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崔克辉, 何之常, 张甲耀, 夏盛林. 模拟污水中氮、磷对水稻幼苗根系呼吸作用的影响[J]. 植物科学学报, 1996, 14(4): 323-328.
引用本文: 崔克辉, 何之常, 张甲耀, 夏盛林. 模拟污水中氮、磷对水稻幼苗根系呼吸作用的影响[J]. 植物科学学报, 1996, 14(4): 323-328.
Cui Kehui, He Zhichang, Zhang Jiayao, Xia Shenglin. EFFECTS OF NITROGEN AND PHOSPHORUS IN MIMIC WASTEWATER ON ROOT RESPIRATION OF RICE SEEDLINGS[J]. Plant Science Journal, 1996, 14(4): 323-328.
Citation: Cui Kehui, He Zhichang, Zhang Jiayao, Xia Shenglin. EFFECTS OF NITROGEN AND PHOSPHORUS IN MIMIC WASTEWATER ON ROOT RESPIRATION OF RICE SEEDLINGS[J]. Plant Science Journal, 1996, 14(4): 323-328.

模拟污水中氮、磷对水稻幼苗根系呼吸作用的影响

EFFECTS OF NITROGEN AND PHOSPHORUS IN MIMIC WASTEWATER ON ROOT RESPIRATION OF RICE SEEDLINGS

  • 摘要: 研究了模拟污水中不同浓度的N、P对水稻(Oryza sativa L.)幼苗根系呼吸强度、细胞色素氧化酶、呼吸途径等的影响。结果表明, 在总氮(NT)、总磷(PT)浓度分别小于4.28mmol/L、0.2mmol/L时, 呼吸速率、细胞色素氧化酶和呼吸商(RO)均随N、P渡度增大而增加, 当超过这一浓度后, 则随总氮总磷浓度上升而下降。总氮、总磷浓度分别小于4.28mmol/L、0.2mmol/L时, 磷酸戊糖途径(HMP)随N、P浓度增加而显着减弱, 超过这一浓度后则加强;糖酵解-三羧酸循环途径《EMP-TCAC)变化趋势与其相反。总氮、总磷浓度分别超过2.14mmol/L、0.1mmol/L后抗氰呼吸途径呈明显上升趋势, 对氰敏感呼吸途径减弱。EMP-TCAC、对氰敏感呼吸途径活性、根系细胞色素氧化酶分别与呼吸强度的变化趋势极相似, 表明N、P对呼吸强度的影响主要是通过EMP-TCAC途径和对氰敏感的细胞色素途径影响而实现的。

     

    Abstract: The influences on respiratory intensity, cytochrome oxidase activity and respiratory pathway in roots of rice seedings were investigated under various concentrations of nitrogen and phosphorus in mimic wastewater, When the rice seedlings were treated by mimic wastewater containning lower Nand P, the respiration rate, respiratory quotient and cytochrome oxidase activity increased in direct ratio with Nand Pconcentrations, However, they decreased when Nand Pconcentrations increased in mimic wastewater which were higher concentrations of Nand P. The results showed the respiratory pathway had changed in rice roots, When NT<4. 28 mmol/L, PT<0.2 mmol/L, HMPpathway weakened and EMP-TCACstrengthened with Nand Pincreasing, whereas when NT > 4. 28 mmol/Land PT>0.2 mmol/L, HMPpathway enhanced and EMP-TCACdeclined in pace with Nand Pincreasing. In addition, increased cyanide-resistant respiratory pathway and weakened cyanide-sensitive respiratory pathway were observed when NT>2.14 mmol/Land PT>0.1 mmol/L, There was a striking similarity in changing trend among respiratory intensity and EMP-TCACpathway, cyanide-sensitive respiratory pathway, cytochrome oxidase activity in treated roots, the similarity showed that Nand Pin mimic wastewater had affected respiratory intensity mainly by ways of affecting EMP-TCACand cytochrome pathway which was sensitive to cyanide.

     

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