LI Peng,ZHANG Yong-qing.Effect of Low Phosphorous Stress on PhotosynthesisProperties of Different Broomcorn Millet Varieties[J].HEILONGJIANG AGRICULTURAL SCIENCES,2012,(07):35-39.
低磷胁迫对不同黍稷品种光合特性的影响
- Title:
- Effect of Low Phosphorous Stress on PhotosynthesisProperties of Different Broomcorn Millet Varieties
- 文章编号:
- 1002-2767(2012)07-0035-05
- 分类号:
- S516
- 文献标志码:
- A
- 摘要:
- 利用不同作物或品种吸收利用土壤磷能力的差异提高磷素营养效率,是解决磷资源短缺的重要生物学途径。选择黄土高原旱、薄地区比较稳产的抗逆度荒杂粮作物黍稷作为研究对象,采用盆栽法在低磷胁迫下对 2个黍稷品种(榆黍1号和一点红)的叶绿素含量、光合特性和叶绿素荧光参数进行了研究。结果表明:在低磷胁迫下,各黍稷品种的叶绿素含量、光合速率(Pn)、蒸腾速率(Tr)和气孔导度(Gs)下降,且品种间差异显著,而胞间CO2浓度在低磷时没有发现明显的变化;初始荧光(Fo)在低磷时升高,可变荧光(Fv)、最大荧光(Fm)、最大光化学效率(Fv/Fm)、光化学淬灭系数(qP)表现为显著下降,非光化学猝灭系数(NPQ)在低磷时表现出上升趋势。但榆黍1号的变化幅度小于一点红,表明榆黍1号植株生长发育和光合特性比一点红受低磷胁迫的影响小,较强的光合能力和较高的电子传递速率是榆黍1号适应低磷环境的重要生理特性。
- Abstract:
- Using crop varieties with high phosphorus use efficiency is one of important biological ways to alleviate shortage of resources.Taking the more stable grain crops in the arid and semi-arid area for broomcorn millet as study object,using the soil culture method,the chlorophyll content,the photosynthetic characteristics and chlorophyll fluorescence parameters of two broomcorn millet(Panicum miliaceum L.)varieties(Yushu No.1 and Yidianhong)under the P-deficiency condition were researched.The results showed that net photosynthetic rate(Pn),transpiration rate(Tr)and stomatal conductance(Gs)were decreased under low P stress,and the difference between varieties were significant,while intercellular CO2concentration(Ci)was no difference.Initial fluorescence(Fo)and the cancellation of the photochemical destroy coefficient(NPQ)were increased,but(Fv),(Fm),(Fv/Fm)and(qP)were decreased under low P stress.The P stress damaging effects on plant growth and photosynthesis were minimal on the Yushu No.1 compared to Yidianhong.Under low P stress the Yushu No.1 maintained higher photosynthetic efficiency,stronger light energy transfer capacity that may be the major physiological traits in the adaptive capacity to low P conditions.
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备注/Memo
基金项目:国家自然基金面上资助项目(30871483)