Photosynthetica, 2013 (vol. 51), issue 2

Photosynthetica 2013, 51(2):231-237 | DOI: 10.1007/s11099-013-0015-4

Photosynthesis and root characteristics of rice (Oryza sativa L.) in floating culture

H. X. Wu1,*, Y. Z. Ma2, J. P. Xiao3, Z. H. Zhang1, Z. H. Shi1
1 Hunan Opulent Seed Industry Technology Co., Ltd., Huaihua Hunan, China
2 School of Life Science and Technology, Central South University of Forestry and Technology, Changsha Hunan, China
3 Huaihua Vocational Technology College, Huaihua Hunan, China

To address the issue of water eutrophication and to use water more effectively, we conducted experiments on rice (Oryza sativa L.) grown in floating culture. From 2009 to 2011, we compared the photosynthesis and root characteristics of the rice, hybrid line Zhuliangyou 02, grown under a conventional tillage and in a floating culture in Huaihua, the home of hybrid rice. Rice in the floating culture showed a higher net photosynthetic rate and stomatal conductance than that under the conventional tillage. The activities of phosphoenolpyruvate carboxylase and NADP-malic enzyme were 32 and 28% higher, respectively, in rice in the floating culture than under the conventional tillage. Rice in the floating culture also showed significantly greater number of roots, root activity, and antioxidant enzyme activity than that under the conventional tillage. Compared with rice under the conventional tillage, rice in the floating culture had 18 and 24% higher tiller number and effective panicle number, respectively. These results suggested that the floating culture system can promote rice production through enhancing root absorption, increasing effective panicle number, and improving the photosynthetic rate. In addition, rice cultivated in the floating culture could remove excess nutrients from water, which addresses the problems of a lack of arable land and water pollution.

Keywords: eutrophic lake; photosynthetic characteristics; productivity; root characteristics; tillage

Received: May 16, 2012; Accepted: December 5, 2012; Published: June 1, 2013Show citation

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Wu, H.X., Ma, Y.Z., Xiao, J.P., Zhang, Z.H., & Shi, Z.H. (2013). Photosynthesis and root characteristics of rice (Oryza sativa L.) in floating culture. Photosynthetica, 51(2), 231-237. doi: 10.1007/s11099-013-0015-4.
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