叶片淋洗对玉米耐盐性影响机理的研究  

Studies of Mechanism of Maize Salt-Resistance Affected by Foliar Leaching

作　　者：夏阳[1] 林杉[2] 张福锁[2] 李杰[2] 胡恒觉[1] 

机构地区：[1]甘肃农业大学园艺系,甘肃兰州730070 [2]中国农业大学植物营养系,北京100094

出　　处：《作物学报》2001年第3期397-403,共7页Acta Agronomica Sinica

基　　金：国家自然科学基金!"淋洗对植物叶片质外体中养分平衡和植物生长的影响"项目 (批准号 :396 70 34);山东农业大学博士后资金资助

摘　　要：叶片淋洗和 Na Cl胁迫对液培条件下不同抗盐性玉米品种生长和体内矿质营养含量的影响。研究结果表明 :随 Na Cl浓度提高 ,玉米生物量下降 ;叶片淋洗可提高低盐 ( 10 0 mmol/ L Na Cl)浓度下盐敏感玉米品种的生物量。随 Na Cl浓度的提高 ,两品种玉米的电导率均明显升高 ;高盐 ( 2 0 0 mmol/ LNa Cl)浓度下 ,耐盐品种的电导率低于盐敏感品种 ,同时淋洗处理的电导率明显低于对照 (不淋洗 ) ;随Na Cl浓度的提高 ,叶绿素含量下降 ,酸性 ( p H3.5)淋洗液降低耐盐品种高盐胁迫下的叶绿素含量 ,对其它淋洗处理的叶绿素含量没有明显影响。随 Na Cl胁迫的增加 :( 1)茎叶 K+、Zn+2 、Ca+2 和 Na+含量增加 ,根系 K+含量下降 ,耐盐品种的 K+含量高于盐敏感品种 ,根系的 Na+含量则没有明显变化 ;( 2 )根系 Ca+2 和 Zn+2 含量盐敏感品种增加 ,耐盐品种没有变化 ;( 3)对两品种茎叶和根系 Mg+2 含量及茎叶 Fe+2含量没有产生影响 ,根系 Fe+2含量明显高于茎叶 ;同一盐浓度下 ,抗盐品种茎叶的 Fe+2含量高于盐敏感品种。淋洗使茎叶 K+、Na+、Ca+2和 Zn+2含量下降 ,对 Mg+2含量没有影响 ;酸性淋洗液降低盐敏感品种的茎叶 Fe+2 含量 ,对抗盐品种的 Fe+2 含量没有影响 ;The impact of foliar leaching on growth and mineral nutrition contents of different salt resistant maize varieties under NaCl stress was investigated. The results showed that with the increasing of NaCl concentration from 100 to 200 mmol/L, shoot and root biomass decreased; foliar leaching could increase the biomass of saltsensitive maize under low NaCl stress (100 mmol/L). With the increasing of NaCl stress, the conductance ratio of maize increased significantly. The conductance ratio of salt resistant maize was lower than that of salt sensitive maize under high NaCl stress (200 mmol/L) and that of foliar leaching treatments was lower than that of no leaching treatment. With the increasing of NaCl stress, the contents of chlorophyll decreased and acidic leaching solution (pH3.5) decreased the chlorophyll contents of salt sensitive variety. With the increasing of NaCl stress, (1) the K +, Zn +, Ca +2 and Na + contents of shoot increased and the K + contents of root decreased. The K + contents of salt resistant variety were higher than that of salt sensitive one. The Na + contents of root remained unchanged; (2) the root Ca +2 and Zn + contents of salt sensitive variety increased and those of salt resistance remained unchanged; (3) the Mg +2 contents of shoot and root and the Fe +2 contents of shoot remained unchanged. The Fe +2 contents of root were higher than that of shoot and under same NaCl stress the shoot Fe +2 contents of saltresistance were higher than that of salt sensitive one. Foliar leaching decreased the shoot K +、 Na +、 Ca +2 ane Zn +2 contents and the shoot Mg +2 contents remained unchanged. Acidic leaching solution decreased the shoot Fe +2 contents of salt sensitive variety and the root Fe +2 contents of salt sensitive variety remained unchanged. Foliar leaching had no significant effect on mineral nutrition of root.

关 键 词：叶片淋洗 盐胁迫 生长 矿质营养 玉米 基因型差异 营养平衡 叶片质外体 

分 类 号：Q945[生物学—植物学]