Germinação E Vigor De Sementes De Crambe Sob Estresse Hídrico

Teixeira, Renake Nogueira; Toledo, Mariana Zampar; Ferreira, Gisela; Cavariani, Cláudio; Jasper, Samir Paulo

doi:10.15809/irriga.2011v16n1p42

Cited by 12 publications

(11 citation statements)

References 8 publications

(5 reference statements)

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“…These results corroborate those found by Teixeira et al (2011), who observed that the reduction in the osmotic potential of the soaking solution caused decreases in the germination of crambe seeds. Medeiros et al (2015) also observed significant reduction in the germination of sesame seeds from the water potential of -0.2 MPa on, reaching null values at the osmotic potential of -1.0 MPa.…”

Section: Resultssupporting

confidence: 92%

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Physiological quality of seed and seedling performance of crambe genotypes under water stress

Machado

David

Cangussú

et al. 2017

Rev. bras. eng. agríc. ambient.

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A B S T R A C TWater stress is a condition that causes physiological changes in different species and even genotypes of the same species. One of the osmotic agents most used to simulate this condition is polyethylene glycol 6000. The aim of this study was to evaluate the effects of water stress on the physiological quality of seeds and performance of seedlings of crambe genotypes. A completely randomized design was used, in a factorial scheme with two genotypes (one cultivar and one line) and five osmotic potentials simulated with aqueous solutions of polyethylene glycol 6000 (control = 0, -0.25, -0.50, -1.0, -1.50 MPa), with four replicates of 50 seeds per treatment. The effects of the treatments were evaluated by means of germination, first count, germination speed index and fresh and dry matter of seedlings. The physiological quality of seeds and the performance of crambe seedlings are negatively affected under water stress from -0.25 MPa on. Seeds of the genotype FMSCR 1101 have greater tolerance to drought stress, regardless of the osmotic potential used.Qualidade fisiológica de sementes e desempenho de plântulas de genótipos de crambe sob estresse hídrico R E S U M O O estresse hídrico é uma condição que provoca alterações fisiológicas em diversas espécies e até mesmo em genótipos de uma mesma espécie. Um dos agentes osmóticos mais utilizados para simular esta condição é o polietilenoglicol 6000. Objetivou-se, com este trabalho avaliar os efeitos do estresse hídrico na qualidade fisiológica de sementes e no desempenho de plântulas de genótipos de crambe. Utilizou-se o delineamento experimental inteiramente casualizado em esquema fatorial com dois genótipos (uma cultivar e uma linhagem) e cinco potenciais osmóticos simulados com soluções aquosas de polietilenoglicol 6000 (testemunha = 0; -0,25; -0,50; -1,0; -1,50 MPa), em quatro repetições de 50 sementes por tratamento. Os efeitos dos tratamentos foram avaliados por meio dos testes de germinação, primeira contagem de germinação, índice de velocidade de germinação, matéria fresca e matéria seca de plântulas. A qualidade fisiológica das sementes e o desempenho das plântulas de crambe são afetados negativamente sob estresse hídrico a partir de -0,25 MPa. Sementes do genótipo FMSCR 1101 apresentam maior tolerância ao estresse hídrico, independente do potencial osmótico utilizado.

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Section: Resultssupporting

confidence: 92%

“…Teixeira et al (2011) also found values close to zero in the germination of crambe seeds at osmotic potentials lower than -1.0 MPa induced by PEG 6000. For canola, Santos et al (2012) observed that the reduction of water availability in the substrate from -0.3 MPa on significantly reduced seed germination.…”

Section: Resultsmentioning

confidence: 59%

Physiological quality of seed and seedling performance of crambe genotypes under water stress

Machado

David

Cangussú

et al. 2017

Rev. bras. eng. agríc. ambient.

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“…However, no records exist regarding the physiological performance of FMS CR1101 lineage under low water availability in Brazil. In general, studies with crambe are focused on seed storage, germination, and oil quality (Martins et al, 2011;Teixeira et al, 2011). The knowledge about the physiological performance of a specific genotype submitted to water stress give us the base to expand the culture to regions characterized by low precipitation.…”

Section: Introductionmentioning

confidence: 99%

Physiological responses to intense water deficit in two genotypes of crambe (Crambe abyssinica Hochst.)

