【摘要】 采用砂培法研究不同硼浓度处理对烤烟碳氮代谢的影响。结果表明,低浓度硼(5μmol/LH3BO3)处理下,烟株各器官中的硼、氮、钾、干物质积累以及NO3-的吸收及同化受阻,叶片中的NH4+积累增加,而氨基酸和蛋白质含量降低;缺硼还降低烟株叶片的光合速率,并使叶片中的水溶性葡萄糖、果糖、蔗糖、淀粉大量积累。增加硼的供给(20μmol/L和40μmol/L),使烟株叶片碳氮代谢增强,植株各器官的氮、钾、硼含量增加,干物质积累增强。更多还原

【Abstract】 Effect of boron on carbohydrate and nitrogen metabolism was investigated with sand cultural technology in the greenhouse.The results showed that boron deficiency(5 μmol/L H3BO3)caused significantly decrease for the accumulation of boron,nitrogen,potassium and dry matter in tobacco plant organs,and decreased NO3-absorption by plants,nitrogen metabolism in the plants,which induced the decreases of amino acid and protein in the leaves,and a increase of NH4+ content in the leaves.Moreover,boron-deficient tobacco plants had lower photosynthetic rates.Higher content of glucose,fructose,sucrose and starch were founded in the leaves of plants treated with 5 μmol/L H3BO3,suggested that boron deficiency would depressed sugar transport from leaves to other parts.As the increase of boron supplication(20,40 μmol/L H3BO3)the tobacco plant ability of both carbohydrate metabolism and accumulation of dry matter enhanced,and the contents of nitrogen,potassium and boron increased.更多还原