Effect of low water supplies on agronomical and industrial behavior of new rice (Oryza sativa L.) genotypes obtained by different improvement methods
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Abstract
cultivation, as well as, of a group of mutants and crosses under
low water supply conditions was studied at «Los Palacios»
Rice Research Station from National Institute of Agricultural
Sciences during poorly rainy, 2006, and rainy, 2007 stations.
The genotypes 8476, 8479, 8480 (obtained by somatic culture),
8551, 8552, 8553, 5454 and 8555 (mutations), Amistad-82,
Reforma varieties (crossing) and the commercial J-104 as a
control variety. To cause the conditions of low water supplies,
the following handling was used: the water lamina was
established at 15 days after seed germination, the water entrance was suspended at 35 days after germination and it was again recovered from the primordium change until 50 % flowering stage. At harvest time, the final plant height, cycle, agricultural yield (t.ha-1) and its components were evaluated, also, the industrial yield (% of whole grains), as well as resistance to lodging, shattering, Pyricularia grisea, Sarocladium oryzae, Steneotarxonemus spinki, Borer smiley and grain
discoloration. Results showed that 8554 genotype and
Reforma variety reached excellent agricultural and industrial
yields as well as a good behavior to principal diseases that
affect economically this crop as the grain discoloration.
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