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Crescimento de híbridos e variedades porta-enxerto de citros sob salinidade
Growth of hybrids and rootstock varieties of citrus under salinity. Water and soil salinity affects the growth, development and production of fructiferous species, such as citrus. The use of tolerant rootstocks can guarantee the agribusiness of citrus under such conditions. Thus, the sensibility to...
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Published in: | Acta scientiarum. Agronomy 2011-04, Vol.33 (2), p.259 |
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Main Authors: | , , , , , |
Format: | Article |
Language: | eng ; spa |
Citations: | Items that cite this one |
Online Access: | Get full text |
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Summary: | Growth of hybrids and rootstock varieties of citrus under salinity. Water and soil salinity affects the growth, development and production of fructiferous species, such as citrus. The use of tolerant rootstocks can guarantee the agribusiness of citrus under such conditions. Thus, the sensibility to salinity during the phase of rootstock formation of varieties and selected hybrids was studied. The experiment was carried out in a greenhouse, with five levels of irrigation water salinity [control, tap water with electrical conductivity ([EC.sub.w]) of 0.41 dS [m.sup.-1], and water with [EC.sub.w] of 1.0, 2.0, 3.0 and 4.0 dS [m.sup.-1]] and seven genotypes, in a randomized block design and five replications each consisting of four plants, during 150 day period. Growth and physiologic variables were evaluated. Significant effects of genotypes and salinity in the variables were observed. The most expressive reduction was found for total dry matter with unit increase of [EC.sub.w]. A linear reduction was observed in hybrids LVK x LVA-009 and TSK x TRENG-256. Among the evaluated genotypes 'Volkamer' lemon was the least sensitive to saline stress. Keywords: Citrus spp., seedlings, abiotic stress. A salinidade da agua e do solo afeta o crescimento, o desenvolvimento e a producao de especies frutiferas, dentre as quais os citros. O uso de porta-enxertos tolerantes pode garantir a sustentabilidade do agronegocio citricola em tais condicoes. Assim, estudou-se a sensibilidade a salinidade durante a fase de formacao de porta-enxertos compreendendo variedades e hibridos selecionados. O experimento foi realizado em casa-de-vegetacao, considerando cinco niveis de salinidade da agua de irrigacao [testemunha, irrigacao com agua de abastecimento local, condutividade eletrica da agua ([CE.sub.a]) de 0,41 dS [m.sup.-1] e agua com [CE.sub.a] de 1,0; 2,0; 3,0 e 4,0 dS [m.sup.-1]] e sete genotipos, utilizando delineamento em blocos casualizados, com cinco repeticoes em esquema fatorial e quatro plantas uteis por parcela, durante o periodo de 150 dias. Avaliaram-se variaveis de crescimento e fisiologicas. A reducao mais expressiva foi observada na fitomassa seca total da parte aerea com aumento unitario da [CE.sub.a]. Observou-se reducao linear no crescimento com aumento da salinidade nos hibridos LVK x LVA-009 e TSK x TRENG-256. Dentre os genotipos avaliados, o limoeiro 'Volkameriano' foi o menos sensivel ao estresse salino. Palavras-chave: Citrus spp., mudas, estresse abiotico. |
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ISSN: | 1679-9275 1807-8621 |
DOI: | 10.4025/actasciagron.v33i2.5582 |