Scientia Agricultura Sinica ›› 2016, Vol. 49 ›› Issue (4): 643-656.doi: 10.3864/j.issn.0578-1752.2016.04.004

• TILLAGE & CULTIVATION·PHYSIOLOGY & BIOCHEMISTRY • Previous Articles     Next Articles

Effect of Source-Sink Manipulation on Translocation of Carbohydrate and Nitrogen, Phosphors, Potassium in Vegetative Organs of Conventional Japonica Rice After Anthesis

XU Bei-bei, YOU Cui-cui, DING Yan-feng, WANG Shao-hua   

  1. College of Agronomy, Nanjing Agricultural University/Jiangsu Collaborative Innovation Center for Modern Crop Production / Key Laboratory of Crop Physiology and Ecology in Southern China, Ministry of Agriculture, Nanjing 210095
  • Received:2015-07-20 Online:2016-02-16 Published:2016-02-16

Abstract: 【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 cultivars, 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(L0S0), 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.

Key words: conventional japonica rice, source-sink, leaf cutting and spikelet thinning, spikelets per panicle/leaf area per culm;N/P/K translocation

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