Journal
PLANT GROWTH REGULATION
Volume 86, Issue 2, Pages 159-167Publisher
SPRINGER
DOI: 10.1007/s10725-018-0418-0
Keywords
Rice bracts; Mineral nutrients; Remobilization; Nitrogen fertilization; Source/sink relation; Iron; Zinc
Categories
Funding
- Special Fund for Agro-scientific Research in the Public Interest [201503130]
- National Natural Science Foundation of China [31771719]
- National High Technology Research and Development Program of China [2014AA10A605]
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The pot experiment with three treatments of nitrogen (N) topdressing was performed with the japonica rice cultivar viz. Huaidao 5. Remobilization of nine mineral nutrients including N, phosphorus (P), potassium (K), calcium (Ca), magnesium (Mg), iron (Fe), zinc (Zn), manganese (Mn), and copper (Cu) was measured from the source organs including bracts, leaf, and sheath to sink rice grain. Experimental results showed considerable contribution of bracts to grain for N, Mg, and Zn, with the averages contributions of 5.96, 12.56, and 12.34%, respectively, indicating a positive role of rice bracts in N, Mg, and Zn remobilization during grain filling. By contrast, minor contribution of bracts to grain P, K, and Cu was revealed, with the contribution rate being 0.99, 3.90, and 3.05%, respectively. Further, a net increase in Ca and Fe concentrations of bracts was detected, implying that bracts function as a sink of these mineral nutrients. In addition, grains produced at a moderate level of N topdressing had higher Fe and similar Zn concentration in comparison with those at high N level, suggesting the possibility of N management for maintaining Fe and Zn level under high yielding conditions.
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