Grain yield, assimilation products accumulation and transportation, and nitrogen (N) uptake and utilization of 18 hybrid indica rice combinations were measured under two nitrogen levels (0 kg/hm2 and 180 kg/hm2), then the 18 rice combinations were classified by cluster analysis according panicle weight and the differences in above indexes among various panicle types were compared. The results showed that the 18 rice combinations were classified into 4 types: large panicle type (A type), medium to large type (B type), medium to small type (C type) and small type (D type). N fertilizer application increased panicle weight, and the clustering results remained unchanged regardless of nitrogen application level. Grain yield of the four panicle types imporved with increasing panicle weight, and the large panicle type rice got the highest yield under both two N levels owing to its superiority in total dry matter accumulation (TDA), higher proportion of dry matter accumulation after anthesis(DAAA) under zero nitrogen level and more equitable accumulation of dry matter under Nsufficient level. Export of stemsheaths (ESS) showed close relationships with both panicle types and N levels, and N fertilizer application could increase ESS of A and B types effectively. There were significant differences in N uptake and utilization among the 4 panicle types. Total nitrogen accumulation (TNA) of A and B types were significantly higher under both N levels. With the largest nitrogen uptake, B type rice showed weaker N utilization ability compared with A type. Due to equitable nitrogen accumulation before and after anthesis, powerful nitrogen translocation (VTN) ability of vegetative organs and rational assimilation product distribution to panicle the nitrogen dry matter production efficiency (NDMPE) and nitrogen grain production efficiency (NGPE) of A type rice were outstanding.
QIN Jian, YANG Zhiyuan, SUN Yongjian, XU Hui, MA Jun*
. Differential Comparison of Assimilation Products Accumulation, Nitrogen Uptake and Utilization and Grain Yield of Hybrid indica Rice Combinations with Different Panicle Types[J]. Chinese Journal OF Rice Science, 2014
, 28(5)
: 514
-522
.
DOI: 10.3969/j.issn.1001-7216.2014.05.009
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