Análise de crescimento e partição de assimilados em plantas de maria-pretinha submetidas a níveis de sombreamento

Aumonde, Tiago Zanatta; Pedó, Tiago; Martinazzo, Emanuela Garbin; Moraes, Dário Munt de; Villela, Francisco Amaral; Lopes, Nei Fernandes

doi:10.1590/s0100-83582013000100011

Cited by 18 publications

(22 citation statements)

References 11 publications

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“…2A). With the emergence of spikes at 84 DAE, there was a modification of the preferential metabolic drain in which these units containing seeds began to act as a strong (Aumonde et al 2013).…”

Section: Resultsmentioning

confidence: 99%

“…Thus, a growth analysis is a fairly inexpensive and accurate method to evaluate plant growth under different management and environmental conditions (Aumonde et al 2013). This analysis allows for the inference of the contribution by different physiological processes of growth to plant performance and is the first step in the interpretation and analysis of primary production (Pedó et al 2013b).…”

Section: Introductionmentioning

confidence: 99%

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Plant growth analysis and seed vigor expression: effects of soil waterlogging during rye plant development

et al. 2015

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This study aimed to evaluate the growth, assimilate partitioning and seed vigor expression of rye seeds subjected to waterlogging during development. The experimental design was completely randomized with six replications and three treatments. The treatments involved different waterlogging periods: a) no waterlogging; b) single waterlogging of three days; and c) two soil waterlogging periods of three days. The plants were collected at regular intervals of 14 days after emergence until the end of the growth cycle, measuring the dry matter accumulation and the leaf area for growth analysis and dry matter partition between the organs and number of flowers. The other calculated indices included the harvest index and relative seedling emergence rate originating from the seeds of plants that were maintained at field capacity and under the effect of soil waterlogging. Rye plants that were not subjected to waterlogging had a higher dry matter, dry matter production rates and harvest index compared to the plants under the effect of two soil waterlogging periods. Plants under the effect of two waterlogging periods showed drastic alterations in their growth rates and assimilate partitioning during development, and seed vigor expression was negatively affected when the plants were subjected to soil waterlogging.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Plant growth analysis and seed vigor expression: effects of soil waterlogging during rye plant development

et al. 2015

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“…Razão de área foliar: estimada a partir de quatro subamostras de 10 plântulas coletadas ao final do teste de emergência, por meio da equação F a =A f /W t , em que A f corresponde à área foliar e W t indica matéria seca total da plântula, similarmente às recomendações de Radford (Aumonde et al, 2013).…”

Section: Methodsunclassified

Vigor de sementes e desempenho inicial de plântulas de feijoeiro em diferentes profundidades de semeadura

Pedó

Segalin

Silva

et al. 2014

Agraria

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RESUMOA profundidade de semeadura pode interferir na emergência das plântulas e no seu estabelecimento inicial. Este trabalho objetivou avaliar a influência da profundidade de semeadura sobre a expressão do vigor de sementes e o desempenho inicial de plântulas de feijoeiro. Utilizaram-se sementes das cultivares IPR-Gralha e IPR-Tiziu e os tratamentos consistiram em diferentes profundidades de semeadura, 15; 30; 45 e 60 mm. Foram avaliados emergência, comprimento e matéria seca de raízes e parte aérea, área foliar, razão de parte aérea, raiz e área foliar. A emergência e a matéria seca das plântulas reduziram com a profundidade de semeadura. A razão de área foliar aumentou na cultivar IPR-Tiziu até a profundidade de 30 mm e na cultivar IPR-Gralha foi crescente com o aumento da profundidade de semeadura. O aumento na profundidade de semeadura reduz a expressão do vigor e o desempenho inicial de plântulas de feijoeiro.Palavras-chave: estande de plantas, performance de plântulas, Phaseolus vulgaris L., qualidade fisiológica Seed vigor and initial performance of bean seedlings under different sowing depths ABSTRACTThe sowing depth can influence the seedling emergence and its initial establishment. The aim of this study was to evaluate the influence of sowing depth on the expression of vigor and initial performance of bean seedlings. The cultivars used were IPRGralha and IPR-Tiziu and the treatments consisted of different sowing depths 15, 30, 45 and 60 mm. The parameters evaluated were emergence, seedling length (root and shoot), seedling dry weight (root and shoot), leaf area, shoot/root ratio and leaf area ratio. The emergence and seedling dry weight were reduced with the sowing depth. The leaf area ratio increased in the cultivar IPR-Tiziu until depth of 30 mm and in the cultivar IPR-Gralha increased with the depth of sowing. Increased sowing depth decreased the vigor expression and initial performance of bean seedlings.

