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首页> 外文期刊>Australian Journal of Crop Science >Changes in the antioxidant and glyoxalase enzyme activities in leaves of two Moroccan sorghum ecotypes with differential tolerance to nitrogen stress
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Changes in the antioxidant and glyoxalase enzyme activities in leaves of two Moroccan sorghum ecotypes with differential tolerance to nitrogen stress

机译：两种对氮胁迫耐受力不同的摩洛哥高粱生态型叶片抗氧化酶和乙醛氧化酶活性的变化。

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Nitrogen stress as well as other stresses can negatively impact the plant development and metabolism. Generally, stress factorsincrease the reactive oxygen species (ROS) and methylglyoxal (MG) production, which may, in the absence of effective protectivemechanisms, induce irreparable metabolic dysfunction and death. The effect of different amounts (from deficiency to excess) ofnitrate, ammonium or nitrate combined to ammonium, on enzyme activities of antioxidant and methylglyoxal detoxificationsystems of two sorghum ecotypes (3P4 and 4P11) was studied. The N supply was performed per pot during the sowing step usingpotassium nitrate and/or ammonium sulfate. Six N treatments were applied using 120, 240 and 480 Kg ha -1 of ammonium or nitrateand three other treatments were applied using 120 kg ha- 1 nitrate combined to 120, 240 and 480 kg ha -1 of ammonium. The specificactivities of superoxide dismutase (SOD), catalase (CAT), peroxidase (POD), glutathione reductase (GR), glyoxalase I (Gly I) andglyoxalase II (Gly II) were investigated. Results showed that, ammonium excess and N-deficient conditions increased the contents ofmalondialdehyde (MDA), and induced the enzyme activities of ROS and MG detoxification systems, supporting the sorghum’sability to counteract the negative effect of N stress (deficit and excess). We have also shown that the SOD, CAT, GR and Gly Ienzyme activities were higher in the 4P11 ecotype compared to the 3P4 ecotype. These results indicate that sorghum ecotypesexhibit differential tolerance to N stress and suggest that the 4P11 ecotype has higher capacity to cope with N stress.
机译：氮胁迫以及其他胁迫会对植物的发育和代谢产生负面影响。通常，应激因素会增加活性氧（ROS）和甲基乙二醛（MG）的产生，在缺乏有效保护机制的情况下，它们可能会导致不可挽回的代谢功能障碍和死亡。研究了不同数量（从不足到过量）的硝酸盐，铵或硝酸盐与铵的组合对两种高粱生态型（3P4和4P11）的抗氧化剂和甲基乙二醛解毒系统酶活性的影响。在播种步骤中，使用硝酸钾和/或硫酸铵在每个盆中进行氮供应。使用120、240和480 Kg ha -1的铵或硝酸盐进行6次氮处理，使用120 kg ha-1硝酸盐与120、240和480 kg ha -1的铵盐组合进行其他3种处理。研究了超氧化物歧化酶（SOD），过氧化氢酶（CAT），过氧化物酶（POD），谷胱甘肽还原酶（GR），乙二醛酶I（Gly I）和乙二醛酶II（Gly II）的特异性活性。结果表明，铵过量和氮不足条件会增加丙二醛（MDA）的含量，并诱导ROS和MG解毒系统的酶活性，从而支持高粱抵抗N胁迫（亏缺和过量）的负面影响。我们还显示，与3P4生态型相比，4P11生态型的SOD，CAT，GR和Gly酶的活性更高。这些结果表明，高粱生态型表现出对N胁迫的不同耐受性，表明4P11生态型具有较高的应对N胁迫的能力。

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