subject area of Adaptation to flooding in upland and lowland ecotypes of Cyperus rotundus, a troublesome sedge weed of rice: tuber morphology and carbohydrate metabolism. Breeding for drought tolerance: Direct selection for yield, response to selection and use of drought-tolerant donors in upland and lowland-adapted populations Evaluation of Al-tolerance on upland and lowland types of NERICA lines under hydroponic conditions Farmers' Perceptions on Rice Varieties in Sikasso Region of Mali and their Implications for Rice Breeding Impacts of climate change on rice production in Africa and causes of simulated yield changes Opportunities to improve phosphorus efficiency and soil fertility in rainfed lowland and upland rice ecosystems Rewarding the upland poor for saving the commons? Evidence from Southeast Asia Screening of rice Genebank germplasm for yield and selection of new drought tolerance donors qDTY12.1: a locus with a consistent effect on grain yield under drought in rice