水分胁迫对槟榔幼苗根系形态与活力的影响  

Effects of Water Stress to Morphology and Activity of Root in Seedling of Areca catechu L.

作　　者：李洪立[1] 李琼[1] 杨福孙[2] 何云[1] 申志斌[1] 

机构地区：[1]中国热带农业科学院热带作物品种资源研究所,海南儋州571737 [2]海南大学农学院,海南儋州571737

出　　处：《热带作物学报》2011年第11期2016-2019,共4页Chinese Journal of Tropical Crops

基　　金：海南省教育厅高等学校科学研究指导性项目(No.Hj2009-18)

摘　　要：以槟榔为试验材料，采用盆栽法研究土壤不同相对含水量对槟榔幼苗根系形态和部分生理特性的影响。结果表明：（1）干旱处理使槟榔根系生物量及根冠比增加，叶片生物量下降．各器官中水分含量差异不显著。（2）干旱处理主要影响槟榔根系的数量、长度和粗度，从而影响根系表面积与体积，主要表现为：根K为0～5cm的根系数量及单株总根数降低，根长大于10cm的根系数量增加：根系表面积及根系体积在不同根段均以正常处理最高，而根系表面积大于6cm2和根系体积大于0．5cm3根段随水分含量的增加均呈下降趋势。（3）干旱处理对槟榔根系活力的影响为前期大于后期．随干旱程度的增加．根系活力下降越大。此结果表明槟榔主要通过调整根系数量、长度及粗度来适应干旱的环境条件．但干旱又明显抑制了槟榔的生长．Pot experiments was used to study the effects of different relative water content of soils to the root morphology and partial physiological characteristic in seedling of Arecct. The results indicated that drought treatment would lead to root biomass and ratio of root to shoot increase and to leaf biomass decrease with no significant difference with water content of all organs. Drought mainly affected the number, length and roughness of root, consequently affected the surface area and volume of root. The effects would be reflected in the declining of roots ranging from 0 to 5 cm and the total root amount of a single plant, and in the increase of roots longer than 10 cm. The control was the highest among root surface area and volume of the different root segments. As for the surface area of root larger than 6 cm2 and the volume of root more than 0.5 cm3, the root segments gradually declined with the increase of water content. The effect was greater in early stages than later stages in root activity under drought stress. Severer and longer drought would lead to greater root activity lose. h is revealed that Areca mainly adapts to drought environment by means of modulating the amount, length and roughness of root, but the drought obviously restrains the growth of Areca.

关 键 词：槟榔 水分胁迫 根系形态 根系活力 

分 类 号：S667.9[农业科学—果树学]