| 低铁胁迫对玉米苗期根系生长和铁素吸收利用的影响 |
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| 引用本文： | 龙文靖,辜涛,万年鑫,彭白钰,孔凡磊,袁继超.低铁胁迫对玉米苗期根系生长和铁素吸收利用的影响[J].中国生态农业学报,2017,25(8):1163-1172. |
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| 作者姓名： | 龙文靖 辜涛 万年鑫 彭白钰 孔凡磊 袁继超 |
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| 作者单位： | 1. 四川农业大学农学院 温江 611130;四川省农业科学院水稻高粱研究所 泸州 646000;2. 四川农业大学农学院 温江 611130 |
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| 基金项目： | 国家科技攻关计划项目（2012BAD04B13-2）资助 |
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| 摘 要： | 为了揭示不同耐低铁玉米品种苗期根系生长和铁素吸收利用的差异,为玉米耐低铁能力的遗传改良提供依据,以耐低铁玉米品种‘正红2号’和不耐低铁玉米品种‘川单418’为材料,采用重度10μmol(Fe~(3+))·L~(-1)]、中度30μmol(Fe~(3+))·L~(-1)]和轻度50μmol(Fe~(3+))·L~(-1)]3种低铁胁迫及对照100μmol(Fe~(3+))·L~(-1)]的铁营养液处理3叶1心玉米幼苗,分析低铁胁迫对不同耐低铁玉米品种苗期根系生长和铁素吸收利用的影响。结果表明,随着营养液铁浓度降低,两个玉米品种幼苗的根长、根体积、根系活力、干物质、铁含量、铁积累量、相对吸铁能力均显著降低,但根系麦根酸分泌量增多,铁素向地上部转移分配能力增强,铁素的生理效率提高,这是玉米适应低铁胁迫的重要生理机制之一。玉米幼苗的铁素积累量与根长、根体积、根干重、根系活力等根系性状均呈极显著或显著正相关。耐低铁玉米品种在中度和重度低铁胁迫下根长、根体积、根干重、根系活力均较不耐低铁玉米品种高,是其铁素吸收积累量高的重要原因。根系麦根酸分泌量与铁素茎叶分配率呈正相关,铁素茎叶分配率与铁素生理效率呈极显著正相关,增加根系麦根酸的分泌量可在一定程度上提高玉米铁素的茎叶分配率,从而提高铁素生理效率;耐低铁玉米品种在中度和重度低铁胁迫下麦根酸分泌量增幅高于不耐低铁玉米品种,是其铁素生理效率高的主要原因。
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| 关 键 词： | 玉米 低铁胁迫 苗期 根系 麦根酸 铁素吸收利用 |
| 收稿时间： | 2017/1/23 0:00:00 |
| 修稿时间： | 2017/2/24 0:00:00 |
Effect of low iron stress on root growth and iron uptake and utilization of different maize cultivars at seedling stage |
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| LONG Wenjing,GU Tao,WAN Nianxin,PENG Baiyu,KONG Fanlei and YUAN Jichao.Effect of low iron stress on root growth and iron uptake and utilization of different maize cultivars at seedling stage[J].Chinese Journal of Eco-Agriculture,2017,25(8):1163-1172. |
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| Authors: | LONG Wenjing GU Tao WAN Nianxin PENG Baiyu KONG Fanlei and YUAN Jichao |
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| Institution: | College of Agronomy, Sichuan Agricultural University, Wenjiang 611130, China;Institute of Rice and Sorghum Research, Sichuan Academy of Agricultural Sciences, Luzhou 646000, China,College of Agronomy, Sichuan Agricultural University, Wenjiang 611130, China,College of Agronomy, Sichuan Agricultural University, Wenjiang 611130, China,College of Agronomy, Sichuan Agricultural University, Wenjiang 611130, China,College of Agronomy, Sichuan Agricultural University, Wenjiang 611130, China and College of Agronomy, Sichuan Agricultural University, Wenjiang 611130, China |
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| Abstract: | Iron, as a mineral element necessary for plant growth, has a significant effect on chlorophyll synthesis, REDOX reaction, plant photosynthesis, respiration, and substance/energy metabolism. Low content of effective iron in soil can easily cause iron deficiency (chlorosis) in maize planted in calcareous soils of arid/semi-arid regions. The study of the abil-ity/mechanism of maize to resist low iron stress is critical for solving chlorosis due to iron deficiency. In order to determine the mechanism of resistant maize cultivars to low iron stress at seedling stage, 'Zhenghong 2' (resistant to low iron) and 'Chuandan 418' (sensitive to low iron) were selected for the study. For genetic improvement of the maize varieties resistant to low iron stress, three-leaf maize seedlings were treated with different levels of iron solution with severe (10μmol·L-1), me-dium (30μmol·L-1), light (50μmol·L-1) iron stress and control (100μmol·L-1). Analysis of low iron stress for different maize varieties to low iron showed that the low iron stress had significant effects on root growth and iron uptake of maize seedlings after 14 and 28 days of treatments. As iron concentration decreased, root length, root volume, root vitality, dry matter, iron content, iron accumulation and relative absorption capacity of maize seedlings significantly dropped. However, iron treatment increased root-washing mugineic acid, iron distribution in aboveground parts and iron physiological efficiency of the seedlings. This was one of the most important physiological mechanisms of maize adaptation to low iron stress. Although iron accumu-lation had significant positive correlation with iron absorption ability of maize, iron absorption capacity under moderate and severe low iron stress in maize cultivars with different low iron resistances were not significant. Thus the difference in iron absorption ability was not the main cause of high iron accumulation in 'Zhenghong 2'. Iron accumulation was also signifi-cantly positively correlated with root length, root volume, root dry weight and root activity. Compared with 'Chuandan 418' low iron resistant variety 'Zhenghong 2' had longer root length, larger root volume, heavier root dry weight, higher root vital-ity and higher iron accumulation. There was a positive correlation between mugineic acid and iron distribution in stems and leaves of maize seedlings. Also a positive correlation was observed between iron physiology efficiency and iron distribution in stems and leaves of maize seedlings. The enhancement of root secretion of mugineic acid improved iron allocation rate in the shoot system of maize so as to improve the efficiency of iron physiology. The rate of increase in mugineic acid was higher for 'Zhenghong 2' under moderate and severe low iron stress and that was the main reason for the high iron physiological efficiency. |
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| Keywords: | Maize Low iron stress Seedling stage Root Mugineic acid Iron uptake and utilization |
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