Germination and emergence of Stachytarpheta cayennensis and Ipomoea asarifolia

Filho, M. B. Dias

doi:10.1590/s0100-83581996000200005

Cited by 27 publications

(8 citation statements)

References 4 publications

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“…As sementes de plantas daninhas que estão dormentes não são afetadas pela maioria dos métodos de controle, enquanto que, em processo de germinação, elas tornam-se muito vulneráveis (Dias Filho et al, 1996).…”

Section: Introductionunclassified

Superação de dormência e influência dos fatores ambientais na germinação de sementes de Spermacoce latifolia

Parreira

Cardozo

Giancotti

et al. 2011

Agraria

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RESUMOO conhecimento científico sobre a biologia de plantas daninhas contribui para a implantação de adequadas estratégias de manejo e controle. Este trabalho foi desenvolvido com o objetivo de avaliar a germinação de sementes de ervaquente (Spermacoce latifolia Aubl.), importante planta infestante em áreas de reflorestamento. As sementes foram submetidas à superação de dormência, em que foram avaliados a escarificação mecânica, tratamento químico (H 2 SO 4 e KNO 3 ) e térmico, além da testemunha. Foram avaliados ainda a temperatura (10, 15, 20, 25, 30 e 35°C), filtros de luz (ausência, vermelha, verde, amarela, vermelha distante, azul, laranja e transparente) e disponibilidade de água (0,0, -0,2, -0,4, -0,6, -0,8 e -1,0 MPa) na germinação e vigor das sementes. Os tratamentos foram arranjados em delineamento experimental inteiramente casualizado com quatro repetições, sendo a parcela experimental constituída por caixas plásticas tipo gerbox, com 50 sementes. A escarificação mecânica (lixa) foi o método que proporcionou melhor quebra de dormência, indicando que as sementes de S. latifolia possuem impermeabilidade do tegumento à água. As sementes apresentaram maiores percentagens de germinação em condições de leve restrição hídrica (-0,2 MPa) e a temperatura ótima foi de 25°C. A luz de cor azul reduziu a porcentagem de germinação. Palavras-chave:Escarificação, estresse hídrico, qualidade de luz, temperatura. Dormancy break and influence of environmental factors on the germination of Spermacoce latifolia seeds ABSTRACTUnderstanding basic information on weed biology contributes to the implementation of appropriate management and control strategies. Thus, this work was developed to evaluate the germination of Spermacoce latifolia Aubl. seeds, an important weed in reforestation areas. The seeds were subjected to dormancy break treatments, in which the mechanical scarification, chemical treatment (H2SO 4 and KNO 3 ), heat treatment, and control, were evaluated. Three more tests were done determinate the effects of temperature (10, 15, 20, 25, 30 and 35°C), light filters (absence of light and red, green, yellow, distant red, blue, orange and clear light) and water availability (0.0, -0.2, -0.4, -0.6, -0.8 and -1.0 MPa) on the seeds germination and vigor. The treatments were arranged in a completely randomized design with four replications, and the experimental plot was constituted by gerbox plastic boxes with 50 seeds. The mechanical scarification (sanding) provided the best dormancy break, indicating that Spermacoce latifolia seeds have tegument water impermeability. The seeds showed higher germination percentage under conditions of mild water stress (-0.2 MPa) and the optimal temperature was 25°C. The blue light reduced seed germination.

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Section: Introductionunclassified

Superação de dormência e influência dos fatores ambientais na germinação de sementes de Spermacoce latifolia

Parreira

Cardozo

Giancotti

et al. 2011

Agraria

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“…Germination of Pitted morning-glory (Oliveira and Norsworthy, 2006) decreased with an increase in drought stress. Seed germination of Ipomoea asarifolia declined linearly with decreasing osmotic potential, and germination ceased at osmotic potential <-0.8 MPa (Dias-Filho, 1996). This suggests that morning-glory species had varying sensitivity to osmotic stress.…”

