Scientia Agricultura Sinica ›› 2012, Vol. 45 ›› Issue (23): 4782-4793.doi: 10.3864/j.issn.0578-1752.2012.23.004

• TILLAGE & CULTIVATION·PHYSIOLOGY & BIOCHEMISTRY·AGRICULTURE INFORMATION TECHNOLOGY • Previous Articles     Next Articles

Effect of Water-Saving Irrigation on the Grain Yield of Water-Saving and Drought-Resistance Rice and Its Physiological Bases

 ZHANG  Hao, JU  Cheng-Xin, CHEN  Ting-Ting, CAO  Zhuan-Qin, WANG  Zhi-Qin, YANG  Jian-Chang   

  1. Key Laboratory of Crop Genetics and Physiology of Jiangsu Province, College of Agriculture, Yangzhou University, Yangzhou 225009, Jiangsu
  • Received:2012-07-05 Online:2012-12-01 Published:2012-08-23

Abstract: 【Objective】 This study aimed to understand the yield formation characteristics of water-saving and drought-resistance rice cultivars and their physiological bases under water-saving irrigation. 【Method】 Two water-saving and drought-resistance cultivars, Hanyou 113 (an indica hybrid cultivar) and Hanyou 8 (a japonica hybrid cultivar), and two local high-yielding cultivars, Liangyoupeijiu (a two-line indica hybrid cultivar) and Yangfujing 8 (a japonica cultivar), were grown in cement tank and field. Two irrigation regimes, conventional irrigation and water-saving irrigation, were imposed from 10 days after transplanting to maturity. 【Result】 Compared with that under the conventional irrigation, grain yield of local high-yielding cultivars were significantly decreased under the water-saving irrigation, whereas the difference in grain yields of water-saving and drought-resistance cultivars was not significant between the two irrigation regimes. The water-saving irrigation significantly reduced the amount of irrigation water and increased irrigation water productivity (grain yield/amount of irrigation water), with more increase in water-saving and drought-resistance cultivars than in local high-yielding cultivars. In comparison with local high-yielding cultivars, water-saving and drought-resistance cultivars showed higher relative tiller number and spikelet number per panicle (tiller or spikelet number under conventional irrigation/tiller or spikelet number under water-saving irrigation), greater percentage of filled grains, longer leaf area duration during the growing season, higher root weight at heading, and greater or higher root oxidation activity, content of cytokinins (zeatin + zeatin riboside) in roots and leaves, photosynthetic rate of the flag leaf, and activities of sucrose synthase and adenosine diphosphate-glucose pyrophosphorylase in grains after heading, and more dry matter accumulation and more remobilization of non-structural carbohydrate from stems to grains during grain filling, and higher harvest index. Results from the cement tank and field experiments were very similar.【Conclusion】Water-saving and drought-resistance cultivars could obtain a higher grain yield and higher water use efficiency than local high-yielding cultivars under water-saving irrigation. Better root traits and stronger physiological activities of aboveground plants of water-saving and drought-resistance cultivars contribute to their higher grain yield and higher water use efficiency under water-saving irrigation.

Key words: rice, water-saving irrigation, water-saving and drought-resistance cultivar, grain yield, water use efficiency, physiological characteristics

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