| 介质pH和氮形态对玉米苗期根系发育的影响 |
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| 引用本文： | 陈冬梅,司江英,封克.介质pH和氮形态对玉米苗期根系发育的影响[J].扬州大学学报(农业与生命科学版),2006,27(2):36-39. |
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| 作者姓名： | 陈冬梅 司江英 封克 |
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| 作者单位： | 扬州大学,环境科学与工程学院,江苏,扬州,225009 |
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| 基金项目： | 国家自然科学基金资助项目(30270783) |
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| 摘 要： | 在介质pH 4.0和6.0条件下研究铵态氮(NH4 -N)和硝态氮(NO3--N)对玉米苗期根系形态及解剖结构的影响。结果表明:介质pH和氮形态均可对玉米苗期根系形态及解剖结构产生影响;以NH4 -N为惟一氮源时,低pH明显抑制玉米侧根的发生,但对根系伸长的抑制并不明显;以NO3--N为单一氮源时,无论是低pH还是近中性条件,对侧根的发生和根系的伸长影响均不明显;以NH4 -N或NO3--N作为氮源,低pH均有利于中柱成熟,在根中央形成大的导管。
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| 关 键 词： | 玉米 铵态氮 硝态氮 pH 根结构 |
| 文章编号： | 1671-4652(2006)02-0036-04 |
| 修稿时间： | 2005年12月10 |
Effects of medium pH and N forms on maize root development at the seedling stage |
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| CHEN Dong-mei,SI Jiang-ying,FENG Ke.Effects of medium pH and N forms on maize root development at the seedling stage[J].Journal of Yangzhou University:Agricultural and Life Science Edition,2006,27(2):36-39. |
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| Authors: | CHEN Dong-mei SI Jiang-ying FENG Ke |
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| Abstract: | Solution culture experiments were carried out to study the effects of different pH levels(pH 4.0,6.0) and N sources(NH~ _4-N,NO~-_3-N) on morphological traits and structures of maize roots at seedling stage.Results showed that both medium pH and N forms had influence on morphological traits and structures of maize roots at seedling stage.With the presence of NH~ _4-N the low pH level obviously inhibited lateral root formation,whereas the inhibition of root elongation was slight at the same conditions.When NO~-_3-N was used as the sole source medium pH had less effects on root elongation and lateral root formation.Whether NH~ _4-N or NO~-_3-N as the sole N source low pH stimulated the development of vascular cylinder and large xylem vessels. |
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| Keywords: | maize NH~ _4-N NO~-_3-N pH root structure |
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