Chinese Journal OF Rice Science >
Grain Yield and Quality and Physiological and Biochemical Characteristics of Flag Leaf in Early Rice as Affected by Submergence at Filling Stage
Received date: 2015-03-11
Revised date: 2015-05-13
Online published: 2016-03-10
The early hybrid rice Tianyou 998 and the early conventional rice Guinongzhan were submerged at filling stage to evaluate submergence effects on grain yield, rice quality, and physiological and biochemical characteristics of the flag leaf. The depth of submergence were 2/3, and all of rice plant height lasting 0d,1d,3d,5d and 7d(0 d as CK). The results showed that the plant height increased after submergence and the increments in plant height peaked after 5-7 days of submergence. The grain yield and rice quality decreased significantly after submergence at a depth of 2/3 plant height and complete submergence lasting 1-3 days at the filling stage, especially after complete submergence lasting 5-7 days. The yield decrease was mainly due to reduced effective panicle number after submergence. The grain yield and rice quality varied insignificantly with variety under the same submergence conditions. The free proline and MDA contents in flag leaf increased; however, the SPAD value and the SOD activity decreased following submergence at the filling stage and the variation increased as the depth and duration of submergence increased. The SPAD value and the MDA content, significantly or extremely significantly correlated with grain yield and rice quality at the filling stage, are two physiological indices.
Key words： submergence; early rice; filling stage; flag leaf; physicochemical properties; yield; quality
Jing-hua JI, Zhi-guo HUO, Li-sheng TANG, Yao-dong DU, Fei HU . Grain Yield and Quality and Physiological and Biochemical Characteristics of Flag Leaf in Early Rice as Affected by Submergence at Filling Stage[J]. Chinese Journal OF Rice Science, 2016 , 30(2) : 181 -192 . DOI: 10.16819/j.1001-7216.2016.5045
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