Abstract
The rice is large-scale cultivated in a wide range of edaphic and climatic conditions, compounding an alternative source for the increase in food production worldwide. The present study assessed the traits related to productivity, in rice genotypes under conditions of irrigation and water stress, in Gurupi municipality, Southern region from Tocantins state. We evaluated agronomic attributes (number of tillers and panicles, number of grains per panicle and productivity), besides the index of drought sensitivity. The selection of superior genotypes and traits that may serve for the differentiation among the genotypes in this stress condition is essential to create more tolerant materials. Among the most productive genotypes, we highlight the ‘Quebra Cacho’ that besides presenting relatively high productivities for both culture conditions, also presented a low index of drought sensitivity, ratifying itself as one of the most productive ones and adapted to this culture condition. The number of tillers by square meter did not present differences among the genotypes in both environmental conditions, but in some cases, there was a decrease under the condition of water stress. The number of grains per panicle evidenced great variation between the environments, with a decrease under the stress condition.
Highlights
Rice is a hydrophilic species, cultivated in more than 148 million hectares in varying temperatures and water regimes
Regarding the importance of choice of rice cultivars tolerant to drought, the present study aimed to evaluate the traits related to productivity, in rice genotypes, under conditions of irrigation, in accordance to the culture needs, and water stress, in Gurupi municipality, Southern region from Tocantins state
The materials ‘Quebra Cacho’, ‘Muruim Branco’, ‘Santo Américo’, ‘Paulista’ and ‘BRS Sertaneja’ presented lower number of panicles when submitted to water stress
Summary
Rice is a hydrophilic species, cultivated in more than 148 million hectares in varying temperatures and water regimes. The largest production and consumption of rice occurs in Asia, representing more than 90% of world production, and in all producing countries, the rice is the staple diet, providing from 50 to 80% of daily calories for the population of the region (MACLEAN et al, 2002). The rice is the culture with the higher potential of yield increase, becoming an important alternative to fight hunger that plagues the world. About 13% of the rice are cultivated in uplands, without accumulation of water on the surface, and are always influenced by the water during its development (BABU et al, 2003), and may affect the stability and production in these regions
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