Cadmium toxicity-induced proline accumulation is coupled to iron depletion

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• 作者：P. Sharmila ; P. Kusuma Kumari ; Kavita Singh ; N. V. S. R. K. Prasad…
• 关键词：Cadmium toxicity ; Iron ; Proline ; Photosystem II ; Brassica juncea
• 刊名：Protoplasma
• 出版年：2017
• 出版时间：March 2017
• 年：2017
• 卷：254
• 期：2
• 页码：763-770
• 全文大小：
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Cell Biology; Plant Sciences; Zoology;
• 出版者：Springer Vienna
• ISSN：1615-6102
• 卷排序：254

文摘

Investigations were conducted to elucidate the key factor behind Cd2+-toxicity-induced proline accumulation in Indian mustard (Brassica juncea) by raising seedlings, independently in distilled water (DW) and mineral growth medium (MGM) in the presence of 0–500 μM CdCl₂. Invariably, Cd2+-induced toxicity, measured in terms of growth, was significantly more prominent in seedlings raised in DW than those raised in MGM. Cd2+ brought about a significant reduction in growth and photosystem II activity with a concomitant increase in proline levels, in a concentration-dependent manner. Interestingly, the level of iron in shoots of seedlings decreased proportionately with increase in Cd2+ toxicity. Cd2+-promoted proline accumulation was significantly higher in seedlings raised in DW than those raised in MGM. Depletion of essential cations (viz. Ca2+, Mg2+, K+, and Fe2+) from MGM one at a time revealed that depletion of Fe2+ leads to maximal proline accumulation under Cd2+ toxicity. Interestingly, proline level in seedlings raised under Cd2+ toxicity in DW supplemented with Fe2+ was similar to that recorded in seedlings raised in MGM. Our results convincingly demonstrated that Cd2+-induced iron deficiency promotes proline accumulation.