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Photosystems and antioxidative system of rye, wheat and triticale under Pb stress

文献类型： 外文期刊

作者： Din, Atta Mohi Ud 1 ; Mao, Hao-Tian 1 ; Khan, Ahsin 1 ; Raza, Muhammad Ali 3 ; Ahmed, Mukhtar 5 ; Yuan, Ming 1 ; Zhang, Zhong-Wei 6 ; Yuan, Shu 6 ; Zhang, Huai-Yu 1 ; Liu, Zheng-Hui 2 ; Su, Yan-Qiu 7 ; Chen, Yang-Er 1 ;

作者机构： 1.Sichuan Agr Univ, Coll Life Sci, Yaan 625014, Peoples R China

2.Nanjing Agr Univ, Key Lab Crop Physiol Ecol & Prod Management, Minist Agr, Nanjing 210095, Peoples R China

3.Islamia Univ Bahawalpur, Natl Res Ctr Intercropping, Bahawalpur 63100, Pakistan

4.Gansu Acad Agr Sci, Lanzhou, Gansu, Peoples R China

5.PMAS Arid Agr Univ, Dept Agron, Rawalpindi 46300, Pakistan

6.Sichuan Agr Univ, Coll Resources, Chengdu 611130, Peoples R China

7.Sichuan Normal Univ, Coll Life Sci, Chengdu 610101, Peoples R China

关键词： Triticeae cereals; Lead; Antioxidative capacity; Photosynthesis; Protein

期刊名称：ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY （ 影响因子：6.8； 五年影响因子：6.9 ）

ISSN： 0147-6513

年卷期： 2023 年 249 卷

页码：

收录情况： SCI

摘要： Lead (Pb2+) pollution in the soil sub-ecosystem has been a continuously growing problem due to economic development and ever-increasing anthropogenic activities across the world. In this study, the photosynthetic performance and antioxidant capacity of Triticeae cereals (rye, wheat and triticale) were compared to assess the activities of antioxidants, the degree of oxidative damage, photochemical efficiency and the levels of photo-synthetic proteins under Pb stress (0.5 mM, 1 mM and 2 mM Pb (NO3)2). Compared with triticale, Pb treatments imposed severe oxidative damage in rye and wheat. In addition, the highest activity of major antioxidant en-zymes (SOD, POD, CAT, and GPX) was also found to be elevated. Triticale accumulated the highest Pb contents in roots. The concentration of mineral ions (Mg, Ca, and K) was also high in its leaves, compared with rye and wheat. Consistently, triticale showed higher photosynthetic activity under Pb stress. Immunoblotting of proteins revealed that rye and wheat have significantly lower levels of D1 (photosystem II subunit A, PsbA) and D2 (photosystem II subunit D, PsbD) proteins, while no obvious decrease was noticed in triticale. The amount of light-harvesting complex II b6 (Lhcb6; CP24) and light-harvesting complex II b5 (Lhcb5; CP26) was significantly increased in rye and wheat. However, the increase in PsbS (photosystem II subunit S) protein only occurred in wheat and triticale exposed to Pb treatment. Taken together, these findings demonstrate that triticale shows higher antioxidant capacity and photosynthetic efficiency than wheat and rye under Pb stress, suggesting that triticale has high tolerance to Pb and could be used as a heavy metal-tolerant plant.

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