Section: Effect Of Osmotic Stress On Germinationmentioning

confidence: 96%

Germination Ecology of Ivy-Leaved Morning-Glory: an Invasive Weed in Soybean Fields, Iran

et al. 2020

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Ivy-leaved morning-glory (Ipomoea hederacea Jacq.) is an exotic species that is becoming an increasing problem in soybean fields of Golestan province, Iran. Because little information is available on the biology of this weed species in Iran, experiments were conducted to investigate the effects of different factors on seed germination and emergence of Ivy-leaved morning-glory. Maximum germination occurred at constant temperature of 20 oC (82%) and alternating temperature of 15/25 oC (94%). Germination was reduced with increasing salinity and drought stresses. Sodium chloride concentration and osmotic potential that inhibited 50% maximum germination were -1.64 and -1.03 MPa, respectively. Acidity was a limiting factor for the germination, due to inhibiting effect of alkaline conditions on germination. However, the results showed that high temperature pretreatment >100 oC decreased seed germination. Germination decreased from 82 to 3% as temperature increased from 100 to 130 oC. There was no significant difference between seedling emergence in burial depths of 1 to 10 cm, but emergence reduced with increasing burial depth from 10 to 14 cm, and no seedling was emerged from a depth of 15 cm. The results of the flooding experiment also revealed that the seeds of this species are sensitive to this stress, so that emergence was 9% after 3 d flooding.

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“…They are ecologically characterized by chemically and physically depleted soils with low nutrient supply (especially in P and N), low cation exchange capacities, and high soil compaction [4,7,14,25]. The capoeira is almost completely uprooted and rather unpalatable native grasses, perennial herbs, herbaceous lianas, and shrubs that do not reach the biomass production of capoeira species are invading the areas [3,47,48]. This agricultural weed vegetation formation is locally called "juquira" in the Bragantina region.…”

Section: Species Name Plant (Sub) Familymentioning

confidence: 99%

Accelerating Capoeira Regeneration on Degraded Pastures in the Northeastern Amazon by the Use of Pigs or Cattle

Hohnwald¹,

Kato

Walentowski³

2019

Sustainability

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In the humid tropics of Latin America, considerable proportions of agro-scapes are covered with degraded pastures that were taken over by dense weedy shrub canopies hampering further forest succession. While tree seeds are still constantly dispersed by bats and birds, these often do not reach the soil but got stuck in the dense shrubby vegetation. While manual up-rooting of weedy shrubs or tree replantation is too expensive, we tested if burrowing pigs or trampling cattle can enhance proportions of bare soils for fallow restoration. These hypotheses were tested in on-farm experiments at Igarapé-Açu, northeastern Pará. Soil-opening effects of ten pigs (40 days + nights) and ten oxen (40 overnight stays), respectively, were tested against manual clearing and control on three plots per treatment, respectively. Ground cover percentages of bare soil, weedy shrubs, grasses, and tree species were visually determined in 40 plots/treatment before and directly after treatments, and half a year later (n = 480 samples). Both animal treatments could not really match manual clearing (62%) but pigs reached above 36% bare ground cover, while cattle just 20%. As pigs are almost omnipresent on Amazonian smallholdings and even give a modest economic refund, the use of pigs is recommended to smallholders who want to break up the lush weed layers for the benefit of forest restoration.

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Germination and emergence of Stachytarpheta cayennensis and Ipomoea asarifolia

Abstract: seedlings that emerged from depths greater than 2cm. These germination and emergence responses are discussed in relation to their ecological implications and to weed control strategies.

Cited by 27 publications

References 4 publications

Superação de dormência e influência dos fatores ambientais na germinação de sementes de Spermacoce latifolia

Superação de dormência e influência dos fatores ambientais na germinação de sementes de Spermacoce latifolia

Germination Ecology of Ivy-Leaved Morning-Glory: an Invasive Weed in Soybean Fields, Iran

Accelerating Capoeira Regeneration on Degraded Pastures in the Northeastern Amazon by the Use of Pigs or Cattle

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