氯对水稻幼苗根系生长和形态特征的影响  

Effects of Chlorine on Root Growth and Morphological Characteristics of Rice Seedlings

作　　者：熊健 周明园 汪晓丽[1] 王小兵[1] 封克[1] Xiong Jian;Zhou Mingyuan;Wang Xiaoli;Wang Xiaobing;Feng Ke(College of Environment Science and Engineering,Yangzhou University,Yangzhou,225009)

机构地区：[1]扬州大学环境科学与工程学院

出　　处：《分子植物育种》2019年第22期7476-7481,共6页Molecular Plant Breeding

基　　金：土壤与农业可持续发展国家重点实验室开放课题(Y20160017);江苏省农业科技自主创新资金项目(CX(17)3043);扬州大学科技创新培育基金项目(2016CXJ047);扬州市重点研发计划-社会发展(SQZ201630018)共同资助

摘　　要：本研究以‘扬稻6号’和‘淮稻10号’两个水稻品种作为供试材料,考察生理浓度条件下Cl^-对水稻幼苗根系生长和形态发育的影响。结果表明,与难以进行跨细胞膜转运的Glu^-相比,1 mmol/L Cl^-增加了两种供试水稻幼苗的根鲜重,但对根冠比并无显著影响。1 mmol/L Cl^-促进了水稻幼苗根系的伸长生长,供给Cl-显著增加了‘淮稻10号’的总根长,促进了‘淮稻10号’根系中直径小于0.3mm的根的生长;Cl^-促进了‘扬稻6号’根系中直径大于0.6 mm的根的生长。在1 mmol/L Cl^-的试验条件下,‘扬稻6号’幼苗根系的平均直径无显著变化,但‘淮稻10号’幼苗根系的平均直径明显降低。1 mmol/L Cl^-有促进水稻幼苗根体积和根表面积的趋势,但差异未达显著水平。Cl^-供给增加了‘扬稻6号’幼苗直径大于0.6 mm的根的总表面积,但降低了‘淮稻10号’幼苗直径大于0.6 mm的根的总表面积。生理浓度的Cl^-对水稻幼苗根系的生长和形态特征有着一定的影响,且在不同的水稻品种之间存在着差异。本研究结果可为进一步探讨氯对植物生长发育的调节机制提供依据,也可为氯的植物营养生理研究提供参考。Seedlings of two rice cultivars(Oryza sativa L.subsp.japonica)were used as experimental materials to explore the effects of chloride supply at a physiologically relevant level on root growth and morphological characteristics.Results showed that compared with gluconate,which is an anion unable to permeate the cell membrane,Cl^- increased the fresh weight of roots,while had no significant effects on the root-shoot ratios.1 mmol/L Cl^-stimulated the root elongation.Total root length of ‘Huaidao10’significantly increased,especially the roots with diameter less than 0.3 mm.For ‘Yangdao6’,total length of the rootswith diameter more than 0.6 mm increased.At the experimental level of 1 mmol/L Cl^-,the average root diameter of ‘Yangdao 6’seedlings had no significant change,while that of ‘Huaidao10’seedlings decreased evidently.Cl-had the tendency of increasing root total surface area and volume but differences did not reach the significant level.Cl^- supply increased root surface area of ‘Yangdao6’with diameter more than 0.6 mm,while deceased that of ‘Huaidao10’.Chloride supply at physiologically levels influenced growth and morphology of rice roots,and differences existed among rice cultivars.Investigating the effects of Cl on plant growth and morphological development remains a key issue for further studies on Cl nutrition mechanisms.

关 键 词：氯 根系 形态 水稻 

分 类 号：S51[农业科学—作物学]