Soil flood tolerance of seven genotypes of Panicum maximum Jacq.

Silva, Adriane Schio; Laura, Valdemir Antônio; Jank, Liana

doi:10.1590/s1516-89132009000600004

Cited by 5 publications

(4 citation statements)

References 15 publications

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“…Marandu com baixa tolerância ao alagamento e de Mattos et al (2005) que verificam que a taxa de crescimento das folhas em B. brizantha, cv. Marundu foi maior em déficit hídrico do que sob alagamento; entretanto, a mesma cultivar pode ter genótipos diferentes ocorrendo variação intraespecífica na tolerância ao estresse hídrico (Silva et al, 2009) uma vez que plantas mais adaptadas às condições adversas modificam a maioria de suas funções fisiológicas para manter suas atividades vitais, o que pode ter ocorrido com a cultivar utilizada.…”

Section: Resultsunclassified

Cultivares de Brachiaria brizantha sob diferentes disponibilidades hídricas em Neossolo Flúvico

Kroth

Bonfim-Silva

Silva

et al. 2015

Rev. bras. eng. agríc. ambient.

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R E S U M OPropôs-se, com este trabalho, estabelecer a tolerância ao déficit hídrico e ao alagamento do solo na produção de folhas e colmos de três cultivares de Brachiaria brizantha cultivadas em Neossolo Flúvico. O experimento foi realizado em casa de vegetação cujas unidades experimentais foram vasos plásticos com capacidade de solo de 4,2 dm³. O delineamento experimental foi inteiramente casualizado em esquema fatorial 3 x 3, com três cultivares de Brachiaria brizantha (Marandu, Piatã e Xaraés) e três disponibilidades hídricas, sendo solo alagado (0 kPa), capacidade de campo (10 kPa, tratamento controle) e déficit hídrico (50 kPa), em 5 repetições. O solo utilizado foi o Neossolo Flúvico. Para avaliação foram realizados três cortes nos quais foram avaliadas massa seca de folhas, massa seca de colmos e relação folha/colmo. Os dados foram submetidos à análise de variância pelo teste F e, quando significativos, foi aplicado o teste de Tukey até 0,05 de probabilidade. As cultivares de Brachiaria brizantha (Marandu, Piatã e Xaraés) apresentaram susceptibilidade ao déficit hídrico em que a cultivar Marandu foi a única resistente ao alagamento do solo com desenvolvimento expressivo nos três cortes realizados. Brachiaria brizantha cultivars grown under different water availability in Entisol A B S T R A C TThe objective was to establish the tolerance to drought and flooding in the production of leaves and stems of three B. brizantha cultivars in Fluvisol. The experiment was conducted in a greenhouse, where the experimental units were plastic pots with capacity of 4.2 dm³. The experimental design was completely randomized in a factorial 3 x 3 with three cultivars of Brachiaria brizantha (Marandu, Piatã and Xaraés) and three water availability, and, waterlogged soil (0 kPa), field capacity (10 kPa, control) and water deficit (50 kPa) with 5 repetitions. The soil used was Entisol. Three cuttings were performed which were evaluated for dry mass of leaves, dry mass of stems and leaf/stem ratio. Data were subjected to analysis of variance by F test, and when significant Tukey test at 0.05 probability was used. The cultivars of Brachiaria brizantha (Marandu, Piata and Xaraés) were susceptible to drought, being the Marandu the only resistant to flooding, with significant development in the three cuttings.

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Section: Resultsunclassified

Cultivares de Brachiaria brizantha sob diferentes disponibilidades hídricas em Neossolo Flúvico

Kroth

Bonfim-Silva

Silva

et al. 2015

Rev. bras. eng. agríc. ambient.

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“…There were genotype (P = 0.0001) and month (P = 0.0001) effects on leaf PR. Highest rates were measured in 'Tobiatã' (33.5 lmol CO 2 m À2 s À1 ) and 'Massai' registered the lowest rates (20.3 lmol CO 2 m À2 s À1 ), which may be likely associated with its morphology, low nutritional/fertility requirements and low relative growth rates (Silva et al 2009a), contrasting with the other Panicum genotypes. Among 'Tanzânia,' 'Mombac ßa' and 'Atlas' there were no differences in leaf photosynthesis (mean = 26.5 lmol CO 2 m À2 s À1 ), and this is consistent with their similar overall requirements in terms of physiology, morphology and agronomic characteristics.…”

Section: Leaf Photosynthetic Response To Irradiance Levelmentioning

confidence: 83%

Leaf age, leaf blade portion and light intensity as determinants of leaf photosynthesis in Panicum maximum Jacq.

