análise de crescimento de diferentes genótipos de citros cultivados sob déficit hídrico growth analysis of different citrus genotypes cultivated under water deficit

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ID: 131293
2006
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Abstract
Visando à identificação de genótipos de citros melhor adaptados ao ecossistema de Tabuleiros Costeiros, com potencial de uso como porta-enxertos, avaliou-se seu desempenho em relação à tolerância à seca, considerando a análise de crescimento das plantas. O trabalho foi conduzido em casa de vegetação da Embrapa Mandioca e Fruticultura Tropical, em Cruz das Almas - BA. Foram avaliados seis genótipos: limoeiros 'Cravo' e 'Volkameriano', laranjeira 'Azeda' e os híbridos trifoliados HTR - 051, TSK õ CTTR - 002 e TSK õ CTTR - 017, estes últimos obtidos pelo Programa de Melhoramento Genético de Citros da Embrapa Mandioca e Fruticultura Tropical. Plantas obtidas de sementes (pés-francos ou seedlings) foram cultivadas em substrato Plantmaxâ, irrigando-as até que apresentassem dois ou mais pares de folhas verdadeiras, quando foram transplantadas para recipientes com o mesmo substrato devidamente adubado, mantendo-se o suplemento hídrico até o início das avaliações. O delineamento experimental foi o inteiramente casualizado, em esquema fatorial 6 õ 7, sendo seis genótipos e sete tempos de avaliação. As avaliações foram realizadas sob irrigação, déficit hídrico e re-irrigação, considerando-se o acúmulo de matéria seca total (MS) e a área foliar da planta (AF) como base para a determinação dos seguintes índices fisiológicos: razão de área foliar (RAF), taxa assimilatória líquida (TAL) e taxa de crescimento relativo (TCR). Nas condições do experimento, o híbrido HTR - 051 apresentou menor sensibilidade ao déficit hídrico, o que o qualifica como porta-enxerto promissor para ambientes sujeitos a estiagem prolongada.
Aiming the identification of citrus varieties better adapted to Coastal Table Lands, considering their potential use as rootstocks, the performance of different genotypes for drought tolerance was evaluated, considering their physiological indices related to the growth analyses. The study was carried out in a greenhouse condition of the Embrapa Cassava & Tropical Fruits. Six genotypes were studied: Rangpur lime, Volkamer lemon, Sour orange, and the hybrids HTR - 051, TSK õ CTTR - 002 and TSK õ CTTR - 017, all from the Citrus Breeding Program of the Embrapa Cassava & Tropical Fruits. Seedlings were grown in Plantmaxâ growing media, irrigated adequately until they showed two pairs of true leaves. Afterward, they were transplanted to containers with the same growing media, but chemically fertilized. Seedlings were irrigated until sampling began. The experimental design was completely randomized under a 6 õ 7 factorial, corresponding to six genotypes and seven evaluation sampling dates. The evaluations were carried out for seedlings under irrigation, water deficit, and re-watering. It was evaluated dry matter accumulation (DM), for their different fractions (root and above ground), and leaf area (LA) as the bases for the determination of the physiological indices: leaf area ratio (LAR), net assimilation rate (NAR) and relative growth ratio (RGR). It could be concluded that the hybrid HTR - 051 presented less sensibility to the water deficit, suggesting that it could be indicated as a promissory citrus rootstock for water deficit conditions.
Reference Key
peixoto2006revistaanlise Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;Clovis Pereira Peixoto;Elaine Costa Cerqueira;Walter dos Santos Soares Filho;Manoel Teixeira de Castro Neto;Carlos Alberto da Silva Ledo;Fábio Santos Matos;Jutair Garcia de Oliveira
Journal technocom
Year 2006
DOI
10.1590/S0100-29452006000300022
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452006000300022
Keywords
hybrids poncirus trifoliataplant culture

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