Tolerância de linhagens de arroz de terras altas à seca

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

doi:10.1590/s1983-40632013000200013

Cited by 14 publications

(14 citation statements)

References 17 publications

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“…Crusciol et al (2003b) and Arf et al (2001) have reported that upland rice crop tends to show an increase in the number of days to 50% flowering under conditions of reduced water availability. Heinemann and Stone (2009) and Terra et al (2013) also found an increase in the number of days to flowering in upland rice cultivars subjected to water stress. Table 4.…”

Section: Resultsmentioning

confidence: 93%

“…According to Taiz and Zeiger (2013), reduced plant height is associated with reduced photosynthetic rate, reduced cell growth, and several morphological, physiological, and biochemical changes, leading to negative effects on biomass production as the plants do not obtain an adequate supply of water for development; this may explain the lower plant heights in the other cropping years. According to Crusciol et al (2003b), Terra et al (2013), andNunes et al (2012), drought stress changes the physiology of plants and reduces their heights, and depending on the intensity of the occurrence of stress in combination with other factors, the impact can be greater or lesser on the culture and final yield.…”

Section: Resultsmentioning

confidence: 99%

“…The region is also characterized by high seasonality of hydric precipitation, the so-called dry spells (veranicos) that cause large losses in production, since crops under water deficiency conditions undergo physiological, biochemical, and morphological alterations (TERRA et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

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Agronomic performance of upland rice cultivars in the southern region of the state of Tocantins

Tonello

Tavares

Rocha

et al. 2016

SCA

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Behavioural assessment of cultivars adapted to climate and soil variations is essential for recommending genetic materials to producers, achieving higher profitability, and, mainly, targeting regional growth. The aim of this study was to evaluate the agronomic performance of upland rice cultivars in different cropping periods and Cerrado vegetation soil in the southern region of the state of Tocantins. The experiments were conducted in a field at the Chaparral Farm and at the Experimental Station of the Federal University of Tocantins in the agricultural years of 2008/2009, 2009/2010, 2010/2011, 2011/2012, and 2012/2013 with cultivars BRS-Bonança, BRS-Primavera, and BRSMG-Conai. A randomized block experimental design was used with four replications in a factorial scheme of 3 × 5, comprising three genotypes and five years. The evaluated characteristics were as follows: number of days to flowering, plant height, weight of hundred grains, and grain yield. The highest upland rice yield was observed in the cropping period of 2012/13, which also had the highest volume and better distribution of rainfall; flowering time was lesser and greater for BRSMG-Conai and BRS-Bonança cultivars, respectively. The BRS-Primavera cultivar showed the highest grain yield in different years in Cerrado soil in the southern region of the state of Tocantins.

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Section: Resultsmentioning

confidence: 93%

Section: Resultsmentioning

confidence: 99%

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Agronomic performance of upland rice cultivars in the southern region of the state of Tocantins

Tonello

Tavares

Rocha

et al. 2016

SCA

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“…In the present study, the highest difference in plant height may be due to the restrictive conditions imposed by the volume of the pots, which intensified the effects of the treatments. Terra et al (2013) and Crusciol et al (2013) also showed that rice plants subjected to water stress along the cycle reduce their heights. With the increase in water tensions, there was water deficit in the soil, close to the roots; thus, the stomata close, in order to reduce vapor flow and transpiration.…”

Section: Resultsmentioning

confidence: 98%

Silicon fertilization and soil water tensions on rice development and yield

Oliveira

Koetz

Bonfim-Silva

et al. 2016

Rev. bras. eng. agríc. ambient.