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“…By photosynthesis, plants absorb the active solar radiation and incorporate atmospheric CO 2 into carbon compounds intended for plant growth. Thus, factors such as the reduction of solar radiation on the leaves decrease the amount of radiation absorbed by the photosynthetic apparatus, which reduces the conversion of light energy into chemical energy, affecting the growth and development of the plants ( Aumonde at al., 2013).…”

Section: Introductionmentioning

confidence: 99%

Growth and physiological characteristics of the weed false johnsongrass ( Sorghum arundinaceum (Desv.) Stapf)

et al. 2016

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RESUMOSubmitted on 03/27/2014 and approved on 10/20/2015 Sorghum arundinaceum (Desv.) Stapf a weed that belongs to the Poaceae family and is widespread throughout Brazil. Despite the frequent occurrence, infesting cultivated areas, there is little research concerning the biology and physiology of this species. The objective of this research was to evaluate the growth, carbon partitioning and physiological characteristics of the weed Sorghum arundinaceum in greenhouse. Plants were collected at regular intervals of seven days, from 22 to 113 days after transplanting (DAT). In each sample, we determined plant height, root volume, leaf area and dry matter, and subsequently we performed the growth analysis. We have determined the dry matter partitioning among organs, the accumulation of dry matter, the specific leaf area, the relative growth rate and leaf weight ratio. At 36, 78 and 113 DAT, the photosynthetic and transpiration rates, stomatal conductance, CO 2 concentration and chlorophyll fluorescence were evaluated. The Sorghum arundinaceum reached 1.91 m in height, with slow initial growth and allocated much of the biomass in the roots. The photosynthetic rate and the maximum quantum yield of FSII are similar throughout the growth cycle. At maturity the Sorghum arundinaceum presents higher values of transpiration rate, stomatal conductance and non-photochemical quenching coefficient (NPQ).Key words: growth analysis, gas exchange, chlorophyll a fluorescence. Crescimento e características fisiológicas da planta daninha falso-massambará (Sorghum arundinaceum (Desv.) Stapf) Sorghum arundinaceum (Desv.) Stapf é uma planta daninha pertencente à família Poaceae e encontra-se disseminada em todo o território brasileiro. Apesar da ocorrência frequente, infestando áreas cultivadas, são poucas as pesquisas concernentes à biologia e à fisiologia desta espécie. Objetivou-se com esta pesquisa avaliar o crescimento, a partição de fotoassimilados e as características fisiológicas da planta daninha Sorghum arundinaceum, em casa de vegetação. As plantas foram coletadas em intervalos regulares de sete dias, a partir de 22 e até 113 dias após o transplantio (DAT). Em cada coleta, determinaram-se altura de plantas, volume de raiz, área foliar e massa seca e, posteriormente, aplicou-se a análise de crescimento, sendo calculada a partição de massa seca entre os órgãos, o acúmulo de massa seca, a área foliar específica, a taxa de crescimento relativo e a razão de peso foliar. Aos 36, 78 e 113 DAT foram avaliadas as taxas fotossintética e transpiratória, a condutância estomática, a relação entre a concentração 17 Growth and physiological characteristics of the weed false johnsongrass (Sorghum arundinaceum... Deborah Amorim Martins

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Análise de crescimento e partição de assimilados em plantas de maria-pretinha submetidas a níveis de sombreamento

Cited by 18 publications

References 11 publications

Plant growth analysis and seed vigor expression: effects of soil waterlogging during rye plant development

Plant growth analysis and seed vigor expression: effects of soil waterlogging during rye plant development

Vigor de sementes e desempenho inicial de plântulas de feijoeiro em diferentes profundidades de semeadura

Growth and physiological characteristics of the weed false johnsongrass ( Sorghum arundinaceum (Desv.) Stapf)

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