Martins¹,

Souza²,

Pitol³

et al. 2017

Aust J Crop Sci

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Drought stress is a major environmental factor limiting growth and agricultural productivity. The objective of this study was to compare photosynthetic responses to intense water deficit and the recovery capacity in crambe plants (Crambe abyssinica Hochst. cultivar FMS Brilhante and lineage FMS CR1101) using chlorophyll a fluorescence analyses. Plants were submitted to water deficit for seven days followed by rehydration. Chlorophyll a fluorescence measurements were performed using a Handy-PEA fluorometer. Under drought stress, there was a reduction of the leaf relative water content (RWC) and stomatal conductance (g s ), with full recovery after three days of rehydration to BRS Brilhante cultivar. Both genotypes showed decreased flux of electrons transport from the absorption to the reduction of the intersystem acceptors. FMS Brilhante cultivar showed better energetic connectivity (L-band) between photosystem II (PSII) units and lower inactivation of the oxygen-evolving complex (K-band), evidencing advantages of the cultivar compared to FMS CR1101 lineage. Finally, the recovery of photosynthetic activity observed in FMS CR1101 lineage during rehydration was due the phenomena related to the electron flow around the PSI. Keywords:Chlorophyll a fluorescence; Drought tolerance; JIP-test; Recovery; Photosystem II. Abbreviations: F 0 = F 20 µs , minimum fluorescence, when all PSII RCs are open; F2 (100 µs) and F3 (300 µs) , fluorescence intensity at 100 and 300 µs, respectively; F4 (2 ms) and F5 (30 ms), fluorescence intensity at the J-step (2 ms) and the I-step (30 ms), respectively; F m , maximum fluorescence, when all PSII RCs are closed; g s , stomatal conductance; RWC, relative leaf water content; DH, days after the onset of drought stress; RC, days after rehydration; P 680 , reaction center of photosystem II; PQH 2 , plastoquinol; CF, chlorophyll a fluorescence, OEC, oxygen-evolving complex; PSI, photosystem I; PSII, photosystem II; Q A , primary quinone acceptor of PSII; RC, reaction centre; ROS, reactive oxygen species; V t , variable fluorescence between steps O (20 µs) and P; V OK , variable fluorescence between steps O (20 µs) and K (300 µs); V OJ , variable fluorescence between steps O (20 µs) and J (2 ms); V IP , variable fluorescence between steps I (30 ms) and P; ΔV , diference kinetic; TM,turgid mass; DM, dry mass.

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“…Originário da região quente e seca da Etiópia foi domesticado na região fria e seca do Mediterrâneo encontrando-se relatos que atestam tolerância das plantas a períodos de estresse hídrico (Teixeira et al, 2011).…”

Section: Introductionunclassified

Armazenamento do crambe em diferentes embalagens e ambientes: Parte I - Qualidade fisiológica

Bessa¹,

Donadon²,

Resende³

et al. 2015

Rev. bras. eng. agríc. ambient.

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R E S U M OObjetivou-se, neste trabalho, avaliar a qualidade fisiológica das sementes de crambe em diferentes condições de armazenamento, durante nove meses. O crambe com teor de água de 4,63% base úmida foi acondicionado nas embalagens laminada, polietileno tereftalato (PET) e polietileno de alta densidade (PEAD), as quais foram armazenadas nos ambientes: refrigerado, a 10 ± 1,19 °C e 34,84 ± 4,09% UR e natural, a 24,81 ± 1,82 °C e 54,93 ± 12,77% UR. O delineamento utilizado foi o inteiramente casualizado em esquema fatorial triplo (3 x 2 x 4) com três repetições. Os dados foram analisados por meio de análise de variância e regressão. O ambiente natural e a embalagem PET são os que melhor se apresentam para manter a qualidade fisiológica das sementes de crambe por até seis meses de armazenamento. O ambiente natural preserva o vigor de sementes e promove superação da dormência primária logo no terceiro mês de armazenamento. O ambiente refrigerado a 10 °C não é recomendado para o armazenamento das sementes de crambe. Storage of crambe seeds in different containers and environments: Part I -Physiological quality A B S T R A C TThe present study aimed to evaluate the physiological quality of seeds of crambe in different storage conditions for nine months. The crambe with moisture content of 4.63% (wet basis) was placed in the packages laminated, PET and HDPE, which were stored in environments: refrigerated at 10 ± 1.19 °C and 34.84 ± 4.09% relative humidity (RH) and natural at 24.81 ± 1.82 °C and 54.93 ± 12.77% RH. The completely randomized design in triple factorial (3 x 2 x 4) with three replications was used. Data were analysed by analysis of variance and regression. The natural environment and packaging PET containers is best to maintain seed quality of crambe for up to six months of storage. The natural environment preserves the seed vigor and promotes overcome primary dormancy as early as the third month of storage. The refrigerated environment at 10 °C is not recommended for storage of seeds of crambe. Palavras-chave:Crambe abyssinica ambiente refrigerado ambiente natural

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Germinação E Vigor De Sementes De Crambe Sob Estresse Hídrico

Cited by 12 publications

References 8 publications

Physiological quality of seed and seedling performance of crambe genotypes under water stress

Physiological quality of seed and seedling performance of crambe genotypes under water stress

Physiological responses to intense water deficit in two genotypes of crambe (Crambe abyssinica Hochst.)

Armazenamento do crambe em diferentes embalagens e ambientes: Parte I - Qualidade fisiológica

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