植物硼的长距离运输

综述了硼在植物中长距离运输特别是韧皮部运输的研究进展，大多数植物中，硼主要通过木质部运输，但不排除在蒸腾作用较弱的部位，特别是缺硼胁迫时，韧皮部对硼运输起一定作用，而对于以山梨醇，甘露醇，半乳糖醇等多元醇为光合作用初级运输物的植物中，硼可以与多元醇形成络合物而在韧皮部中自由运输。硼是目前已知的在不同植物韧皮部中移动性相差最大的营养元素，韧皮部中硼运输基因型差异机制的深入研究可为改良植物硼的运输和再利用特性提供理论依据。

The Long-distance Transportation of Boron in Plants

The paper reviews the long-distance transport pathway and mechanisms of boron in plants, especially, in phloem. In major plant species, boron is delivered to growing regions generally via the xylem translocation pathway, however, phloem may play an considerable role in boron translocation to meet the demands of developing sink regions that do not readily transport, especially, under boron deficiency condition. But boron also exhibits rapid and significant phloem mobility in species for which sorbitol, mannitol, or dulcitol are the primary photosynthates since these polyols can effectively complex boron. Boron is unique among the essential element in that its phloem mobility varies dramatically among species.