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| Tapia F,María Luisa; Toro A,Guillermo ; Parra R,Bélgica ; Riquelme E,Alejandro. |
| The intensity of ultraviolet-B radiation (UV-B) has increased on the Earth´s surface due to the stratospheric ozone depletion, causing an adverse effect on a wide range of species, such as morphological, physiological, and biochemical alterations. This research studied the intraspecific photosensitivity of cucumber (Cucumis sativus L.) seedlings exposed to UV-B. Six commercial cultivars were evaluated: Laura, Sprint 440, Dasher II, Exocet, Poinsett 76, and Marketmore 76 under greenhouse-controlled environmental conditions with a hydroponic sandwich-type system with a Hoagland II nutrient solution. Seedlings were irradiated from expanded cotyledons to the third true leaf with three intensities of UV-B radiation (30, 40, and 50 μW cm-2) for 18 d... |
| Tipo: Journal article |
Palavras-chave: UV radiation; Chlorophyll; UV-B absorbing compounds; Chlorosis. |
| Ano: 2010 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392010000100002 |
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| CUNHA, N. G. da; POTT, A.; GONCALVES, A. R.. |
| As "cordilheiras" da sub-regiao do Abobral, Pantanal Mato-Grossense, tem como material de origem, conchas de moluscos transportadas da planicie de inundacao do rio Miranda, de aguas e sedimentos alcalinos. Os solos, desenvolvidos sobre material essencialmente carbonatico (calcimorficos), constituem-se em ilhas com vegetacao de mata semicaducifolia, isolada nas planicies inundaveis de solos acidos do rio Abobral. Os solos em condicoes de hidromorfismo temporario formam um epipedon molico sobre um horizonte petrocalcico. Pela classificacao do Departamento de Agricultura do E.U.A. de 1949 sao denominados de Calcissolos e de Aeric Petrocalcic Calciaquoll pela Soil Taxonomy. A vegetacao original e a secundaria (ruderal) sao descritas. O desmatamento e o cultivo... |
| Tipo: Circular Técnica (INFOTECA-E) |
Palavras-chave: Solo calcimorfico; Rio Abobral; Forrageira; Deficiencia de ferro; Nitritos; Plant; Iron defficiency; Nitrite; Petrocalcic calciaquoll.; Brachiaria; Clorose; Planta; Solo Ácido.; Pantanal; Forage; Chlorosis; Soil.. |
| Ano: 1985 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/787719 |
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| Campanharo,Marcela; Monnerat,Pedro Henrique; Espindula,Marcelo Curitiba; Rabello,Wanderson Souza; Ribeiro,Guilherme. |
| Despite the importance of nickel (Ni) in the N metabolism of legumes, common bean (Phaseolus vulgaris L.) is considered very sensitive to Ni doses. The objective in this study was to characterize the toxicity symptoms of Ni in common bean cv. Pérola. The experiment was conducted in greenhouse in the campus of the Universidade Estadual do Norte Fluminense - Darcy Ribeiro, Campos dos Goytacazes - RJ. Solutions containing 0; 20; 40; 60 and 100 mg L-1 of Ni, in the form of nickel chloride hexahydrate (NiCl2.6H2O), were applied to shoots of common bean plants at the rate of 2.5 mL of solution per plant of common bean, 25 days after sowing. Plants of common bean treated with 0; 20; 40 and 60 mg L-1 of Ni showed no toxicity symptoms. Plants treated with 100 mg... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Phaseolus vulgaris L; Chlorosis; Necrosis. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902010000300024 |
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