Tolerance of upland rice genotypes to water deficit

Guimarães, C. M.; Stone, L. F.; Rangel, P. H. N.; Silva, Ana C. de L.

doi:10.1590/s1415-43662013000800001

Cited by 15 publications

(9 citation statements)

References 15 publications

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“…Rice tolerates these soil limitations, allowing the exploitation of large areas (Guimarães et al, 2013). This region mostly presents uneven distribution of rainfall, with the occurrence of "dry spells", which are periods without rain during the rainy season (Crusciol et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Evapotranspiration and grain yield of upland rice as affected by water deficit

Guimarães

Stone

Silva

2016

Rev. bras. eng. agríc. ambient.

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A B S T R A C TTo achieve an accurate phenotyping for drought tolerance, it is important to control water stress levels and timing. This study aimed to determine water use by upland rice plants during periods of irrigation withholding and its relationship with grain yield in order to increase the efficiency of this phenotyping. Two experiments were carried out in a randomized block design in which six water treatments (irrigation withholding for periods of 2, 4, 6, 8, 10 and 12 days) were compared, with four replicates. In the first experiment, treatments were applied at the R3 stage (panicle exsertion) and, in the second, at the R5 stage (beginning of grain filling). The amount of water evapotranspired was determined by the difference between the soil water storage at the beginning and at the end of irrigation withholding periods, from the surface to 80-cm depth. Evapotranspiration of upland rice from R3 stage was higher compared to that observed from R5 stage, when subjected to similar irrigation withholding periods in both growth stages. Rice grain yield is more sensitive to irrigation withholding imposed from R5 stage than from R3 stage.Evapotranspiração e produtividade do arroz de terras altas afetadas pela deficiência hídrica R E S U M O Para se obter fenotipagem acurada para tolerância à deficiência hídrica, é importante controlar o nível de estresse hídrico e a época de sua aplicação. Este trabalho objetivou determinar o uso de água pelas plantas de arroz de terras altas durante períodos de supressão da irrigação e sua relação com a produtividade de grãos, para aumentar a eficácia desta fenotipagem. Foram conduzidos dois experimentos no delineamento de blocos ao acaso e comparados seis tratamentos hídricos (supressão da irrigação por períodos de 2, 4, 6, 8, 10 e 12 dias) com quatro repetições. No primeiro experimento os tratamentos foram aplicados no estádio R3 (emissão das panículas) e no segundo, no estádio R5 (início do enchimento de grãos). A água evapotranspirada foi determinada pela diferença entre o armazenamento de água no solo no início e no fim dos períodos de supressão da irrigação, da superfície até 80 cm de profundidade. A evapotranspiração do arroz no estádio R3 foi mais alta comparada com a observada no estádio R5, quando submetida a período similar de supressão da irrigação em ambos os estádios. A produtividade do arroz foi mais sensível à supressão da irrigação imposta a partir do estádio R5 do que do estádio R3.

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Section: Introductionmentioning

confidence: 99%

Evapotranspiration and grain yield of upland rice as affected by water deficit

Guimarães

Stone

Silva

2016

Rev. bras. eng. agríc. ambient.

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“…Additionally, it was observed that the genotypes with a higher number of grains per panicle had a higher spikelet sterility. Guimarães et al (2013) also observed that under water stress the panicles with a higher number of spikelets presented higher sterility. This suggests that for the climate and soil conditions where the experiments were conducted, the immobilization of carbohydrates by the genotypes does not adequately meet the demand of the storage sites for carbohydrates.…”

Section: Resultsmentioning

confidence: 77%

“…The mean yield of the clusters differed significantly in both water treatments (Table 3). Lafitte et al (2006) and Guimarães, Stone, Rangel, and Silva (2013) also observed variability in the grain yield of the rice genotypes subjected to water stress.…”

Section: Resultsmentioning

confidence: 87%

<b>Drought tolerance in upland rice: identification of genotypes and agronomic characteristics

et al. 2016

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ABSTRACT. This study aimed to identify upland rice cultivars and elite lines that are tolerant to drought and the agronomic traits associated with this tolerance. Forty-one genotypes were evaluated in a randomized block design with three replications in experiments with and without water stress at the Experimental Station of Emater, in Porangatu, Goiás State, in 2011 and 2012. The first experiment was well-irrigated throughout plant development and the second experiment was irrigated only up to 40 days after emergence, after which water stress was imposed. A multivariate analysis using Ward's method was applied, and the genotypes with and without water stress were classified into six and seven clusters, respectively, based on the average yield in the two years of experimentation. The most productive cluster under water stress comprised the genotypes AB062041, Douradão, Guarani, BRS Aimoré, and Tangará. The first four genotypes of this cluster were also ranked in the second most productive cluster under well-irrigated conditions. In the selection for drought tolerance, the genotypes that exhibit precocity, less dense panicles, low sterility and greater 100-grain weight under water stress should be prioritized.

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“…Centrito et al (2009), applying water deficit from the flowering stage until the beginning of physiological maturity, also found a significant decrease in aboveground dry mass and grain yield, that varied among rice genotypes, being the most productive those genotypes which showed higher photosynthesis and mesophyll and stomata conductances. Kamoshita et al (2004) and Guimarães et al (2013;2016) also observed genetic variation in rice performance when subjected to water deficit.…”

Section: Genotypementioning

confidence: 87%

Performance of low phosphorus tolerant rice genotypes under drought stress

et al. 2018

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The identification of genotypes more tolerant to water deficit and more efficient in the use of nutrients little available in the soil is an important low-cost strategy to promote sustainable agriculture in marginalized regions. In this sense, a study was carried out in the SITIS Phenotyping Platform of the Embrapa Arroz e Feijão, with the objective of evaluating the drought tolerance of upland rice genotypes tolerant to phosphorus (P) deficiency. The experimental design was performed in a randomized complete block with split-split plots and two replications. In the plots were established two water regimes (with and without water deficit), in the subplots two soil phosphorus contents (25 and 200 mg dm-3) and in sub-subplots 48 upland rice genotypes. The water deficit had more impact on grain yield than the phosphorus supply. The genotypes AB 062037, AB 062041, AB 062138, Arroz Mato Grosso, BRA 02601, BRA 052045, CNA 4098, CNA 6187, Guapa, Guaporé and Rio Paranaíba were classified in the most productive group under both water regimes. The most productive genotypes under water deficit showed higher root density in the deeper soil layers. The most productive genotypes in the two water regimes were also those that showed the highest transpiration.

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Tolerance of upland rice genotypes to water deficit

Cited by 15 publications

References 15 publications

Evapotranspiration and grain yield of upland rice as affected by water deficit

Evapotranspiration and grain yield of upland rice as affected by water deficit

<b>Drought tolerance in upland rice: identification of genotypes and agronomic characteristics

Performance of low phosphorus tolerant rice genotypes under drought stress

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