Efeito Do Nível De Umedecimento Do Substrato Sobre a Germinação De Cucurbitaceas

Menezes, Nilson de Centro de Ciências Rurais Lemos; Silveira, T.L.D. da; Storck, Lindolfo

doi:10.1590/s0103-84781993000200006

Cited by 16 publications

(9 citation statements)

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“…Four replications of 50 seeds of the common bean (Phaseolus vulgaris L.) cultivars 'Carioca' and 'Mulatinho' were submitted to the germination test in a germinator at 25 0 C, according to a totally randomized design. These seeds germinated on "germitest" papers imbibed in distilled water (H 2 O d ) or in sodium chloride (NaCl) solutions at a proportion of 2.5 times the weight of the paper (Menezes et al, 1993). The NaCl concentrations were 10, 50, 100 and 200 mol.m -3 , whose electrical conductivity (EC, S.m -1 ) was measured with a conductivity meter and the osmotic potential (Y, MPa) was calculated according to Vijayan (2003).…”

Section: Methodsmentioning

confidence: 99%

Germination, initial growth and cotyledon protein content of bean cultivars under salinity stress

Dantas

Ribeiro²,

Aragão

2007

Rev. bras. sementes

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ABSTRACT-Excess salts in the root zone inhibit water uptake by plants, affect nutrient uptake and may result in toxicities due to individual salts in the soil solution. Excess exchangeable sodium in the soil may destroy the soil structure to a point where water penetration and root aeration become impossible. Sodium is also toxic to many plants. Beans (Phaseolus vulgaris L.) are consumed as protein source in northeastern Brazil, although little is known about common bean cultivar tolerance to salinity. The germination of bean cultivars under salt stress was studied. The cultivars 'Carioca' and 'Mulatinho' were submitted to germination test in a germinator at 25 0 C, at the Seed Analysis Laboratory of the Brazilian Agricultural Research Corporation unit in the Semi-Arid region (Embrapa Semi Árido), Petrolina, Pernambuco State. These seeds were germinated on "germitest" papers imbibed in distilled water or in 10, 50, 100 e 200 mol.m -3 sodium chloride (NaCl) solutions. At the first and second counts of the germination test, normal seedlings were counted, measured, weighed and dried, supplying data for vigor, total germination, fresh matter weight and dry matter weight and seedlings length. Total protein was quantified in cotyledons at 3, 6 and 9 days after sowing. The results indicated that the NaCl content influenced seed germination and concentrations above 50 mol.m -3 decreased germination and seedling growth.Index terms: Phaseolus vulgaris, vigor, sodium chloride. GERMINAÇÃO, CRESCIMENTO INICIAL E TEOR DE PROTEÍNA NOS COTILÉDONES DE FEIJÃO EM ESTRESSE SALINORESUMO-O excesso de sais no sistema radicular inibe a absorção de água, absorção de nutrientes e pode resultar em toxicidade de alguns sais dissolvidos na solução do solo. Excesso de sódio trocável no solo pode destruir a estrutura do solo a um ponto em que a penetração de água e a aeração das raízes se tornam impossível. Além disso, o sódio é tóxico a muitas plantas. Feijão (Phaseolus vulgaris L.) é consumido como fonte de proteínas no nordeste do Brasil, no entanto pouco se sabe sobre a tolerância desses feijões à salinidade. Este trabalho objetivou o estudo da germinação de sementes e crescimento inicial de plântulas de duas cultivares de feijão ao estresse salino. As cultivares 'Carioca' e 'Mulatinho' foram submetidas ao teste de germinação em germinador a 25 0 C, no Laboratório de Análises de Sementes da Embrapa Semi Árido, Petrolina, Pernambuco. As sementes germinaram em papel "germitest" embebido em água destilada ou em soluções de cloreto de sódio (NaCl) nas concentrações de 10, 50, 100 e 200 mol.m -3 . Na primeira e segunda contagens do teste de germinação as plântulas normais foram contadas, medidas, pesadas e secadas, obtendo-se dados de vigor e germinação total, massa de matéria fresca e seca, e comprimento de plântulas. O teor de proteínas totais foi quantificado em cotilédones aos 3, 6 e 9 dias após semeadura. Os resultados indicam que ao teor de NaCl influenciou na germinação e que concentrações acima de 50 mol.m -3 inibiram a germinação e o ...

