摘要
研究了4个不同叶色水稻品系孕穗期不同叶位叶片的光合和叶绿素荧光特性,结果表明:SPAD值最高的深叶色品系净光合速率并不是最高,说明叶绿素总量高其净光合速率并不一定最高;荧光参数在深叶色品系与浅叶色品系间差异也不显著;各品系间倒1叶净光合速率(Pn)、气孔导度(Gs)和蒸腾速率(Evap)均明显低于倒2叶;而胞间CO2浓度(Ci)基本维持不变,说明叶片Pn的变化主要不是气孔因素引起的。不同叶位叶绿素含量降低与Pn下降的表现一致,叶绿素荧光分析表明Fo、Fm、Fv/Fm和PI随叶位发生变化,而每个品系倒1叶的Fm均大于倒2叶,这表明孕穗期倒1叶PSⅡ电子传递的潜力强于倒2叶。不同叶色品系中,除沈农07015外,反映光合荧光参数中光合有活反应中心吸收(ABS/RC)、耗散(DIo/RC)的能量和用来还原QA的激发能(TRo/RC)均为倒1叶大于倒2叶,表明倒1叶有活性的反应中心剩余的耗能效率高于倒2叶。
Four rice genotypes w ith different leaf colors were examined at booting stage for investigating the photosynthesis and chlorophyll fluorescence properties of different position leaves. The dark-green leaf rice genotype had the highest SPA D value, but not highest net photosynthetic rate （Pn）, which suggested that the genotype with the highest chlorophyll content didn＇t mean the highest Pn. There were no significant differences in fluorescence parameters between dark-green leaf color and light leaf color genotypes.The Pn, stomatal conductance （Gs） , transpiration rate （Evap） of the first leaf were significantly lower than that of the second leaf, while the intercellular CO2 concentration （Ci） had little change, which indicated that the decrease of Pn did not result from the decrease of Gs. The decrease of SPAD value that has a close correlation with chlorophyll content was one of the apparent reasons resulted in decease of Pn. Further evidence from chlorophyll fluorescence showed that the Fo, Fm, Fv/Fm and PI changed with the leaf position but the Fm of the first leaf in the four genotypes was bigger than that of the second leaf, which showed that PSIIelectron transport potential of the first leaf was stronger than that of the second leaf. The absorption per active reactions centers （ABS/RC）, dissipation per active reaction centers （DIo/RC） and happing per active reaction centers （TRo/RC） in the first leaf were higher than those in the second leaf in three rice genotypes except Shennong07015, which showed that the remainder energy dissipation efficiency in per active reaction centers in the first leaf was higher than that of the second leaf.
出处
《沈阳农业大学学报》
CAS
CSCD
北大核心
2014年第1期1-5,共5页
Journal of Shenyang Agricultural University
基金
辽宁省科技攻关重大项目(2012201002)
辽宁省博士启动基金项目(20121142)
关键词
水稻
叶位
叶绿素荧光
光合作用
rice
leaf position
chlorophyll fluorescence
photosynthesis
