Silicon (Si) alleviates cotton (Gossypium hirsutum L.) from zinc (Zn) toxicity stress by limiting Zn uptake and oxidative damage
Silicon (Si) alleviates cotton (Gossypium hirsutum L.) from zinc (Zn) toxicity stress by limiting Zn uptake and oxidative damage
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DOI：
10.1007/s11356-014-3938-9
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发表时间：
2015-03-01
影响因子：
5.8
通讯作者：
Sharif, Muhammad
中科院分区：
文献类型：
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作者：
Anwaar, Shad Ali;Ali, Shafaqat;Sharif, Muhammad
硅（Si）是一种重要的肥料元素，可有效提高植物对多种生物和非生物胁迫的耐受性。研究了硅对棉花锌（Zn）毒性胁迫的缓解作用。以水培方式栽培棉花植株，分别处理不同浓度Zn（0、25、50 μ M）单独和/或与1 mM Si联合处理。随着生长培养基中锌浓度的增加，过氧化氢（H2O2）、电解质泄漏和丙二醛（MDA）水平的升高会引起细胞氧化损伤，从而抑制棉花的生长、生物量、叶绿素色素和光合过程。施硅显著抑制了锌在根、茎、叶等植物各部位的积累，从而提高了锌胁迫和未胁迫植物的生物量、光合作用、生长参数和抗氧化酶活性。此外，Si降低了MDA和H2O2的生成以及电解质的泄漏，表明其在保护棉花免受锌中毒引起的氧化损伤中起作用。综上所述，外源施硅可以通过限制锌的生物利用度和氧化损伤来改善锌中毒胁迫下棉花的生长发育。
Silicon (Si) is as an important fertilizer element, which has been found effective in enhancing plant tolerance to variety of biotic and a-biotic stresses. This study investigates the Si potential to alleviate zinc (Zn) toxicity stress in cotton (Gossypium hirsutum L.). Cotton plants were grown in hydroponics and exposed to different Zn concentration, 0, 25, and 50 mu M, alone and/or in combination with 1 mM Si. Incremental Zn concentration in growth media instigated the cellular oxidative damage that was evident from elevated levels of hydrogen peroxide (H2O2), electrolyte leakage, and malondialdehyde (MDA) and consequently inhibited cotton growth, biomass, chlorophyll pigments, and photosynthetic process. Application of Si significantly suppressed Zn accumulation in various plant parts, i.e., roots, stems, and leaves and thus promoted biomass, photosynthetic, growth parameters, and antioxidant enzymes activity of Zn-stressed as well unstressed plants. In addition, Si reduced the MDA and H2O2 production and electrolyte leakage suggesting its role in protecting cotton plants from Zn toxicity-induced oxidative damage. Thus, the study indicated that exogenous Si application could improve growth and development of cotton crop experiencing Zn toxicity stress by limiting Zn bioavailability and oxidative damage.