Phosphorus accumulation in grains of japonica rice as affected by nitrogen fertilizer
- 836 Downloads
Background and aims
This study aims to investigate the effect of nitrogen (N) on grain phosphorus (P) accumulation in japonica rice.
Six cultivars with contrasting agronomic traits were grown for 3 years (from 2008 to 2010) of field experiments under seven N treatments and 1 year (in 2010) of pot experiments with five N treatments to study the effect of N on grain phosphorus accumulation and to explore its physiological foundation.
Grain total P and phytic acid concentration showed a clearly decreasing trend as N rate increased for both field and pot experiments. Pot experiment revealed that application of N increase plant biomass, but tended to lower plant P uptake, especially for the split topdressing treatments. Both harvest index (HI) and P harvest index (PHI) increased with N rate, but PHI was consistently higher than HI, indicating the larger proportion of P translocation to grain than that of dry matter by N. Further, ratio of PHI/HI differed significantly among genotypes, but was stable across contrasting N treatments.
The combination of decreased plant P uptake and dilution effect of increased grain yield by N is proposed as underlying mechanism of the decreased grain P concentration by high N.
KeywordsPhosphorus accumulation Nitrogen Grain Japonica rice
Control of N fertilizer treatment
Coefficient of variation
High nitrogen rate
Low nitrogen rate
Moderate nitrogen rate
This research was supported by grants from Program for New Century Excellent Talents in University (NCET-10-0472) and National Natural Science Foundation of China (30971733 and 31171485).
- Frederick FF (2004) Rice proteins. In: Champagne ET (ed) Rice chemistry and technology, 3rd edn. American Association of Cereal Chemists, Inc, St. Paul, pp 143–162Google Scholar
- Lott JNA, Ockenden I, Raboy V, Batten GD (2000) Phytic acid and phosphorus in crop seeds and fruits: a global estimate. Seed Sci Res 10:11–33Google Scholar
- Lott JNA, Bojarski M, Kolasa J, Batten GD, Campbell LC (2009) A review of the phosphorus content of dry cereal and legume crops of the world. Int J Agric Resour Gov Ecol 8:351–370Google Scholar
- Ogawa M, Tanaka K, Kasai Z (1979) Accumulation of phosphorus, magnesium and potassium in developing rice grains: followed by electron microprobe X-ray analysis focusing on the aleurone layer. Plant Cell Physiol 20:19–27Google Scholar
- Raboy V (2009) Seed phosphate. In: Bennetzen JL, Hake SC (Eds) Handbook of maize: its biology. Springer, New York, pp 149–437Google Scholar