Section of Field Corn Inbred Line for High Yield and Drought Tolerance Using Smith’s Selection Index
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Abstract
The objective of this study was to select the inbred line generation S7 having high yield and drought tolerance using smith’s selection index. Two hundred inbred line from generation S7 was compared under water stress during the flowering stage compared with normal condition (well-watered) at Nakhon Sawan Field Crops Research Center during the dry season (November 2021 – March 2022). The results showed grain yield under normal conditions (well-watered) average of 330 kg/rai and grain yield under water stress during the flowering stage average of 212 kg/rai. Grain yield is a positive correlation with drought index and the number of ears per plant negatively correlated with leaf senescence, leaf rolling, and anthesis-silking interval. Smith’s selection index uses 6 traits including grain yield and correlation traits and set their economic weight as 1, 1, 1, -1, -1 and -1 respectively. The results able to select 20 inbred lines having grain yield average of 487 kg/rai drought Index average 1.04 number of ear per plant average of 1 ear/plant leaf senescence average 3 leaf rolling average 2 anthesis-silking interval average 0 day which is consistent with the goal of selection inbred line high yield under water stress during the flowering stage low leaf senescence low leaf rolling and nearby anthesis-silking interval.
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