Developmental anatomy of Cyperus laxus (non-Nranz) and Fimbristylis dichotoma (Kranz) (Cyperaceae, Poales) and tissue continuity

Martins, Shirley; Scatena, Vera Lúcia

doi:10.1590/s0001-37652013005000032

Cited by 5 publications

(6 citation statements)

References 35 publications

(39 reference statements)

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“…The immersion of seeds in water at environmental or warmed temperature breaks seed dormancy due to the removal of soluble inhibitors found in the seed or fruit coat (BRASIL, 2009;LACERDA et al, 2010). In Nature, this is verified to occur due to the action of rains or in flooded areas (MARCOS FILHO, 2005), such as is the case of tall fringe-rush, a species which is found in irrigated rice areas or cultivated plains and drainage channels (BARROS, 2009;SCATENA, 2013).…”

Section: Resultsmentioning

confidence: 99%

“…It is found infesting lawns, pastures, irrigated rice fields, cultivated plains, drainage channels, alongside roads, and in coastal plains where it flowers almost the whole year. It propagates by means of rhizomes and seeds (BARROS, 2009;ALBUQUERQUE et al, 2012;SCATENA, 2013).…”

Section: Introductionmentioning

confidence: 99%

“…The dispersion structure used as a seed in the asexual propagation of the species are fruits of the achene type which present in their interior a differentiated embryo with coleoptiles turned to the micropyle and the radicle laterally positioned. Germination starts to occur visibly between one and three days after sowing over wet paper, kept at 30 °C and it is characterized by the emergence of the coleoptile followed by the primary root SCATENA, 2013).…”

Section: Introductionmentioning

confidence: 99%

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Effects of substratum, temperature, and treatments to overcome dormancy on the germination of Fimbristylis dichotoma seeds

Martins¹,

Bombonato²,

Marcussi³

et al. 2013

RCA

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Tall fringe-rush (Fimbristylis dichotoma) is a common weed in wetlands. Knowledge of the physiology of its seed germination can significantly contribute to the development of management strategies. The objective of this study was to determine the best combination of temperature, substratum, and treatments leading to seed dormancy suppression thus enhancing seed germination. In a first phase, seeds were put to germinate under constant temperatures ranging from 15 to 40 °C at 5 °C intervals and alternating temperatures of 15-25, 15-35, and 20-30 °C (8 h of light). The effects were evaluated by means of a germination test carried out in filter paper. In another experiment, the seeds were submitted to the following treatments: 1. seeds immersion in H 2 SO 4 for 3 min, 2. seeds immersed in H 2 O for 15 min, 3. seeds immersed in a 1% KNO 3 solution for 15 min, 4. seeds dried at 50 °C for 12 h, and 5. non treated ( check treatment) seeds. The effects in the second experiment were evaluated by means of a germination test carried out in the following substrata: 1. a ready-made substratum (bioplant prata™), 2. soil, and 3. sand. In both experiments, the evaluations were the following: total germination, germination first count (three days), speed of germination index, and mean time for seed germination. The experimental units were distributed in the germination chamber according to a completely random design with four repetitions. The results showed that the best germination result (94%) was attained when the tall fringe-rush seeds were dried for 12 h at 50 °C and put to germinate under either ready-made or soil substrata and under alternate temperatures of either 15-25 or 15-35 °C.RESUMO: O falso-alecrim-da-praia (Fimbristylis dichotoma) é uma planta daninha comum em áreas úmidas. O conhecimento da ecofisiologia da germinação dessa espécie pode contribuir significativamente para o desenvolvimento de estratégias de manejo. O objetivo deste trabalho foi identificar condições de temperatura, substrato e tratamentos de superação de dormência que favorecem a germinação de sementes dessa espécie. Numa primeira etapa da pesquisa, foi avaliada a germinação das sementes sob temperaturas constantes de 15 a 40 °C, com intervalos de 5 °C, e temperaturas alternadas de 15-25, 15-35 e 20-30 °C (8 h de luz). Numa segunda etapa, foram avaliados os tratamentos de imersão das sementes em H 2 SO 4 por 3 min; H 2 O por 15 min; KNO 3 (1%) por 15 min; secagem a 50°C por 12 h, e sementes sem tratamento (testemunha), avaliadas quanto à germinação em substrato industrializado para mudas, terra e areia. Determinaram-se a germinação; a primeira contagem de germinação (sete dias); o índice de velocidade de germinação, e o tempo médio de germinação até 40 dias, avaliado em um delineamento inteiramente casualizado com quatro repetições de 200 sementes. Concluiu-se que a germinação de sementes de falso-alecrim-da-praia deve ser realizada nas temperaturas alternadas de 15-25 e 15-35 °C, em substrato industrializado para mudas ou terra, e após secagem da...

