Journal
PLANT GROWTH REGULATION
Volume 81, Issue 1, Pages 91-101Publisher
SPRINGER
DOI: 10.1007/s10725-016-0191-x
Keywords
Rice (Oryza sativa L.); Silicon; Cadmium; Anti-oxidative enzyme; Lsi1; Cd-stress-related gene
Categories
Funding
- National Natural Science Foundation of China [31271670, 31300336]
- National Research Foundation for the Doctoral Program of Higher Education of China [20133515130001]
- Fujian-Taiwan Joint Innovative Centre for Germplasm Resources and Cultivation of Crops (Fujian Program) [2015,75]
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Cadmium (Cd) pollution is one of the major concerns in the development of sustainable agriculture, particularly for rice production. Silicon (Si) was recently recognized for its ability to mitigate a variety of abiotic stresses including that caused by Cd on rice. However, mechanism of the complex process is still not fully understood. Under Cd-stress, the low Si-influx 1-RNAi transgenic Lemont rice (Lsi1-RNAi line) exhibited an increased Cd-uptake over its counterparts, the wild type and the Lsi1-overexpression transgenic rice (Lsi1-OE line). In contrast, the Lsi1 expression-enhanced Lsi1-OE line showed the greatest Si-uptake among the three lines, with the highest activities on anti-oxidants (such as, superoxide dismutase) and the lowest content of malondialdehyde. Lsi1 also displayed a negative regulation on Low Cd gene and the natural resistance-associated macrophage proteins, Nramp5, indicating its capacity to alleviate Cd-stress on rice. The results obtained by this study suggested that the mitigation of Cd-toxicity on rice by Si might involve functions, such as the inhibition on Cd-uptake and transport and the enhancement on anti-oxidative enzyme activities, as well as the Lsi1-related expression on regulation of Si-uptake in rice. A new avenue might become available for overcoming the rampant pollution that threatens the rice production in China.
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