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采用水培实验,在水稻苗期研究外源添加不同浓度生长素(3-吲哚乙酸,IAA)对水稻根系(根长、根重)、地上部(株高、地上部重量)生长和叶绿素含量的影响。结果表明,不同浓度IAA处理水稻1d-5d,对水稻苗期的生长无明显影响。处理时间延长至10d,1μM IAA处理水稻根长显著增加(p<0.05),增加了41.1%,对株高、根重和地上部重量无明显影响。随IAA浓度的升高,对其影响表现出一定的差异。与对照相比,10μM、25μM和100μM IAA处理根重显著增加(p<0.05),分别增加了39.1%、25.9%和17.8%;25μM-100μM IAA处理使株高和地上部重量显著降低,降幅分别在16.0%-20.7%和20.0%-36.7%之间,导致其根冠比随IAA浓度增加而增大。与对照相比,外源施加IAA(1μM-75μM)处理使水稻叶绿素a、b和总含量均显著增加(p<0.05),增幅均在30%以上,以10μM对叶绿素含量的影响最大。因此,外源施加适宜浓度的IAA可以促进水稻的生长和叶绿素含量的提高,促进植物光合效率,提高水稻产量。
A hydroponic experiment was conducted to study the effects of exogenous auxin (IAA) on root growth (root length and root weight), shoot (plant height, shoot weight) and chlorophyll content in rice seedling stage. Effect of content. The results showed that different concentrations of IAA treatment of rice 1d-5d, rice seedling growth had no significant effect. The root length of rice treated with 1 μM IAA increased significantly (p <0.05) and increased by 41.1% with no significant effect on plant height, root weight and aboveground weight of rice. With the IAA concentration increased, its influence showed some differences. Compared with the control, the root weights increased significantly (p <0.05) by 39.1%, 25.9% and 17.8% at 10μM, 25μM and 100μM IAA treatments respectively. The plant height and shoot weight were significantly decreased with 25μM-100μM IAA treatment, Respectively, between 16.0% -20.7% and 20.0% -36.7%, resulting in an increase in root / shoot ratio with increasing IAA concentration. Compared with the control, IAA (1μM-75μM) significantly increased the content of chlorophyll a, b and total content of rice (p <0.05), with the increase of more than 30%, and the effect of 10μM on chlorophyll content was the most. Therefore, exogenous application of appropriate IAA concentrations can promote rice growth and chlorophyll content, promote plant photosynthetic efficiency and increase rice yield.