POTENCIAL FISIOLÓGICO DE GENÓTIPOS DE SEMENTES DE ARROZ SUBMETIDOS AO ESTRESSE SALINO
POTENCIAL FISIOLÓGICO DE GENÓTIPOS DE SEMENTES DE ARROZ SUBMETIDOS AO ESTRESSE SALINO
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DOI: https://doi.org/10.22533/at.ed.9762517096
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Palavras-chave: arroz irrigado; salinização; tolerância à salinidade; vigor de sementes
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Keywords: irrigated rice; salinization; salinity tolerance; seed vigor
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Abstract: Rice (Oryza sativa L.) is the most important cereal for human consumption. In the state of Maranhão, rice is cultivated in almost all municipalities, highlighting the social importance of this crop. Despite its relevance, the productivity of rice cultivation in Maranhão is below the national average, mainly due to soil and/or water salinization. In this context, the present study aimed to evaluate the physiological potential of O. sativa seeds and the initial development of salinity tolerant seedlings, selecting the genotypes with greater vigor. Fifteen seed lots were submitted to the following levels of osmotic potential: 0, 100, 200, 300 and 400 mM NaCl / L-1. The seeds were evaluated for water content, germination tests, first germination count, germination speed index and seedling root and shoot lengths. The experimental design was completely random, with treatments distributed in four replicates in a factorial scheme, 15 x 5 (number of lots and osmotic potentials). Germination tests, first germination counts, germination speed index, and seedling root and seedling lengths are efficient in assessing the physiological potential of rice seed lots, providing sufficient information to classify lots as to the level of vigor. The genotypes of rice respond differently to saline stress, with lot 2 being the most tolerant to salinity when evaluated by the physiological potential of the seeds up to the limit of 100 mM NaCl concentration.
- Paulo Alexandre Fernandes Rodrigues de Melo
- Janaína Marques Mondego
- Edna Ursulino Alves
- Paulo Henrique de Aragão Catunda
- Tiago Pedó
- Edmilson Igor Bernardo Almeida
- Barbara Gabrielle Silva Durans
- Glória Mirelly Borges Da Cruz