文档介绍：顶端调控对烤烟生长、主要矿质养分吸收和分配特性的影响
杨怀玉,李春俭
(中国农业大学植物营养系/农业部植物营养与养分循环重点开放实验室/教育部植物-土壤相互作用重点实验室,北京 100094)
摘要:【目的】揭示顶端调控对烤烟生长、矿质养分吸收和分配影响。【方法】采用营养液培养,结合根系养分吸收动力学方法,进行了打顶和打顶+NAA处理。【结果】对照在处理期间干物质和养分净增量最大,干物质的57%和N、P、K、Ca等养分的44%~68%分配到了顶端(包括新生叶片),而打顶和打顶+NAA植株的干物质和养分净增量的绝大部分都分配至上部叶和根系。钾离子吸收动力学结果表明,根系吸钾速率大小依次为对照>打顶+NAA>打顶,对照植株根系对钾离子的亲和力和最大吸收速率也最大。打顶+NAA处理2 d后根系对钾离子的亲和力和最大吸收速率均大于打顶处理。【结论】以上结果表明,顶端不仅可以通过其生长需求(库强)调节光合产物和矿质养分在体内的分配,而且可以通过其合成的生长素调控根系的养分吸收。打顶后生长调节剂处理可一定程度上代替顶端的作用。
关键词:烤烟;打顶;萘乙酸;钾;吸收动力学
Shoot Apex Regulates Growth, Nutrients Absorption and
Distribution Within o Plants
YANG Huai-yu, LI Chun-jian
(Department of Plant Nutrition, China Agricultural University / Key Laboratory of Plant Nutrient and Nutrient Cycle,
Ministry of Agriculture / Key Laboratory of Plant-Soil Interactions, Ministry of Education, Beijing 100094)
Abstract: 【Objective】Effects of decapitation on plant growth, nutrients absorption and distributionwithin plant, as well as potassium (K) absorption dynamic and ics in o plants were examined. 【Method】A root nutrients absorption ic method was applied under hydroponic culture.【Result】The results showed that in the control plant, 57% of dry matter gain and 44%-68% of increase in mineral nutrients (including N, P, K, Ca, etc.) was deposited in the top. In the decapitation and decapitation+NAA plants, the majority of increases in dry matter and nutrients were al