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effects of substratum, temperature, and treatments to overcome dormancy on the germination of Fimbristylis dichotoma seeds

Martins¹,

Bombonato²,

Marcussi³

et al. 2013

RCA

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“…Amini Rad & Sonboli (2008) studied 10 Iranian species of Cyperus using light microscopy. Anatomical features of some species of Cyperaceae from northeastern Brazil have also been carried out (Martins, Alves, 2009;Martins, Scatena, 2013). The aim of the present study was to examine anatomical evidence in the species of Cyperus distributed in northern Iran, in order to provide additional information for the taxonomic delimitation at genus level.…”

Section: Introductionmentioning

confidence: 99%

Anatomical study on some species of genus Cyperus in northern Iran

Mehrvarz¹,

Moharami²

2016

Ukr.Bot.J.

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Comparative anatomy of six taxa of Cyperus distributed in the north of Iran was studied. The investigated species are: C. difformis, C. distachyos, C. fuscus, C. pygmaeus, C. odoratus subsp. transcaucasicus, and C. rotundus. Cross sections of stems and leaves of these species were examined. The following characters were determined to be taxonomically informative: cross-section shape of the aerial stem, presence or absence of vascular bundle in the central part of stem cross-sections, the diameter of mesophyll and air cavities in stem and leaf cross-sections. Cyperus fuscus and C. difformis differ from other studied species in having large air cavities in stem and leaf cross section. Our results show that comparative anatomy of lateral stems and leaves may provide additional characters to be considered in taxonomic studies within this genus.

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“…Cyperus laxus L. is a member of the Cyperaceae family, which is considered to be a weed cosmopolitan weed located in tropical and subtropical regions [ 10 , 11 ]. It was also recently reported that this and other Cyperaceae species have been identified as pioneer plants in tropical aged and long-term oil spill-impacted sites [ 12 , 13 ].…”

Section: Introductionmentioning

confidence: 99%

The Fatty Acid Profile Analysis of Cyperus laxus Used for Phytoremediation of Soils from Aged Oil Spill-Impacted Sites Revealed That This Is a C18:3 Plant Species

et al. 2015

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The effect of recalcitrant hydrocarbons on the fatty acid profile from leaf, basal corm, and roots of Cyperus laxus plants cultivated in greenhouse phytoremediation systems of soils from aged oil spill-impacted sites containing from 16 to 340 g/Kg total hydrocarbons (THC) was assessed to investigate if this is a C18:3 species and if the hydrocarbon removal during the phytoremediation process has a relationship with the fatty acid profile of this plant. The fatty acid profile was specific to each vegetative organ and was strongly affected by the hydrocarbons level in the impacted sites. Leaf extracts of plants from uncontaminated soil produced palmitic acid (C16), octadecanoic acid (C18:0), unsaturated oleic acids (C18:1-C18:3), and unsaturated eichosanoic (C20:2-C20:3) acids with a noticeable absence of the unsaturated hexadecatrienoic acid (C16:3); this finding demonstrates, for the first time, that C. laxus is a C18:3 plant. In plants from the phytoremediation systems, the total fatty acid contents in the leaf and the corm were negatively affected by the hydrocarbons presence; however, the effect was positive in root. Interestingly, under contaminated conditions, unusual fatty acids such as odd numbered carbons (C15, C17, C21, and C23) and uncommon unsaturated chains (C20:3n6 and C20:4) were produced together with a remarkable quantity of C22:2 and C24:0 chains in the corm and the leaf. These results demonstrate that weathered hydrocarbons may drastically affect the lipidic composition of C. laxus at the fatty acid level, suggesting that this species adjusts the cover lipid composition in its vegetative organs, mainly in roots, in response to the weathered hydrocarbon presence and uptake during the phytoremediation process.

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Developmental anatomy of Cyperus laxus (non-Nranz) and Fimbristylis dichotoma (Kranz) (Cyperaceae, Poales) and tissue continuity

Cited by 5 publications

References 35 publications

Effects of substratum, temperature, and treatments to overcome dormancy on the germination of Fimbristylis dichotoma seeds

Effects of substratum, temperature, and treatments to overcome dormancy on the germination of Fimbristylis dichotoma seeds

Anatomical study on some species of genus Cyperus in northern Iran

The Fatty Acid Profile Analysis of Cyperus laxus Used for Phytoremediation of Soils from Aged Oil Spill-Impacted Sites Revealed That This Is a C18:3 Plant Species

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