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[Effects of early growth stage shading on rice flag leaf physiological characters and grain growth at grain-filling stage].
- Source :
-
Ying yong sheng tai xue bao = The journal of applied ecology [Ying Yong Sheng Tai Xue Bao] 2009 Sep; Vol. 20 (9), pp. 2135-41. - Publication Year :
- 2009
-
Abstract
- In a pot experiment, rice plants were shaded during the period from transplanting to booting, aimed to study the effects of early growth stage shading on the rice growth at grain-filling stage. Comparing with the control, early growth stage shading decreased the tiller number by 26.72%, but increased the flag leaf area and soluble sugar content by 33.86% and 30.23%, respectively. The filled-grain number per panicle, 1000-grain mass, ultimate brown rice mass, and maximum and average grain-filling rates decreased by 8.65%, 4.81%, 9.74%, 20.22%, and 19.13%, and the effective panicle number and grain yield declined by 25.26% and 39.56%, respectively. The peak time of grain-filling rate (Tm) advanced 1.66 days, while the grain-filling time (T99) prolonged 6.80 days. For shading-tolerance variety, its flag leaf Chl a, Chl b, and Chl (a + b) contents at early and mid grain-filling stages, and the protein N and soluble sugar contents and Chl a/b in its flag leaves at grain-filling stage all increased under early growth stage shading, and the ultimate brown rice mass and 1000-grain mass maintained at the similar levels as the control. Consequently, its grain yield reduction rate was lower than that of shading-sensitive variety.
Details
- Language :
- Chinese
- ISSN :
- 1001-9332
- Volume :
- 20
- Issue :
- 9
- Database :
- MEDLINE
- Journal :
- Ying yong sheng tai xue bao = The journal of applied ecology
- Publication Type :
- Academic Journal
- Accession number :
- 20030134