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Heat stress reduces rice yield by 10% for every degree Celsius increase beyond optimum temperature. Field testing of IR64-derived near-isogenic lines with heat tolerance and early morning flowering QTLs was conducted at CSU Piat during hottest months of 2016-2017. To evaluate how well IR64 NILs tolerated heat, morpho-agronomic data were collected and analyzed when they were subjected to high temperature at field conditions. Flower opening time (FOT), the peak flowering time (PFT), and the time when all of the flowers are closed (FCT) were also determined for early morning flowering traits
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