Performance of second-generation new plant type lines
2005
Ereful, N. | Shaobing, Peng | Laza, M.R.C. | Visperas,R.M. (International Rice Research Inst., DAPO 7777, Metro Manila (Philippines). Crop, Soil and Water Sources Div.)
The breeding of the first-generation new plant type (NPT) lines at the International Rice Research Institute using tropical japonica did not produce rice varieties with the expected yield performance. Although the first-generation NPT lines had the most of the desired morphological traits, their yield performance was not as expected because of low biomass production and low grain-filling percentage. Hence, indica genes were introduced to the tropical japonica background to develop second-generation NPT lines. Five promising second-generation NPT lines were planted on the IRRI farm together with an equal number of popular inbreds and hybrids for comparison in the 2003 and 2004 wet and dry seasons. The experimental design was a randomized complete block with four replicates. Fertilizers applied were 200 kg N/ha during the DS and 70-90 kg N/ha during WS. P, K, and Zn were 30, 40, 50 kg/ha in both seasons. Spacing was 20 x 20 cm with four seedlings per hill. The results showed that the hybrids had the highest maximum and average yeilds, followed by the second-generation NPTs and the inbreds. Total dry matter production and harvest index were generally similar for the three groups. A further yield increase for IRRIs second-generation NPT lines depends on the improvement of grain filling of large panicles with 150 spikelets per panicle. It is necessary to improve the physico-morphological traits of the top three leaves and panicle position within the canopy during the ripening phase in order to meet the requirement of large panicles of a large source supply.
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