Métodos de semeadura na condução de populações segregantes de aveia e suas interações com o ambiente de seleção

Marchioro, Volmir Sérgio; Carvalho, Fernando Irajâ Félix de; Oliveira, Antônio Costa de; Lorencetti, Claudir; Benin, Giovani; Hartwig, Irineu; Schimidt, Douglas; Cargnin, Adeliano; Simioni, Daniel

doi:10.1590/s0103-84782005000200007

Cited by 2 publications

(1 citation statement)

References 7 publications

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“…Cultivated citrus plants are constantly exposed to thousands of microorganisms and abiotic factors that may compromise their production, including drought periods resulting from irregular rainfall and dry spells during the rainy season (Pinto et al, 2008). Knowing the environmental contribution to phenotypic manifestation enables optimization of the selection of new cultivars and therefore, the selection of superior genotypes under any condition (Marchioro et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

Morphological characterization of leaves at different crown positions of tangerine genotypes

Pacheco

Andrade

Pereira

et al. 2018

Agraria

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The leaf anatomy has been shown as an important tool to understand the interaction between this organ and its microclimate but this topic is still unclear for citrus plants. The objective of this study was to analyze the leaf structure of Ponkan, Fremont and Thomas tangerine and Murcott tangor. Fully expanded leaves were collected collected, from the 2 nd and 3 rd nodes of plagiotropic branches facing West, at three crown heights (lower, middle and upper). The leaves were fixed in 70% ethanol and embedded in historesin and sectioned in a semi-automatic microtome. The sections were stained with toluidine blue; images were captured under a light microscope coupled and analyzed to measure leaf tissue thickness. The Fremont tangerine leaves had greater epidermis thickness on the adaxial and abaxial surfaces and secretory cavity diameter as well as a shorter distance between secretory cavities, whereas the Murcott leaves had greater palisade and spongy parenchyma thickness. Thus, Fremont and Murcott are potential varieties for xeric conditions, as they are able to reduce transpiration and make optimal use of high incident radiation. The microclimates created by plant architecture may affect the leaf anatomy of the Ponkan, Fremont and Thomas and Murcott trees, allowing anatomical plasticity.

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Section: Introductionmentioning

confidence: 99%

Morphological characterization of leaves at different crown positions of tangerine genotypes

Pacheco

Andrade

Pereira

et al. 2018

Agraria

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Produção de fitomassa em genótipos de citros submetidos a estresse hídrico na formação do porta-enxerto

Suassuna¹,

Fernandes

Nascimento³

et al. 2012

Rev. bras. eng. agríc. ambient.

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R ESU M ODevido à importância dos porta-enxertos no sucesso da citricultura e sua influência na tolerância a fatores de estresse, desenvolveu-se este estudo com o objetivo de avaliar a tolerância de porta-enxertos de citros ao estresse hídrico. Estudaram-se dois fatores: manejo hídrico ('sem estresse' e 'com estresse', neste último caso, com irrigação baseada em 50 e 25% da capacidade de campo) e porta-enxerto (10 genótipos de citros fornecidos pelo Programa de Melhoramento Genético de Citros da Embrapa Mandioca e Fruticultura Tropical). Adotou-se o delineamento em blocos casualizados com três repetições e 15 plantas por parcela; avaliaram-se as fitomassas da parte aérea, das folhas, do caule, da raiz e total, além da relação raiz/parte aérea, razão de peso foliar e rendimento relativo. O déficit hídrico reduziu a fitomassa total e incrementou, em alguns porta-enxertos, a relação raiz/parte aérea. A fitomassa foliar é a variável mais afetada, negativamente, nos porta-enxertos de citros sob deficiência hídrica. O genótipo 'TSKFL x CTTR-017' possui capacidade de adaptação ao déficit hídrico, com potencial promissor para uso em áreas sujeitas às condições de seca. Palavras-chave: Citrus spp, híbridos, deficiência hídrica, tolerânciaDry matter production of citrus genotypes under water stress during the rootstock formation A B ST R A C T Knowing the importance of the rootstocks for the success of the citrus crop and its influence on tolerance to stress factors, this study was conducted in order to evaluate tolerance of citrus rootstocks to water stress studying two factors: water management ('without stress' and 'under stress' and in this latter case, the irrigation was based on 50 and 25% moisture of field capacity) and rootstocks factor (10 citrus genotypes provided by Citrus Breeding Program of Embrapa Cassava and Tropical Fruits). A randomized block design was adopted with three replications and 15 plants per plot. Shoot, leaves, stem, root and total dry mass, root/shoot ratio, leaf weight ratio and relative yield were evaluated. Water deficit reduced the total dry mass and increased the root/shoot ratio in some rootstocks. Leaf dry mass is the most sensible variable in citrus rootstocks under water deficit. 'TSKFL CTTR x-017' has a significant capacity of tolerance to drought, with promising potential for use in areas under drought conditions.

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Métodos de semeadura na condução de populações segregantes de aveia e suas interações com o ambiente de seleção

Cited by 2 publications

References 7 publications

Morphological characterization of leaves at different crown positions of tangerine genotypes

Morphological characterization of leaves at different crown positions of tangerine genotypes

Produção de fitomassa em genótipos de citros submetidos a estresse hídrico na formação do porta-enxerto

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