3种观叶植物水生性根系形成及NAA处理效应  

Development of Aquatic-like Roots of Three Foliage Plants in Hydroculture and Effects of α-Naphthaleneacetic acid(NAA)on Rooting

作　　者：王代容[1] 刘晓荣[1] 陈敏[1] 李妙汉[1] 廖飞雄[1] 

机构地区：[1]广东省农业科学院花卉研究所广东省园林花卉种质创新综合利用重点实验室,广东广州510640

出　　处：《热带作物学报》2011年第4期702-707,共6页Chinese Journal of Tropical Crops

基　　金：广东省科技攻关项目(2008B020400011)

摘　　要：研究发财树、螺纹铁和龙舌兰3种观叶植物水培中水生性根系发生与生长特性、NAA的诱导效应。结果表明,3种植物分别在水培后的第9.7、14.4和3.5 d开始出根,40 d左右发根数达到最高峰,其中发财树在水培后的前20 d就产生大部分根系。龙舌兰的根在20 d左右就达最长,其它2种植物根的生长随时间延长而增长。发财树、龙舌兰培养到20 d,螺纹铁培养到40 d,水生性根的基部粗度达到最大,但之后3种植物水生性根系基部径粗均会出现不同程度的缩小。不同浓度NAA(100、200和300 mg/L)处理可提高3种植物根系产生的数量,以200 mg/L NAA处理产生的根数最多;NAA处理会延迟发财树、龙舌兰的出根时间;降低根生长速率,处理后的根长较对照短,根系更加粗壮。The development of the aquatic-like roots of three foliage plants Pachira macrocarpa, Dracaena deremensis ＇Compacta＇ and Agave americana and the effects of different concentrations of α-Naphthaleneacetic acid （NAA） on rooting were investigated as potted in hydroculture. The results showed that three foliage plants initiated the roots at 9.7, 14.4 and 3.5 d respectively hydroculture on and reached the peak of rooting at 404 day, while P. macrocarpe produced the most of roots to the first 20 d of the hydrocuhure. The root of A. americana stopped increasing in length at about 20 d of the hydrocuhure, but the roots of other two plants kept growing as hydroculture continued. The maximum root diameters were measured at 20 d for P. macrocorpa and A. americana and at 40d for D. deremensis ＇Compacta＇. However, The Root of three plants were found to shrink in diameter after 20 d or 40 d. NAA treatment with the concentrations of 100, 200 and 300 mg/L increased root number significantly and the optimal concentration was 200 mg/L for three plants. NAA treatments delayed the root formation of P. macrocarpa and A. americana and decreased root growth velocity. Compared to the control the aquatic-like roots of three plants with NAA treatments were shorter in length and bigger in diameter.

关 键 词：观叶植物 水培 根系 生长素 

分 类 号：S682.36[农业科学—观赏园艺]