《植物生理学报》 2013, 49(6): 573-578

吲哚乙酸、吲哚丁酸和萘乙酸对大豆幼根生长的影响

李欣欣, 赵静, 廖红^*

亚热带农业生物资源保护与利用国家重点实验室, 华南农业大学根系生物学研究中心, 广州510642

通信作者：廖；E-mail: hliao@scau.edu.cn；Tel: 020-85283380

摘　要：

以大豆基因型‘HN89’为材料, 设置不同浓度的吲哚乙酸(IAA)、吲哚丁酸(IBA)及萘乙酸(NAA)处理, 研究不同外源生长素对大豆根系生长的影响。结果表明: 低浓度的IAA (0.05和0.5 μmol·L-1)能够促进大豆主根伸长生长及侧根发育;IBA、NAA和高浓度IAA抑制了主/侧根的伸长生长, 使根系发育不良, 生物量下降。这说明不同外源生长素类物质不同程度的调控了大豆根系形态构型。

关键词：大豆; 吲哚乙酸; 吲哚丁酸; 萘乙酸; 根系; 生长发育

收稿：2013-02-20   修定：2013-04-24

资助：国家自然科学基金项目(31000931)。

Effects of Indoleacetic Acid, Indolebutyric Acid and Naphthylacetic Acid on Soybean [Glycine max (L.) Merr] Root Growth

LI Xin-Xin, ZHAO Jing, LIAO Hong*

State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, Root Biology Center, South China Agri-cultural University, Guangzhou 510642, China

Corresponding author: LIAO Hong; E-mail: hliao@scau.edu.cn; Tel: 020-85283380

Abstract:

The effects of exogenous auxins on root growth were evaluated using soybean genotype ‘HN89’ as plan materials. The seedlings were treated by different concentrations of indoleacetic acid (IAA), indolebutyric acid (IBA) and naphthylacetic acid (NAA). The results showed that only low concentrations (0.05 and 0.5 µmol·L-1) of IAA could promote both primary root elongation and lateral root development in soybean, IBA, NAA and high concentration of IAA inhibited the elongation of both primary and lateral roots, resulted in ab-normal root development, and subsequently reduced soybean biomass. These results elucidated that different exogenous auxin regulated the soybean root architecture inordinately.

Key words: soybean (Glycine max); indoleacetic acid; indolebutyric acid; naphthylacetic acid; roots; growth and development