Pedreira

Lara

2015

Grassland Science

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The objective in this research was to identify photosynthetic responses of three leaf age groups measured in three portions of the leaf blade of two morphologically contrasting genotypes of Panicum maximum. Photosynthetic rate (PR) varied across leaf age groups and among leaf portions. Highest PR (20.6 lmol CO 2 m À2 s À1 ) was recorded on the youngest fully expanded leaf, followed by the oldest green leaf and the expanding leaf. The middle and apical portions of the leaf had, on average, the highest PR (24.2 and 26.3 lmol CO 2 m À2 s À1 , respectively). In both 'Massai' and 'Tobiatã' cultivars the photosynthetic response was dependent upon leaf age groups and portions of the blade, with highest rates measured on the middle portion of the youngest fully expanded leaf. The P. maximum had similar parameters for the light response curve suggesting similar photosynthetic light response to light intensity across genotypes.

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“…Presented lower relative growth rates (Silva et al, 2009). Leaf area index (LAI) presented high coefficient of determination (R 2 ≥ 0.97) and, at 63 and 70 DAS, the maximum value was reached in plants maintained at soil field capacity and under the effect of 8 h of soil waterlogging, respectively (Figure 1d).…”

Section: Resultsmentioning

confidence: 99%

“…Nevertheless, the absence of oxygen required to reduce sugars by the glycolytic pathway, may have been a limiting factor for survival when periods of 16 and 24 h of waterlogging were used (Parent et al, 2008a). The increase in the period of soil waterlogging tends to reduce dry matter accumulation of shoot and roots in plants of the Poaceae family, and the magnitude of the reduction is dependent of the genotype (Silva et al, 2009). Cultivation conditions under high air temperatures reduce the number of pods per plant, seeds per pod and seed mass, which negatively affects the yield (Aidar et al, 2002).…”

Section: Resultsmentioning

confidence: 99%

Soil waterlogging during late season: Growth, assimilate partitioning and vigor of bean seeds

PedÃ¹,

Aisenberg²,

Martinazzo³

et al. 2016

Afr. J. Agric. Res.

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Late season crops in planossoil are prone to waterlogging associated with high temperatures that are characteristic of the season, during brief periods of time in early summer. The aim of the present study was to evaluate growth, assimilate partitioning and seed vigor of bean plants subjected to periods of waterlogging and high temperatures during late season. Bean plants of the IPR Tuiuiú genotype were submitted to conditions of soil field capacity and to waterlogging for 8, 16 and 24 h. In order to obtain growth data, plants were collected in regular intervals of seven days until the end of the crop cycle, starting after sowing, dry matter content and leaf area were determined and used to estimate dry matter production, relative growth and net assimilation rates, leaf area index, solar energy conversion efficiency and organs' dry matter partitioning. Seeds were collected at the end of the developmental cycle and used for seedling emergence test and evaluation of initial growth. The level of stress imposed by waterlogging and high temperatures is time dependent, paralyzing dry matter allocation in bean plants and reducing the conversion efficiency of solar energy. Seeds produced by plants under this stress present low vigor and reduced initial growth.

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Soil flood tolerance of seven genotypes of Panicum maximum Jacq.

Abstract: The soil flood tolerance of seven genotypes of Panicum maximum Jacq. (PM11, PM34, PM40 and PM45, and the commercial cultivars Massai, Mombaça and Tanzânia)

Cited by 5 publications

References 15 publications

Cultivares de Brachiaria brizantha sob diferentes disponibilidades hídricas em Neossolo Flúvico

Cultivares de Brachiaria brizantha sob diferentes disponibilidades hídricas em Neossolo Flúvico

Leaf age, leaf blade portion and light intensity as determinants of leaf photosynthesis in Panicum maximum Jacq.

Soil waterlogging during late season: Growth, assimilate partitioning and vigor of bean seeds

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