This document discusses developing rice varieties that are adapted to temperate regions, climate change, and low-input conditions. Researchers have introduced the Pup1 gene to enhance phosphorus efficiency in temperate rice under low P input and rainfed conditions. They identified 5 QTLs for panicle length on chromosomes 1, 2, 9, and 11 using indica-japonica RILs under low P and rainfed conditions in the tropics. Introgression lines with Pup1 had higher yield than parents, except for one variety. The study aims to develop climate-ready rice using QTL pyramiding.