Improving the grain filling and yield of indica rice (Oryza sativa L.) through kinetin (6-furfurylaminopurine) application at flowering stage
2010
Malabug, L. U., Philippines Univ. Los Baños, College, Laguna (Philippines)
Pot and field experiments were conducted from September 2008 to May 2009 at the University of the Philippines at Los Baños, College, Laguna, to determine the effect of exogenous kinetin (6-furfurylaminopurine) application at flowering stage on the grain filling and yield of PSB Rc28 (short-duration variety) and PSB Rc18 (medium-duration variety). Based on optimization set-up, kinetin concentration of 50 mg/L, at spray volume of 400 L/ha applied at the onset of flowering was the optimum combination to improve the grain filling and yield of rice. Kinetin application to both varieties increased chlorophyll content at flowering prolonged photosynthesis resulting to more assimilates diverted to the grains during grain filling. Under field condition, the percent filled spikelets of PSB Rc28 was increased by 0.9%, converted to a yield increase of 10.9% (500 kg/ha) compared to the control (with fertilizer but no kinetin application) with a base yield of 4600 kg/ha. On the other hand, the percent filled spikelets of PSB Rc18 was increased by 3.1 % and the 1000-grain weight by 4.1%, translated to a yield increase of 17.8% (800 kg/ha) compared to 4500/kg of the control (with fertilizer but no kinetin application). Based on the findings, exogenous application of kinetin offers an opportunity in increasing the rice yield of medium duration varieties which generally produce high yield containers.
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