Antioxidative enzymes in seedlings of Nelumbo nucifera germinated under water

Physiologia Plantarum
Takashi UshimaruHideo Tsuji

Abstract

Dry seeds of anoxia-tolerant lotus (Nelumbo nucifera Gaertn=Nelumbium speciosum Willd.) have green shoots with plastids containing chlorophyll, so photosynthesis starts even in seedlings germinated under water, namely hypoxia. Here we investigated antioxidative enzyme changes in N. nucifera seedlings responding to oxygen deficiency. The activity of superoxide dismutase (SOD; EC 1.15.1.1), dehydroascorbate reductase (DHAR; EC 1.8.5.1) and glutathione reductase (GR; EC 1.6.4.2) were lower in seedlings germinated under water (submerged condition) in darkness (SD seedlings) than those found in seedlings germinated in air and darkness (AD seedlings). In contrast, ascorbate peroxidase (APX; EC 1.11.1.11) activity was higher in SD seedlings and the activity of catalase (EC 1.11.1.6) and monodehydroascorbate reductase (MDAR; EC 1.6.5.4) in SD seedlings was nearly the same as in AD seedlings. When SD seedlings were exposed to air, the activity of SOD, DHAR and GR increased, while the activity of catalase and MDAR decreased. Seven electrophoretically distinct SOD isozymes were detectable in N. nucifera. The levels of plastidic Cu,Zn-SODs and Fe-SOD in SD seedlings were comparable with those found in AD seedlings, which may reflect the ma...Continue Reading

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Citations

Nov 20, 2008·Applied Biochemistry and Biotechnology·Chen DongZhongli Hu
Feb 14, 2002·Plant, Cell & Environment·S. D. TyermanH. Bramley
Apr 30, 2015·Environmental Science and Pollution Research International·Sarvajeet Singh GillNarendra Tuteja
Jan 28, 2021·International Journal of Molecular Sciences·Weitao JiaShengjun Wu
May 17, 2003·Journal of Plant Physiology·Takashi UshimaruHideo Tsuji

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