Relationships of non-structural carbohydrates accumulation and translocation with yield formation in rice recombinant inbred lines under two nitrogen levels
2011
Pan, Junfeng | Cui, Kehui | Wei, Dong | Huang, Jianliang | Xiang, Jing | Nie, Lixiao
Stem non-structural carbohydrates (NSCs) and its relationship with yield formation was investigated under low nitrogen (LN) and normal nitrogen (NN) treatments, using 46 recombinant inbred lines from Zhenshan 97 × Minghui 63 (Oryza sativa). Apparent contribution of transferred NSC to grain yield (ACNSC) ranged from approximately 1 to 28% under LN and from 1 to 15% under NN. Concentration and total mass of NSC in stem (TMNSC) at heading, apparent transferred mass of NSC (ATMNSC) and ACNSC were larger under LN compared with NN. However, there was no significant difference in the apparent ratio of transferred NSC from stems to grain (ARNSC). ATMNSC was positively correlated with grain yield, 1000-grain weight and ACNSC under both nitrogen levels, whereas ARNSC was highly correlated with harvest index and ACNSC. Leaf area contributed more strongly to grain yield compared with ATMNSC under both LN and NN. ATMNSC showed larger direct effects on grain yield under LN compared with NN. TMNSC at heading, small vascular bundles (SVBs) and spikelets per m² under LN had positive direct effects on ATMNSC. SVB and spikelets per m² under LN had larger and positive direct effects, and large vascular bundles had negative direct effects on ARNSC. TMNSC at heading and SVB under LN had positive direct effects on ACNSC. In brief, LN supply increased stem NSC accumulation and translocation to developing grain. Components of the source-sink-flow system showed different effects on NSC translocation and contribution to yield formation, depending on genotype and nitrogen level.
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