Siddiqui Manzer H, Al-Whaibi Mohamed H, Sakran Ahmed M, Basalah Mohammed O, Ali Hayssam M
Department of Botany and Microbiology, College of Science, King Saud University, Riyadh, Saudi Arabia.
Int J Mol Sci. 2012;13(6):6604-6619. doi: 10.3390/ijms13066604. Epub 2012 May 29.
Cadmium (Cd) in soil poses a major threat to plant growth and productivity. In the present experiment, we studied the effect of calcium (Ca(2+)) and/or potassium (K(+)) on the antioxidant system, accumulation of proline (Pro), malondialdehyde (MDA), and content of photosynthetic pigments, cadmium (Cd) and nutrients, i.e., Ca(2+) and K(+) in leaf of Vicia faba L. (cv. TARA) under Cd stress. Plants grown in the presence of Cd exhibited reduced growth traits [root length (RL) plant(-1), shoot length (SL) plant(-1), root fresh weight (RFW) plant(-1), shoot fresh weight (SFW) plant(-1), root dry weight (RDW) plant(-1) and shoot dry weight (SDW) plant(-1)] and concentration of Ca(2+), K(+), Chlorophyll (Chl) a and Chl b content, except content of MDA, Cd and (Pro). The antioxidant enzymes [peroxidase (POD) and superoxide dismutase (SOD)] slightly increased as compared to control under Cd stress. However, a significant improvement was observed in all growth traits and content of Ca(2+), K(+), Chl a, Chl b, Pro and activity of antioxidant enzymes catalase (CAT), POD and SOD in plants subjected to Ca(2+) and/or K(+). The maximum alleviating effect was recorded in the plants grown in medium containing Ca(2+) and K(+) together. This study indicates that the application of Ca(2+) and/or K(+) had a significant and synergistic effect on plant growth. Also, application of Ca(2+) and/or K(+) was highly effective against the toxicity of Cd by improving activity of antioxidant enzymes and solute that led to the enhanced plant growth of faba bean plants.
土壤中的镉（Cd）对植物生长和生产力构成重大威胁。在本实验中，我们研究了钙（Ca(2+)）和/或钾（K(+)）对蚕豆（品种TARA）叶片在镉胁迫下抗氧化系统、脯氨酸（Pro）积累、丙二醛（MDA）以及光合色素、镉（Cd）和养分（即Ca(2+)和K(+)）含量的影响。在镉存在的情况下生长的植物表现出生长性状[根长（RL）/株、茎长（SL）/株、根鲜重（RFW）/株、茎鲜重（SFW）/株、根干重（RDW）/株和茎干重（SDW）/株]以及Ca(2+)、K(+)、叶绿素（Chl）a和Chl b含量降低，但MDA、Cd和（Pro）含量除外。与镉胁迫下的对照相比，抗氧化酶[过氧化物酶（POD）和超氧化物歧化酶（SOD）]略有增加。然而，在施加Ca(2+)和/或K(+)的植物中，所有生长性状以及Ca(2+)、K(+)、Chl a、Chl b、Pro含量和抗氧化酶过氧化氢酶（CAT）、POD和SOD的活性均有显著改善。在同时含有Ca(2+)和K(+)的培养基中生长的植物中记录到最大缓解效果。本研究表明，Ca(2+)和/或K(+)的施用对植物生长具有显著的协同效应。此外，Ca(2+)和/或K(+)的施用通过提高抗氧化酶活性和溶质含量，对镉毒性具有高效抗性，从而促进了蚕豆植株的生长。
