Abstract
Abstract – Low temperatures reduce rice grain yield, especially when they occur at the crop microsporogenesis. This study was conducted aiming at identifying paddy rice genotypes tolerant to the cold stress at microsporogenesis. Seventeen genotypes from the Epagri’s breeding program were evaluated. The plants were grown in the greenhouse from sowing to microsporogenesis, when they were moved to the growth chamber for a 72-hour period of cold stress, with a night temperature of 12oC and a day temperature of 15oC. Each genotype had a control kept in the greenhouse with temperatures ranging from 25oC to 30oC during the whole crop cycle. Spikelet sterility and grain production were determined. Data were evaluated by Variance Analysis using the F test and averages were compared by the Skott Knott’s test at a 5% significance level. The inbreeds SC 854 and SC 850 showed potential to generate future cultivars tolerant to cold stress at microsporogenesis. Inbreeds SC 806 and SC 491ME, although presenting low spikelet sterility and good grain production, had instability when the two environments were compared. The inbreed SC 790 was considered very sensitive to cold at microsporogenesis.
Highlights
Low temperatures reduce rice grain yield, especially when they occur at the crop microsporogenesis
As linhagens SC 806 e SC 491 ME apresentaram baixa esterilidade tanto em condições de submissão ao estresse por frio, como na ausência de estresse, o que demonstra a estabilidade desses materiais frente a diferentes regimes térmicos, podendo ser considerados genótipos promissores, candidatos a futuros cultivares
Plant Cell Culture & Micropropagation, Lavras. v.10, n.2, p.32-40, 2014
Summary
Francieli Weber Stürmer, Rubens Marschalek, Luis Sangoi e Natália Maria de Souza. Resumo – Baixas temperaturas reduzem o rendimento do arroz, especialmente quando ocorrem na microsporogênese da cultura. O cultivo das plantas foi em casa de vegetação da semeadura até a microsporogênese, quando foram transferidas para câmara de crescimento por 72 horas, à temperatura noturna de 12°C e diurna de 15°C. The inbreeds SC 854 and SC 850 showed potential to generate future cultivars tolerant to cold stress at microsporogenesis. As baixas temperaturas durante a fase de prefloração (microsporogênese) têm maiores efeitos sobre o rendimento de grãos devido ao aumento da esterilidade das espiguetas (TERRES, 1991). O trabalho foi conduzido com o objetivo de avaliar o efeito de baixas temperaturas na fase de microsporogênese sobre a esterilidade de espiguetas e produção de grãos de genótipos de arroz irrigado, a fim de identificar materiais promissores quanto à tolerância a essa condição
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