Phytotoxicity assessment of biodegradable and non-biodegradable plastics using seed germination and early growth tests

The preparation and biological examination of a number of arylcarbamic esters (arylurethanes) are described. The experiments demonstrate the marked effect of iso propyl phenylcarbamate and some related compounds in very low concentrations upon the germination and seedling growth of cereals. The absence of effect of the same compounds in similar concentrations upon some dicotyledonous plants is noted.

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Stimulation of seed germination and early growth by humic substances on poppy, pepper, rape, and hemp

Biologia ◽

10.1007/s11756-021-00952-1 ◽

2021 ◽

Author(s):

Božena Šerá ◽

František Novák

Keyword(s):

Seed Germination ◽

Humic Substances ◽

Early Growth ◽

Stimulation Of

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Biomass production of five biofuel crops and phytotoxicity to seed germination and early growth of nine plants grown in polycyclic aromatic hydrocarbons heavily contaminated soil

Acta Phytopathologica et Entomologica Hungarica ◽

10.1556/aphyt.47.2012.2.18 ◽

2012 ◽

Vol 47 (2) ◽

pp. 385-402

Author(s):

D. Paquin ◽

K. Yanagihara ◽

W. Grannis ◽

Q. Li

Keyword(s):

Polycyclic Aromatic Hydrocarbons ◽

Seed Germination ◽

Biomass Production ◽

Aromatic Hydrocarbons ◽

Contaminated Soil ◽

Early Growth ◽

Biofuel Crops ◽

Polycyclic Aromatic

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ALLELOPATHIC POTENTIAL OF Cyperus rotundus L. EXTRACTS ON GERMINATION AND COWPEA SEEDLING ESTABLISHMENT

Nativa ◽

10.31413/nativa.v6i3.4708 ◽

2018 ◽

Vol 6 (3) ◽

pp. 261

Author(s):

João Alves Ferreira Pereira ◽

Tatiana Maria da Silva ◽

Andreza Raquel Barbosa de Farias ◽

Alexandre Bosco de Oliveira

Keyword(s):

Seed Germination ◽

Vigna Unguiculata ◽

Early Growth ◽

Shoot Length ◽

Cyperus Rotundus ◽

Control Treatment ◽

Root Weight ◽

Allelopathic Potential ◽

Germination Speed ◽

Allelopathic Effects

POTENCIAL ALELOPÁTICO DE EXTRATOS DE Cyperus rotundus L. NA GERMINAÇÃO E ESTABELECIMENTO DE PLÂNTULAS DE FEIJÃO-CAUPI Este trabalho investigou os efeitos alelopáticos de extratos de Cyperus rotundus L. na germinação de sementes e crescimento inicial das plântulas de Vigna unguiculata L. Walp. Extratos alcoólicos nas concentrações 0; 1,5%; 3,0%; 4,5%; 6,0%; 7,5% e 9,0%, obtidos a partir da trituração de folhas de C. rotundus L. foram utilizados para umedecimento das folhas de papel toalha “germitest”. Os dados foram submetidos a análise de variância pelo F e as médias comparadas pelos testes de Tukey e Kruscal-Wallis, ambos a 5% de probabilidade. A primeira contagem de germinação, índice de velocidade de germinação, comprimento de raiz, comprimento da parte aérea e massa seca da raiz do feijão-caupi foram analisados de forma paramétrica, sendo constatado que apenas houve significância na variável primeira contagem e uma redução na germinação em relação ao tratamento controle em torno de 10%. Nas condições em que essa pesquisa foi realizada, os extratos alcoólicos de C. rotundus L. não afetam a germinação de sementes e crescimento inicial das plântulas de feijão-caupi.Palavras-chave: tiririca, alelopatia, interferência, plantas daninhas. ABSTRACT:This study aimed to investigate the allelopathic effects of Cyperus rotundus L. extracts on seed germination and early development of seedlings of Vigna unguiculata L. Walp. Alcoholic extracts at concentrations of 0, 1.5%, 3%, 4.5%, 6.0%, 7.5%, and 9.0% were obtained by crushing C. rotundus L. leaves used to moisten the “germitest” paper sheets. The data were subjected to analysis of variance and also both Tukey and Kruscal-Wallis tests were carried out at 5% for the data means. The first germination count, germination speed index, root length, shoot length, and dry root weight of cowpea were parametrically analyzed. The only variable with significance was first germination count. The germination reducted in relation to the control treatment around 10%. Thus, in the conditions used in this research, alcoholic extracts of C. rotundus L. did not affect either seed germination or early growth of cowpea seedlings.Keywords: nut grass, allelopathy, interference, weeds. DOI:

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Seed germination and antioxidant enzyme activity in seedlings of diploid and tetraploid bahiagrass under water restriction

Ciência Rural ◽

10.1590/0103-8478cr20190382 ◽

2020 ◽

Vol 50 (5) ◽

Author(s):

Gabriel Streck Bortolin ◽

Alfredo José Salinas-Arcienega ◽

Yutcelia Carolina Galviz-Fajardo ◽

Luciano do Amarante ◽

Carlos Eduardo da Silva Pedroso ◽

...

Keyword(s):

Seed Germination ◽

Physiological Responses ◽

Dry Mass ◽

Germination Percentage ◽

Early Growth ◽

Paspalum Notatum ◽

Water Restriction ◽

Germination Test ◽

Growth Activity ◽

Higher Temperature

ABSTRACT: The objective of the following research was to investigate the physiological responses of two bahiagrass genotypes (Paspalum notatum Flügge) submitted to water restriction, induced by polyethylene glycol (PEG6000), during seed germination. Seeds of cv. Pensacola (diploid) and Bagual ecotype (tetraploid) were placed on paper moistened with osmotic solutions at potentials of 0.0; -0.1; -0.2 and -0.3 MPa. Composed of two subsamples of 100 seeds and four experimental units per treatment, the germination test was conducted in a germination chamber under alternating temperatures of 30 °C (8 hours) and 20 °C (16 hours), with presence of light during the higher temperature. Final germination percentage and germination speed index of the seeds, as well as early growth, activity and expression of antioxidant enzymes of seedlings were evaluated. The water restriction induced by PEG6000 reduced the percentage of germination in Pensacola (from 74% to 59%) and Bagual (34% to 10%). For the latter, the evaluation of seedlings showed higher dry mass in relation to cv. Pensacola (1.7 times higher in root and 1.6 times in shoot). In response to moderate water restriction, the genotypes showed increases in root growth (1.7 times higher in -0.1 compared to 0.0 MPa), both in expression and enzymatic activity (superoxide dismutase and catalase).

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