CO_2浓度升高对2个品种水稻Cu吸收、根形态和植物络合素合成的影响  

Effects of Elevated CO_2 on Cu Uptake,Root Morphology and Phytochelatins Synthesis in Different Rice Varieties

作　　者：李中阳[1,2,3] 樊向阳[1,2,3] 宋正国[4] 居学海[4] 杜臻杰[1,2,3] 

机构地区：[1]中国农业科学院农田灌溉研究所,河南新乡453003 [2]中国农业科学院河南新乡农业水土环境野外科学观测试验站,河南新乡453003 [3]中国农业科学院农业水资源高效安全利用重点开放实验室,河南新乡453003 [4]农业部环境保护科研监测所生态毒理与环境修复研究中心,天津300191

出　　处：《水土保持学报》2013年第4期207-211,216,共6页Journal of Soil and Water Conservation

基　　金：国家自然科学基金项目(51209208;41071217;51209209);中央级公益性科研院所基本科研业务费专项(0032012034);国家高技术研究发展"863"计划项目(2012AA101404)

摘　　要：为探讨CO2浓度升高条件下不同水稻品种粤杂889(YZ)和荣优398(RY)对耐Cu胁迫性的变化特征,利用水培试验研究不同Cu浓度下CO2浓度升高对2种水稻幼苗生物量、Cu含量、根形态及植物络合素(GSH和PCs)的影响。结果表明,低铜处理对水稻生长具有促进作用,增加2种水稻生物量及根系根毛数、总根长、表面积和体积。随着Cu处理浓度升高,根系GSH和PCs含量分别呈现渐减和渐增趋势。CO2浓度升高条件下,2种水稻生物量显著增加,600μmol/L Cu处理时增加比例最大,YZ和RY分别增加59.8%和49.0%;水稻根、茎叶Cu含量降低,但根系形态各个指标明显增加,且在高Cu处理下其增加比例较大。CO2浓度升高显著增加根系PCs合成,50μmol/L Cu处理时增加比例最大,YZ和RY分别增加121.6%,78.7%。在CO2浓度正常与升高条件下,根系GSH、PCs含量与Cu浓度都具有显著相关性。CO2浓度升高通过增加根系形态和PCs含量以增强水稻对Cu的抗逆性,但存在着品种差异,YZ的增加比例大于RY。A hydroponic experiment was conducted to study the effects of elevated CO2 on the rice seedlings biomass, Cu concentration, root morphology and phytochelatins synthesis in rice Yueza-889（YZ） and Rongyou- 398（RY）. The results showed that low Cu treatments enhanced the rice growth and increased the root tip numbers, length, surface area and volume. Root GSH and PCs concentrations were decreased and increased, respectively with increasing Cu content. Elevated CO2 increased the rice biomass. The dry weights were increased by 58.9~ for YZ and increased by 49.0~ for RY, respectively with 600 /~mol/L Cu treatments. Cu concentrations of shoot and root in two rice varieties were decreased under the elevated CO2, while the each index of root were increased, especially under high Cu treatments. With 50 /~mol/L Cu treatments, elevated CO2 increased the rice root phytochelatins synthesis by 121.6 ~ for YZ and 78.7 % for RY, respectively. GSH, PCs concentrations of root both had significant positive correlation with Cu concentrations under normal and elevated CO2 treatments. Elevated CO2 could improve the rice stress tolerance to Cu by increasing the concentrations of morphology and PCs of root, but there were obvious variations of stress resistance between the two rice varieties.

关 键 词：铜 CO2浓度升高 根形态 植物络合素 水稻品种 

分 类 号：S154.4[农业科学—土壤学]