter the primary structure of RG-II. The addition of B-10-enriched boric acid to B-deficient plants resulted within 5 h in the conversion of mRG-II to dRG-II-B-10. The wall thickness of the B-10-treated plants and control plants was similar. The formation and possible functions of a borate ester cross-linked RG-II in the cell walls are discussed.
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