果胶中鼠李糖半乳糖醛酸聚糖II-硼酸盐二聚体的形成决定了南瓜组织的细胞壁厚度。
Formation of rhamnogalacturonan II-borate dimer in pectin determines cell wall thickness of pumpkin tissue.
作者信息
Ishii T, Matsunaga T, Hayashi N
机构信息
Forestry and Forest Products Research Institute, P.O. Box 16, Tsukuba Norin Kenkyu Danchinai, Ibaraki 305-8687, Japan.
出版信息
Plant Physiol. 2001 Aug;126(4):1698-705. doi: 10.1104/pp.126.4.1698.
Abstract
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 (10)B-enriched boric acid to B-deficient plants resulted within 5 h in the conversion of mRG-II to dRG-II-(10)B. The wall thickness of the (10)B-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.
摘要
硼（B）缺乏会导致南瓜（西葫芦）生长受到抑制，并伴有细胞壁肿胀。在缺硼细胞壁中，单体鼠李半乳糖醛酸聚糖II（mRG-II）占总RG-II的80%至90%，而在对照植物中，硼酸酯交联的RG-II二聚体（dRG-II-B）占RG-II的80%以上。对照植物和缺硼植物中RG-II的糖基残基和糖基连接组成分析结果相似。因此，缺硼不会改变RG-II的一级结构。向缺硼植物添加富含（10）B的硼酸会在5小时内导致mRG-II转化为dRG-II-（10）B。（10）B处理植物和对照植物的细胞壁厚度相似。本文讨论了细胞壁中硼酸酯交联RG-II的形成及其可能的功能。
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