Boron Nutrition and Boron Application in Crops
Boron Nutrition and Boron Application in Crops
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DOI：
10.1007/978-1-4020-5382-5_16
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发表时间：
2007
期刊：
影响因子：
9.2
通讯作者：
Timothy E. Smith
中科院分区：
文献类型：
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作者：
Timothy E. Smith
顶端优势是指生长旺盛的茎尖对侧枝的抑制作用。这种顶端优势的机制通常被认为是通过生长素的极性流动，最明显的是吲哚乙酸（IAA），在茎尖和幼叶中合成（Li et al. 2001）。硼缺乏导致许多物种顶端优势的丧失（Marschner，1995; Smith 2004），但B在顶端优势中的直接作用不太确定。然而，已经表明B在初生细胞壁中果胶网络的鼠李糖半乳糖醛酸聚糖II（RGII）区域中形成硼酸酯-二酯键中起特定作用（石井和Matsunaga，1996年;小林等人，1996年;奥尼尔等人，1996年），以及当豌豆中的B供应被抑制时，在豌豆（Pisum sativum）植物中，在顶端伸长下降之前，茎尖的IAA输出急剧减少，并且茎尖和根尖中的IAA浓度下降（Li等人，2001）。
Apical dominance is the suppression of lateral shoots by a robustly growing shoot apex. The mechanism for this apical dominance is generally accepted to be through the polar flow of auxins, most notably indoleacetic acid (IAA), synthesized in the shoot apex and young leaves (Li et al. 2001).Boron deficiency has caused loss of apical dominance in a number of species (Marschner, 1995; Smith 2004), but the direct role of B in apical dominance is less certain. However, it has been shown that B performs a specific role in forming borate-diester bonds in the rhamnogalacturonan II (RGII) region of the pectin network in the primary cell wall (Ishii and Matsunaga, 1996; Kobayashi et al. 1996; O’Neill, et al. 1996) and that when B supply was withheld in pea (Pisum sativum) plants, there was a dramatic decrease in IAA export out of the shoot apex and a decline in IAA concentrations in the shoot and root apices, prior to a decline in elongation of the apex (Li et al. 2001).