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.
出处
《水土保持学报》
CSCD
北大核心
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)
