缺磷对不同磷效率基因型大豆光合日变化的影响

被引:27
作者
于海秋 [1 ]
彭新湘 [2 ]
严小龙 [3 ]
曹敏建 [1 ]
机构
[1] 沈阳农业大学农学院
[2] 华南农业大学植物逆境生物学研究中心
[3] 华南农业大学根系生物学研究中心
关键词
缺磷; 大豆; 光合作用; 呼吸作用; 日变化;
D O I
暂无
中图分类号
S565.1 [大豆];
学科分类号
摘要
用1/2Hoagland营养液培养磷高效大豆基因型BX10和磷低效基因型BD2,缺磷胁迫15d后测定其光合、光呼吸、暗呼吸的日变化,并进一步探讨了影响上述过程的原因。结果表明:缺磷使两基因型光合速率(Pn)显著下降,但BX10仍高于BD2(尤其在上午);缺磷对PSⅡ光化学效率(Fv/Fm)和胞间CO2浓度(Ci)的影响无规律可循,与Pn的相关性也不显著;缺磷显著降低大豆气孔导度(Gs),并与Pn呈极显著正相关(r=0.753,P<0.001)。暗呼吸(Rd)与Pn日变化趋势相近(r=0.706,P<0.01),但缺磷对其影响不大;缺磷下光呼吸(Pr)显著下降,而Pr/(Pn+Pr)在BX10中却相对提高。光呼吸相对加强可能有助于磷高效基因型回补叶绿体光合作用所需的无机磷(Pi)。
引用
收藏
页码:519 / 522
页数:4
相关论文
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