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A B S T R A C TThe cultivation of upland rice (Oryza sativa) in Brazil occurs mainly in the Cerrado, a region with adverse weather conditions. The use of silicon in its cultivation becomes important, since this nutrient provides higher rigidity, lower transpiration and higher resistance to dry spells in rice plants. The objective of the present study was to evaluate the effect of silicon fertilization and soil water tensions on upland rice development and yield in a Cerrado Oxisol. A 5 x 5 fractionated factorial with five soil water tensions (0, 15, 30, 45 and 60 kPa) and five silicon doses (0, 120, 240, 480 and 960 mg dm -3 ) was used, which were distributed in a randomized block design, with four replicates. Plant height, number of tillers, number of panicles, number of grains per panicle, numbers of full and empty grains and percentage of empty grains were evaluated. Silicon fertilization promotes increased tillering in rice plants at the dose of 960 mg dm , respectively. The increase in soil water tensions reduced plant height and the number of full grains, and increased the percentage of empty grains of upland rice.Adubação silicatada e tensões de água no solo no desenvolvimento e rendimento do arroz R E S U M O O cultivo de arroz (Oryza sativa) de terras altas no Brasil ocorre principalmente em área de Cerrado, região que apresenta condições climáticas adversas. A utilização do silício em seu cultivo torna-se importante de vez que este nutriente proporciona maior rigidez, menor transpiração e maior resistência a veranicos em plantas de arroz. No presente estudo, objetivou-se avaliar o efeito da adubação silicatada e tensões de água do solo no desenvolvimento e rendimento de arroz de terras altas em Latossolo Vermelho do Cerrado. Utilizou-se esquema fatorial 5 x 5 fracionado com cinco manejos de irrigação baseados nas tensões de água no solo (0, 15, 30, 45 e 60 kPa) e cinco doses de silício (0, 120, 240, 480 e 960 mg dm -3 ) as quais foram distribuídas segundo delineamento de blocos ao acaso, com quatro repetições. Foram avaliados: altura de plantas, número de perfilhos, número de panículas, número de grãos por panícula, número de grãos cheios e chochos e porcentagem de grãos chochos. Adubação silicatada promove o aumento do perfilhamento em plantas de arroz com a dose de 960 mg dm . Ocorreu um decréscimo de produção de perfilhos e número de panículas com a aplicação de silício até as doses de 460 e 490 mg dm -3 , respectivamente. O aumento das tensões de água no solo reduziu a altura e o número de grãos cheios, e aumentou a porcentagem de grãos chochos de arroz de terras altas.

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“…These adversities result in low yields and unstable production over the years, leading to shortages, large price fluctuations and a drop in per capita consumption of this product, which represents one of the main Brazilian dishes (Morais et al, 2008). Around 13% of upland rice cultivation occurs without any type of irrigation and its productivity depends entirely on the water system of the growing region (Terra et al, 2013). Most of Brazil presents seasonal rainfall, often alternating with periods of water excess and deficiency, which can cause reduction in the production.…”

Section: Introductionmentioning

confidence: 99%

Phynotypic placticity of upland rice lines cultivated in Minas Gerais State, Brazil

Inácio¹,

Botelho²,

Moura³

et al. 2018

Aust J Crop Sci

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The evaluation of breeding lines for prior recommendation in different environments is a step that requires a high level of investment. This evaluation is extremely important, especially when the objective of breeding is to select lines with high homeostasis, adaptability associated with high yield, and stability. Thus, this paper aimed to study the phenotypic plasticity of thirteen upland rice lines for grain yield in multiple environments of Minas Gerais State, Brazil. The experiments were installed in nine different environments corresponding to the combination of locations and agricultural years. Thirteen elite lines were used, originating from a partnership between UFLA (Federal University of Lavras), Epamig (Agricultural Research Company of Minas Gerais) and Embrapa (Brazilian Company of Agricultural Research) Rice and Beans. The experiments were conducted in a complete randomized block design with three replicates. Culture treatments used for conducting were the same as those recommended for culture. The evaluated character was grain yield (kg.ha-1). Adaptability and stability were estimated by the methods Wricke, Annicchiarico, and Lin and Binns. All experiments showed average productivities above average in the state of Minas Gerais. The methods by Anniccchiarico and Lin Binns were efficient for the lines identification with phenotypic plasticity, emphasis on the lines CMG 2097, CMG 1896 and CMG 2089, which obtained superior average performance with productivities higher than 5 t.ha-1. Thus, these lines are promising for the Minas Gerais state recommendation, as well as in similar environments under low fertility natural soil, ferralsol (latosols), with tropical semi-humid and tropical altitude.

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Tolerância de linhagens de arroz de terras altas à seca

Cited by 14 publications

References 17 publications

Agronomic performance of upland rice cultivars in the southern region of the state of Tocantins

Agronomic performance of upland rice cultivars in the southern region of the state of Tocantins

Silicon fertilization and soil water tensions on rice development and yield

Phynotypic placticity of upland rice lines cultivated in Minas Gerais State, Brazil

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