Características de tolerância à seca em genótipos de uma coleção nuclear de arroz de terras altas

Terra, Thiago Gledson Rios; Leal, Tarcísio Castro Alves de Barros; Rangel, P. H. N.; Oliveira, Aluízio Borém de

doi:10.1590/s0100-204x2015000900007

Cited by 13 publications

(11 citation statements)

References 15 publications

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“…DSI data confirm such differences in drought sensitivity between both cultivars, where BR 16 was more sensitive to WDR than Embrapa 48, while the opposite occurred in relation to WDV (Figure 2). Terra et al (2015) found high correlation between DSI and several traits of interest in rice (Oryza sativa L.), showing that this index can be efficient for selecting tolerant genotypes under water deficit conditions. Du et al (2009) used DSI to develop a soybean linkage map.…”

Section: Discussionmentioning

confidence: 93%

Identification of agronomical and morphological traits contributing to drought stress tolerance in soybean

Giordani¹,

Gonçalves²,

Moraes³

et al. 2019

Aust J Crop Sci

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Abiotic stresses, especially drought, may seriously affect soybean yield. Due to the complexity of drought tolerance, one of the difficulties in selecting genotypes is the identification of traits contributing to improve stress tolerance. This study carried out soybean phenotyping under water deficit in vegetative and reproductive stages in field conditions at two consecutive crop seasons (2012/13 and 2013/14). The experiment was performed in Londrina, PR, Brazil, with two soybean cultivars with distinct levels of drought tolerance, BR 16 (sensitive) and Embrapa 48 (less sensitive). Water deficit was applied through rainout shelters, moving on rails to cover plots when the rainfall begins and uncover them when it ends. Then, some agronomic and morphological traits were measured. Multivariate statistics through the principal component analysis (PCA) associated with the biplot graph identified traits contributing to greater yield stability under drought. Result showed that water deficit affected soybean yield, mainly in the reproductive stage, in which Embrapa 48 had greater yield stability when compared to BR 16. However, opposite results were obtained for stress induced in the vegetative stage, when Embrapa 48 was more negatively affected than BR16 cultivar. Seed weight influenced yield differences between cultivars. Lighter seeds, but in larger number, constituted an advantage under water deficit. Due to the difficulty in introducing all drought tolerance mechanisms in one genotype, breeding programs need to define selection parameters according to regional drought conditions.

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Section: Discussionmentioning

confidence: 93%

Identification of agronomical and morphological traits contributing to drought stress tolerance in soybean

Giordani¹,

Gonçalves²,

Moraes³

et al. 2019

Aust J Crop Sci

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“…The averages obtained for these variables were 11.23 cm and 0.89 g, respectively, and these averages were lower than those obtained in different studies with upland rice, cv. Spring (Cancellier et al, 2011;Terra et al, 2015).…”

Section: Resultsmentioning

confidence: 99%

“…Water stress due to lack of water affects the vegetative development of upland rice plants (Terra et al, 2015). The partial suppression of water supply to plants can trigger a series of morphological and physiological changes.…”

Section: Resultsmentioning

confidence: 99%

“…Soil water deficiencies also compromise the vegetative and reproductive development of rice plants (Terra et al, 2015). Damage associated with soil water deficits is caused by the onset of a series of morphological and physiological changes, such as a decrease in the relative intracellular water content, leading to lower photosynthetic capacity and gas exchange reductions and culminating in lower amounts of energetic reserves used for the formation of tissues in different developmental stages (Awasthi et al, 2014;Zhou et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

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Different soaking times and niacin concentrations affect yield of upland rice under water deficit conditions

et al. 2019

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Rice is an important source of energy for a large part of the world’s population. The development and application of technologies that contribute to the improvement of production forthis grain have great importance. The objective of this study was to evaluate the influence of rice seed immersion in a niacin solution on plant development, physiology and production. Thetreatments were defined by a combination of two immersion times for the seeds (12 h and 24 h) in four niacin concentrations (0.00, 100, 200 and 300 mg L-1) distributed in five replicates. Characteristics relating to seedling emergence, plant vegetativedevelopment, relative indices of chlorophyll and grain yield were evaluated. We verified that the immersion of the seeds for 12 h gave higher relative indices of chlorophyll, whereas immersion for 24 h increased the speed of emergence and the number of tillers and panicles. The doses of niacin positively affected the relative chlorophyll indices and the production characteristics, up to a maximum concentration of 172.57 mg L-1. We concluded that the immersion of rice seeds for 24 h increased the speed of seedling emergence, leaf number, and panicles per area. However, the relative indices of chlorophyll in leaves decreased. The use of niacin promoted the numbers of spikelets per panicle, fertility of the spikelets and the weight of 1000 grains, besides increasing the relative index of chlorophyll in the leaves of rice plants.

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“…O arroz de terras altas, comumente utilizado no ecossistema do cerrado, onde há possível ocorrência de verânicos, ou seja, ausência temporária de chuva durante a estação chuvosa, a cultura está sujeita a redução da produtitivade (Mendes et al, 2014;Terra et al, 2015).…”

Section: Introductionunclassified

Características agronômicas de arroz de terras altas cultivado na Amazônia Ocidental

Jordão¹,

Radmann²,

Campos³

et al. 2017

Rev. Ciênc. Agrár.

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PALAVRAS-CHAVE Cultivar Oryza sativa Campo natural Produtividade KEYWORDS Grow cropsOryza sativa Natural field Productivity RESUMO: A produção de grãos no estado do Amazonas ainda é incipiente para atender a demanda local por estes alimentos. Nesse contexto, foi realizado um experimento no município de Humaitá-AM com o objetivo de avaliar o desempenho agronômico de cultivares de arroz de terras altas. O trabalho foi conduzido em área de campo natural e o delineamento experimental foi em blocos ao acaso, com 12 tratamentos (cultivares de arroz) e 4 repetições. A semeadura foi realizada manualmente em 22/11/2011 no espaçamento de 0,20 m entre linhas e densidade de 60 sementes por metro. Foram realizadas 2 adubações de cobertura, a primeira na fase de perfilhamento e a segunda na fase de diferenciação do primórdio floral. A colheita foi realizada manualmente quando os grãos apresentaram em torno de 22% de umidade. Os cultivares apresentaram redução no número de dias para atingir floração média e ciclo, o cultivar BRS Tropical apresentou menor altura, os cultivares BRS Apinajé, BRS Primavera e BRSMG Curinga obtiveram maior altura de planta. A maior produtividade e rendimento de grãos foram observados no cultivar BRSGO Serra Dourada, juntamente com os cultivares BRS Sertaneja, BRS pepita e BRS Tropical. Os cultivares BRSGO Serra Dourada, BRS Sertaneja, BRS Pepita e BRS Tropical podem ser considerados promissores para região, devido ao bom desempenho produtivo nas condições de cultivo. A análise multivariada mostrou de forma excelente as correlações existentes entre as variáveis. ABSTRACT: Grain production in the state of Amazonas is still incipient to meet local demand for these foods. In this context, an experiment was carried out in the municipality

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Características de tolerância à seca em genótipos de uma coleção nuclear de arroz de terras altas

Cited by 13 publications

References 15 publications

Identification of agronomical and morphological traits contributing to drought stress tolerance in soybean

Identification of agronomical and morphological traits contributing to drought stress tolerance in soybean

Different soaking times and niacin concentrations affect yield of upland rice under water deficit conditions

Características agronômicas de arroz de terras altas cultivado na Amazônia Ocidental

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