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Acta Agron Sin ›› 2011, Vol. 37 ›› Issue (04): 661-669.doi: 10.3724/SP.J.1006.2011.00661

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

Effects of Potassium and Calcium on Root Exudates and Grain Quality during Grain Filling

LIU Li-Jun,CHANG Er-Hua,FAN Miao-Miao,WANG Zhi-Qin,YANG Jian-Chang*   

  1. Key Laboratory of Crop Genetics and Physiology of Jiangsu Province, Yangzhou University, Yangzhou 225009, China
  • Received:2010-09-26 Revised:2011-01-06 Online:2011-04-12 Published:2011-02-24
  • Contact: 杨建昌, E-mail: jcyang@yzu.edu.cn, Tel: 0514-87979317, Fax: 0514-87979317

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Abstract: Potassium (K) and Calcium (Ca) play important roles in regulating plant growth and development. The purpose of this study was to investigate how K and Ca nutrients affect the changes in the root exudates and their relations with appearance quality, eating and cooking quality using two rice cultivars, Yangdao 6 (indica) and Yangjing 9538 (japonica). Five treatments, 0K (without K), 1/2K (1/2 K of the standard Espino nutrition solution), 0Ca (without Ca), 1/2Ca (1/2 Ca of the standard Espino nutrition solution), and CK (standard Espino nutrition solution) were conducted from the heading stage to maturity. The results showed that 0K significantly decreased root activity, ATPase activity and the concentrations of citric acid, and Ca2+, K+, and NH4+ in the root exudates, accelerated root senescence. The treatment of 0Ca significantly decreased the concentrations of oxalic acid, Ca2+, K+ and NH4+ in the root exudates. The concentration of oxalic acid was very significantly and positively correlated with chalky kernel percentage, chalkiness and gel consistency in rice. And the concentration of citric acid was very significantly and negatively correlated with chalky kernel percentage, chalkiness and the value of breakdown, whereas very significantly and positively correlated with the value of setback. The concentrations of K+ and Ca2+ in root exudates during early or middle grain filling period (10 d or 20 d after heading stage) were significantly or very significantly and negatively correlated with chalky kernel percentage, chalkiness and amylose content. The concentration of NH4+ in the root exudates was also very significantly and negatively correlated with amylose content in rice grains. These results indicate that root exudates are closely associated with grain quality, and K and Ca could regulate root exudates, and consequently, affect grain quality in rice.

Key words: Rice, Potassium, Calcium, Root exudates, Grain quality

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