硼和半胱氨酸对水稻中氰化物吸收同化调控的综合效应研究
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国家自然科学基金项目(42277361)资助


Synergistic Effect of Boron and Cysteine on the Regulation of Cyanide Absorption and Assimilation in Rice
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    摘要:

    氮(N)是植物生长发育的必须元素,硼(B)缺失会影响体内N代谢,继而迫使植物从其他的途径获取N源。无毒剂量的氰化物(CN-)可通过β-氰丙氨酸合成酶(β-CAS)的降解途径为植物提供辅助N源;半胱氨酸(Cys)被认为是β-CAS途径中的限制因素。该研究以水稻(Oryza sativa)幼苗为对象,设定CN--B-Cys、CN-+B-Cys、CN--B+Cys和CN-+B+Cys等4种处理,评估B和Cys对水稻幼苗CN-吸收同化作用的综合调控效应。结果表明,CN--B+Cys处理的水稻幼苗对CN-的吸收率最高(P<0.05),其次是CN-+B+Cys;CN--B+Cys和CN-+B+Cys处理的水稻幼苗体内CN-残留浓度显著低于其他处理(P<0.05); CN--B+Cys处理的水稻幼苗具有最高的CN-同化率(P<0.05),其次是CN-+B+Cys、CN--B-Cys和CN-+B-Cys。同时, CN--B+ Cys处理的水稻幼苗对NH4+的吸收率与同化率最高(P<0.05),其次是CN-+B+Cys。因此,添加Cys和缺B处理可促进水稻幼苗对CN-和NH4+的吸收和同化率,同时降低CN-对水稻幼苗的毒性损伤。

    Abstract:

    Nitrogen (N) is an essential element for plant growth and development, and lack of boron (B) will affect N metabolism in the body, forcing plants to obtain N sources from other ways. Non-toxic dose of cyanide (CN-) can provide auxiliary N source for plants through β-cyanoalanine synthetase (β-CAS) degradation pathway. Cysteine (Cys) is considered to be a limiting factor in the β-CAS pathway. In this study, rice (Oryza sativa) seedlings were treated with CN--B-Cys, CN-+B-Cys, CN--B+Cys and CN-+B+Cys to evaluate the combined regulatory effects of B and Cys on the absorption and assimilation of CN- in rice seedlings. The results showed that CN- absorption rate of rice seedlings treated with CN--B+Cys was the highest (P<0.05), followed by CN-+B+Cys. The residual concentration of CN- in rice seedlings treated with CN--B+Cys and CN-+B+Cys was significantly lower than that of other treatments (P<0.05). CN--B+Cys processing of rice seedlings have the highest CN- assimilation rate (P<0.05), followed by CN-+B+Cys, CN--B-Cys and CN-+B-Cys. Meanwhile, the NH4+ absorption rate and assimilation rate of rice seedlings treated with CN--B+Cys were the highest (P<0.05), followed by CN-+B+Cys. Therefore, the addition of Cys and B deficiency treatment could promote the absorption and assimilation rate of CN- and NH4+ in rice seedlings, and reduce the toxic damage of CN- to rice seedlings.

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康艺,李诚至,田鹏,彭晓英,于晓章.硼和半胱氨酸对水稻中氰化物吸收同化调控的综合效应研究[J].热带亚热带植物学报,2025,33(3):282~288

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  • 收稿日期:2023-12-10
  • 最后修改日期:2024-03-06
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  • 在线发布日期: 2025-05-23
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