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Section: Methodsmentioning

confidence: 99%

Germination, initial growth and cotyledon protein content of bean cultivars under salinity stress

Dantas

Ribeiro²,

Aragão

2007

Rev. bras. sementes

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“…Four replications of 50 seeds of the cultivars 'Epace-10'; 'Canapu' and 'Pitiúba' of cowpea (Vigna unguiculata L. Walp), were submitted to germination test in germinator at 25 0 C, according to a totally randomized design. These seeds germinated in "germitest" papers imbibed in distilled water (H 2 O) or in sodium chloride (NaCl) solutions in a proportion of 2,5 times the weight of the paper (Menezes et al, 1993). The NaCl concentrations were 0, 10, 50, 100 e 200mol.m -3 , which electrical conductivity (EC, S m -1 ) was measured with a conductivimeter and the osmotic potential (Ψ π , MPa) was calculated according to Vijayan (2003).…”

Section: Methodsmentioning

confidence: 99%

Physiological response of cowpea seeds to salinity stress

Dantas

Ribeiro

Aragão

2005

Rev. bras. sementes

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ABSTRACT-This work aimed to evoluate physiological response of cowpea (Vigna unguiculata L. Walp) seeds submitted to salt stress. Seeds of cultivars 'Epace-10'; 'Canapu' and 'Pitiúba' of cowpea, were submitted to germination test in germinator at 25 0 C, in "germitest" papers imbibed in distilled water or in 0, 10, 50, 100 and 200mol m -3 NaCl solutions. At the first and second counting of the germination test, normal seedlings were accounted, weighted and dried, obtaining data for vigor, total germination, fresh matter weight and dry matter weight. The seedlings hypocotyls, root and total length were measured total proteins content in cotyledons were obtained from germinating seeds. The presence of salt at concentrations higher than 50mol m -3 NaCl affect the germination, seedlings growth and cotyledons total protein synthesis of all cowpea cultivars. The seeds of cultivar pitiúba were is more tolerant to salinity, than the cultivars Canapu and Epace-10. . Na primeira e segunda contagem do teste de germinação, as plântulas normais foram contadas, pesadas e secadas, obtendo-se dados de vigor, germinação, massa de matéria fresca e massa de matéria seca. O comprimento do hipocótilo, raiz e total foram medidos e o teor de proteínas totais nos cotilédones foi obtido em plântulas de 3, 5 e 8 dias. As concentrações de NaCl acima da 50mol m -3 afetam a germinação e o vigor das sementes, crescimento de plântulas, bem como a síntese de proteínas totais. As sementes da cultivar Pitiúba são mais tolerantes à salinidade do que as cultivares Canapu e Epace-10.Termos para indexação: Vigna unguiculata, cloreto de sódio, germinação,vigor.

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“…Pesquisas sobre as exigências de água em sementes são incipientes, estando disponíveis informações sobre a espécie florestal angelim-pedra, Dinizia excelsa (Mesquita, 2004) e algumas espécies agrícolas (Phaneendranath, 1980;Tanaka et al, 1991;Menezes at al., 1993;Novembre & Marcos Filho, 1999;Gentil & Torres, 2001).…”

Section: Introductionunclassified

Influência da temperatura e da quantidade de água no substrato sobre a germinação de sementes de Ochroma pyramidale (Cav. ex Lam.) Urban (pau-de-balsa)

Ramos¹,

Varela²,

Melo³

2006

Acta Amaz.

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Efeito Do Nível De Umedecimento Do Substrato Sobre a Germinação De Cucurbitaceas

Cited by 16 publications

References 1 publication

Germination, initial growth and cotyledon protein content of bean cultivars under salinity stress

Germination, initial growth and cotyledon protein content of bean cultivars under salinity stress

Physiological response of cowpea seeds to salinity stress

Influência da temperatura e da quantidade de água no substrato sobre a germinação de sementes de Ochroma pyramidale (Cav. ex Lam.) Urban (pau-de-balsa)

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