Root Morphology and Root-water-uptake Characteristics of Soybean Seedlings in Response to Different Levels of Phosphorus Supply
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摘要: 采用水培试验方法,研究了供磷水平对苗期大豆根系形态特征及吸水特性的影响。结果显示:同一时期,供磷水平对根干重的影响小于对地上部干重的影响,缺磷胁迫促进了根干重和根冠比增加;供磷水平对大豆根系形态影响显著,大豆根长、根表面积和根体积基本随供磷水平的升高呈现先减小后增大的趋势,0~1 mm直径范围内根长所占比例最高,约在93%以上;磷素浓度介于0~30 μmol·L-1之间时,大豆日平均吸水速率随磷素浓度的增大而增大,当磷素浓度大于30 μmol·L-1时,反而随着磷素浓度的增大而减小。由此可见,大豆根系对不同浓度磷素处理具有一定的自我调节能力,表现为"低促高抑"现象,但这种能力是有限的。Abstract: A nutrient solution experiment was conducted to investigate the effect of different levels of phosphorus supply on root morphology and root-water-uptake characteristics of soybean seedlings. Phosphorus concentration had less effect on root dry weight than on shoot dry weight. Low phosphorus stress increased root dry weight and root/shoot ratio. Phosphorus concentration has significant effect on root morphology of soybean seedlings. Root length,root surface area and root volume initially decreased and then increased with increasing phosphorus concentration. The proportion of root length within 0~1 mm diameter was 93%. Daily average root-water-uptake rates per plant increased with increasing phosphorus concentration within 0~30 μmol·L-1,but decreased when phosphorus concentration was over 30 μmol·L-1. Thus,the soybean roots would change their root morphology in response to various phosphorus concentrations to some extent. In other words,soybean roots would increase under low phosphorus condition but decrease under high phosphorus condition.
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Keywords:
- soybean /
- nitrogen /
- root morphology /
- root-water-uptake
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[1] 李继云,刘秀娣,周伟,等. 有效利用土壤养分元素的作物育种新技术研究[J]. 中国科学(B辑),1995,25(1):41-48. [2] 鲁如坤. 我国的磷矿资源和磷肥生产消费——磷矿资源和磷肥生产[J]. 土壤,2004,36(1):1-4. [3] 鲁如坤,史正元,顾益初. 土壤积累态磷研究Ⅱ——磷肥的表观积累利用率[J]. 土壤,1995,27(6):286-289. [4] 李庆逵. 现代磷肥的研究进展[J]. 土壤学进展,1986(2):1-7. [5] 李宝珍,王松伟,冯慧敏,等. 氮素供应形态对水稻根系形态和磷吸收的影响[J]. 中国水稻科学,2008,22(5):665-668. [6] 陈磊,王盛锋,刘自飞,等.低磷条件下植物根系形态反应及其调控机制[J]. 中国土壤与肥料,2011(6):1-12. [7] 王美丽,严小龙. 大豆根形态和根分泌物特性与磷效率[J]. 华南农业大学学报,2001,22(3):1-4. [8] Marschner P,Solaiman Z,Rengel Z. Brassica genotypes differ in growth,phosphorus uptake and rhizosphere properties under P-limiting conditions[J]. Soil Biology and Biochemistry,2007,39(1):87-98.
[9] 任立飞,张文浩,李衍素,等. 低磷胁迫对黄花苜蓿生理特性的影响[J]. 草业学报,2012,21(3):242-249. [10] Tang C,Hinsinger P J,Drevon J J,et al.Phosphorus deficiency impairs early nodule functioning and enhances proton release in loots of Medicago truncatula L[J]. Annals of Botany,2001,88(1):131-138.
[11] 王树起,韩晓增,严君,等. 缺磷胁迫对大豆根系形态和氮磷吸收积累的影响[J]. 土壤通报,2010,41(3):644-650. [12] 赵利,王明亚,毛培胜,等. 不同氮磷处理对老芒麦种子产量、产量组分及根系的影响[J]. 草地学报,2012,20(4):662-668.
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