摘要
研究结果表明,红麻(Hibisus cannabinus)各器官的含锰量是下位叶>中位叶>上位叶>麻根>麻皮>麻秆。麻株吸收的锰在形成纤维盛期前主要集中于叶部,尔后主要用于茎的发育。由超显微切片观察到,缺锰叶的叶绿体膨胀变圆,体积增大、衬质增多,各基粒排列混乱,膜系统发育不良,甚至瓦解。砂培试验中施用锰肥可增加叶片叶绿素a和b的含量及叶绿素a/b比值,可提高CO_2同化率和提高叶片硝酸还原酶的活性,促进蛋白质和核酸的生物合成及对氮的吸收和利用,还影响茎纤维细胞的分化和发育。对缺锰土壤施用锰肥(MnSO_4·H_2O)1.0kg/666m^2,可使红麻增产28.8％。
Field experiment showed that Mn contents in various organs of kenaf (Hibisus canna-binus ) varied in the following sequences, lower leaf>middle leaf>upper leaf>root>skin>stalk. The absorbed Mn was mainly present in leaves before the fiber accumulation stage. After this stage, the absorbed Mn was used for the development of stem. Ultrasection revealed that Mndeficient chloroplast tended to be expended in volume and round in shape, with the increase in its strama material. The grana were disorganized and its thylakoid membrance was poorly developed or even absent. Application of Mn increased the chla, chlb contents, the chl a/b ratio, and the CO2 assimilation rate. It stimulated the activity of nitrate-reducing enzyme, the synthesis of protein and nucleic acid, and the uptake and utilization of nitrogen, and affected the differentiation and development of stem fiber cells. Application of Mn fertilizer ( MnSO4·H2O ) 1.0 kg per mu ( in Mn deficient soil ) increased the yield of kenaf by 28.8%.
基金
国家自然科学基金
关键词
红麻
锰
植株
生理效应
分配
Hibisus cannabinus
Mn
chloroplasti nitrogen metabolism
fiber
