The distributions of rice germplasms based on single NAE, NUE or NHI in conventional japonica rice and NHI in hybrid indica rice combinations resembled normal curve approximately.

• 频数分析可知，常规籼稻NAE、NUE及NHI和籼型杂交稻NUE的种质频数分布呈典型正态曲线，低、高效种质较少，中效种质众多；