Effect of Source-Sink Manipulation on Translocation of Carbohydrate and Nitrogen, Phosphors, Potassium in Vegetative Organs of Conventional Japonica Rice After Anthesis
[Objective] This study investigated how source-sink relationship manipulation could affect dry matter,non-structural carbohydrate,nitrogen (N),phosphorus(P) and potassium(K) nutrient translocation of rice after anthesis and clarify the SPP/LAPC that promotes nutrient efficient recycling in rice.[Method]Two japonica rice eultivars,Huaidao 5 and Ningjing 3 were field grown in 2013 and 2014.Leaf-cutting and spikelet-thinning treatments were made on single stems with 6 leaves and consistent flowering process to regulate source-sink relationship at heading stage,define the ratio of spikelets per panicle and leaf area per culm as SPP/LAPC,dry matter,non-structural carbohydrate(NSC),nitrogen,phosphorus and potassium translocation rate (including leaf and stem-sheath) of two cultivars were measured in heading to harvesting period,so as to study the relationship between dry matter/NSC and nutrient translocation,and the relationship between SPP/LAPC and nutrient translocation of leaf and stem-sheath,respectively.[Result]Compared to the control(LoS0),leaf-cutting treatment significantly decreased filled-grain percentage and 1000-grain weight as SPP/LAPC increased significantly,Huaidao5 reduced 8.6％-10.5％ and 19.0％-8.0％,respectively,Ningjing3 reduced 9.7％-20.4％ and 5.7％-12.6％,respectively;whereas spikelet-thinning treatment significantly increased filled-grain percentage and 1000-grain weight as SPP/LAPC decreased significantly,Huaidao5 average increased 3.4％-6.7％ and 1.2％-18.7％ by an average,Ningjing3 increased 2.0％-4.3％ and 6.9％-17.3％ by an average.Percentage of ripened grains and 1000-ripened grain weight showed no significant difference between different spikelet-thinning treatments of the same variety,but differed in years.The 2014 rice season weather was more beneficial to grain filling,filled-grain rate,1000-grain weight and their increasing range when compared with 2013.Leaf-cutting treatment increased dry matter,NSC and nutrient translocation rate of leaf and stem-sheath from heading to maturity,there were no significant difference between variety and year;whereas performance of indexes mentioned above in spikelets thinning treatments were just on the contrarY,different varieties and different years showed no substantive differences,either.There were fundamental differences between leaves and stem-sheath in translocation of dry matter and NSC,transport rate of dry matter and NSC in leaves declined as spikelet thinning proportion increased,while matters mentioned above detained in stem-sheath on apparent.There was a curvilinear correlation(y=(a+bx)/x) between SPP/LAPC at heading stage(x) and dry matter,NSC and nutrient transport rate in leaves and stem-sheath after anthesis (y) with further analysis.Nutrient transport rate of leaves and stem-sheath increased significantly with the increase of SPP/LAPC.While the SPP/LAPC increased around 1.5,transport rate of dry matter,NSC and nutrient approximated to maximum,there were no obvious differences between Huaidao5 and Ningjing3.[Conclusion] A relatively high SPP/LAPC was beneficial to translocation of dry matter,NSC and nutrient in vegetative organs in rice after anthesis,there was a close curvilinear correlation between SPP/LAPC and matters mentioned above in vegetative organs in rice after anthesis,translocation rate reached a maximum when SPP/LAPC was 1.5.The critical SPP/LAPC around 1.5 can be used as the basis for variety breeding and cultivation regulation in mineral nutrients' efficient reutilization of conventional japonica rice.
conventional japonica ricesource-sinkleaf cutting and spikelet thinningspikelets per panicle/leaf area per culmN/P/K translocation
国家科技期刊平台
NSTL
万方数据
维普
