Journal
THEORETICAL AND EXPERIMENTAL PLANT PHYSIOLOGY
Volume 27, Issue 1, Pages 19-29Publisher
BRAZILIAN SOC PLANT PHYSIOLOGY
DOI: 10.1007/s40626-014-0028-9
Keywords
Mineral nutrients; Rice grain; Silicon; Zn regimes
Categories
Funding
- University Deputy of Research
- Office of Higher Education
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This study has evaluated the effects of Si application on the vegetative and reproductive growth and organ-specific mineral content of rice plants under different Zn supplies. Zinc deficiency (1 A mu g L-1 Zn) significantly decreased vegetative and reproductive growth. These decreases were accompanied by declined Zn and increased Fe contents. Zinc supply up to 50 A mu g L-1 resulted in greater growth, yield and higher tissue (including seed) Zn as well as K+, Ca2+ and B contents of rice plants. Excess Zn (above 50 A mu g L-1) resulted in retarded growth and reduction in P and K+ contents without any significant effects on seed Zn content. Irrespective of Zn treatments, Si application improved all vegetative and reproductive growth parameters. Silicon application increased Zn as well as Ca2+, K+, P and B contents in plants supplied up to 50 A mu g L-1 Zn. In plants supplied with excess Zn, silicon declined Zn content of roots and shoots, while increased plant K+ and Fe contents. Zn supply up to 50 A mu g L-1 promoted the yield and Zn content of seeds. The beneficial effects of silicon nutrition on vegetative and reproductive growth of rice plants supplied up to 50 A mu g L-1 Zn may be related to increased Zn as well as Ca2+, K+, P and B contents of plants. Positive effects of Si in plants supplied with 100 A mu g L-1 Zn might be attributed to reduced Zn and increased K+ and Fe contents.
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