Abstract
Upland rice (Oryza sativa) is affected by several biotic and abiotic factors that limit the yield potential of cultivars. In relation to water deficiency, the development of drought tolerant and water efficient cultivars is a priority in breeding programs. With this study aimed to evaluate the agronomic behavior of upland rice lines subjected to different irrigations depths aiming for the selection of genotypes that are tolerant and responsive to water deficiency. Thirty-four recombinant inbreeded lines were evaluated in an experiment using supplementary sprinkling and in a dry test without additional irrigation during the 2015/2016 season. The characteristics evaluated were grain yield, water use efficiency, days for flowering, plant height, and occurrence of rice panicle blast, spikelets number per panicle and spikelet sterility. It was concluded that there were different behaviors of the lines in relation to the level of water that were submitted being possible the selection of genotypes responsive and tolerant to water deficit. Drought tolerance is a complex trait that involves several features in the plant development, being grain yield a good feature to be used by breeding experts to select genotypes, with a view to tolerance to water deficiency. Key words: Oryza sativa, irrigations depths, drought tolerance, water deficiency, inbreed lines.
Highlights
Rice (Oryza sativa) stands out among cultivated cereals as one of the most important, as it constitutes the basic diet of more than 50% of the world's population (Sneyd, 2016)
In relation to number of days for flowering, plant height, rice panicle blast incidence, spikelet sterility and spikelets number per panicle, the joint variance analyses in the experiments conducted were obtained in environments with supplementary irrigation and without supplementary irrigation (Table 1)
From the results described previously regarding grain yield, water use efficiency and other secondary characteristics, these characteristics were analyzed for genetic correlation
Summary
Rice (Oryza sativa) stands out among cultivated cereals as one of the most important, as it constitutes the basic diet of more than 50% of the world's population (Sneyd, 2016). This cereal presents nutritional balance, an excellent source of energy, vitamins and proteins necessary for human growth, and considered the crop with the greatest potential to fight world’s hunger when production is increased. The lack or limited availability of water is the main factor that restricts the yield and rarely occurs separately, since it frequently interacts with other abiotic factor ( extreme temperatures) and with biotic stress (Bianchi et al, 2016).
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