Bulliform cells in Loudetiopsis chrysothrix (Nees) Conert and Tristachya leiostachya Nees (Poaceae): structure in relation to function

Alvarez, Juliana Magalhães; Rocha, Joecildo Francisco; Machado, Sílvia Rodrigues

doi:10.1590/s1516-89132008000100014

Cited by 80 publications

(47 citation statements)

References 19 publications

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“…Several studies had shown the increase of sclerenchyma in response to low water availability (Bacelar et al, 2004), an alteration that is important for the plants to avoid water loss. The first cycles produced higher quantity of this tissue, which shows a possible attempt to save water, since these cycles showed a more vulnerable vascular system than the last cycles.…”

Section: Resultsmentioning

confidence: 99%

“…A greater number of bulliform cells with bigger polar diameter in the initial cycles is possibly related to leaf curling, which leads to a decrease in the transpiration surface area (Alvarez et al, 2008). This fact is important at the initial cycles, because they are more sensitive to flooding.…”

Section: Resultsmentioning

confidence: 99%

“…This variety is currently in its 18 th annual selection cycle. Its ability to tolerate intermittent periods of flooding is due to the presence of different biochemical and physiological mechanisms, and also to root morphoanatomical modifications, such as the formation of aerenchyma and the modification of the vascular tissues (Ferreira et al, 2008;Pereira et al, 2008). Leaves of the 'Saracura' maize (BRS-4154) cultivated in a greenhouse with root flooding presented variations in the diameter of the vascular bundles as well as in the size and amount of stomata (Melo et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

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Leaf plasticity in successive selection cycles of 'Saracura' maize in response to periodic soil flooding

Souza

Magalhães

Pereira

et al. 2010

Pesq. agropec. bras.

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-The objective of this work was to assess the effect of successive selection cycles on leaf plasticity of 'Saracura' maize BRS-4154 under periodical flooding in field conditions. Soil flooding started at the six-leaf stage with the application of a 20-cm depth water layer three times a week. At flowering, samples of leaves were collected and fixed. Paradermic and transverse sections were observed under photonic microscope. Several changes were observed throughout the selection cycles, such as modifications in the number and size of the stomata, higher amount of vascular bundles and the resulting decrease of the distance between them, smaller diameter of the metaxylem, decrease of cuticle and epidermis thickness, decrease of number and size of bulliform cells, increase of phloem thickness, smaller sclerenchyma area. Therefore, the successive selection cycles of 'Saracura' maize resulted in changes in the leaf anatomy, which might be favorable to the plant's tolerance to the intermittent flooding of the soil.Index terms: Zea mays, hypoxia, leaf anatomy, tolerance to flooding. Plasticidade foliar nos sucessivos ciclos de seleção do milho'Saracura' em resposta ao alagamento intermitente do soloResumo -O objetivo deste trabalho foi avaliar o efeito de sucessivos ciclos de seleção na plasticidade foliar do milho 'Saracura' BRS-4154 sob alagamento intermitente do solo em condições de campo. O alagamento do solo iniciou-se no estádio de seis folhas com a aplicação de uma lâmina de 20 cm de água três vezes por semana. No florescimento, foram coletadas e fixadas amostras das folhas. Secções paradérmicas e transversais de amostras foram observadas em microscópio fotônico. Várias modificações foram observadas durante os ciclos de seleção, como o número e o tamanho dos estômatos, a maior quantidade de feixes vasculares e a consequente diminuição da distância entre eles, o metaxilema com diâmetros menores, a diminuição da espessura da cutícula e da epiderme, a diminuição no número e tamanho das células buliformes, o aumento da espessura do floema e a menor área de esclerênquima. Os sucessivos ciclos de seleção do milho 'Saracura', portanto, levaram a mudanças na anatomia foliar, as quais podem ser favoráveis à tolerância da planta ao alagamento intermitente do solo.Termos para indexação: Zea mays, hipoxia, anatomia foliar, tolerância ao alagamento.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Leaf plasticity in successive selection cycles of 'Saracura' maize in response to periodic soil flooding

Souza

Magalhães

Pereira

et al. 2010

Pesq. agropec. bras.

View full text Add to dashboard Cite

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“…It has been shown that under drought conditions, bulliform cells lose turgor pressure and shrink, leading to the rolling up of leaves. Once water is sufficient, the bulliform cells expand and the leaves open again (Price et al, 1997;Alvarez et al, 2008). However, the molecular and genetic mechanisms of leaf rolling and the function of bulliform cells in leaf rolling remain to be elucidated.…”

mentioning

confidence: 99%

SEMI-ROLLED LEAF1 Encodes a Putative Glycosylphosphatidylinositol-Anchored Protein and Modulates Rice Leaf Rolling by Regulating the Formation of Bulliform Cells

et al. 2012

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Leaf rolling is an important agronomic trait in rice (Oryza sativa) breeding and moderate leaf rolling maintains the erectness of leaves and minimizes shadowing between leaves, leading to improved photosynthetic efficiency and grain yields. Although a few rolled-leaf mutants have been identified and some genes controlling leaf rolling have been isolated, the molecular mechanisms of leaf rolling still need to be elucidated. Here we report the isolation and characterization of SEMI-ROLLED LEAF1 (SRL1), a gene involved in the regulation of leaf rolling. Mutants srl1-1 (point mutation) and srl1-2 (transferred DNA insertion) exhibit adaxially rolled leaves due to the increased numbers of bulliform cells at the adaxial cell layers, which could be rescued by complementary expression of SRL1. SRL1 is expressed in various tissues and is expressed at low levels in bulliform cells. SRL1 protein is located at the plasma membrane and predicted to be a putative glycosylphosphatidylinositol-anchored protein. Moreover, analysis of the gene expression profile of cells that will become epidermal cells in wild type but probably bulliform cells in srl1-1 by laser-captured microdissection revealed that the expression of genes encoding vacuolar H+-ATPase (subunits A, B, C, and D) and H+-pyrophosphatase, which are increased during the formation of bulliform cells, were up-regulated in srl1-1. These results provide the transcript profile of rice leaf cells that will become bulliform cells and demonstrate that SRL1 regulates leaf rolling through inhibiting the formation of bulliform cells by negatively regulating the expression of genes encoding vacuolar H+-ATPase subunits and H+-pyrophosphatase, which will help to understand the mechanism regulating leaf rolling.

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“…Leaf tissues such as epidermal and/or bulliform cells possess large vacuoles (Alvarez et al 2008;Moulia 2000) which serve as a dump for high amount of Na ? /Cl -ions that are transported to the leaves under stress conditions, to protect physiologically active mesophyll cells (Tester and Davenport 2003).…”

Section: Introductionmentioning

confidence: 99%

Morpho-physiological variations in response to NaCl stress during vegetative and reproductive development of rice

et al. 2012

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The complex nature of plant resistance to adverse environmental conditions, such as salinity and drought requires a better understanding of the stress-induced changes that may be involved in tolerance mechanisms. Here we investigate stress-related morpho-physiological effects during vegetative and reproductive growth in two Japonica rice cultivars (Bomba and Bahia) exposed to a range of NaCl concentrations from the seedling stage. The stress-related detrimental effects were observed either earlier or to a higher extent in cv. Bomba than in Bahia. Damages to the photosynthetic apparatus were related to loss of chlorophyll (Chl) and to a decrease of the maximum potential efficiency of PSII (F v /F m ), affecting negatively net CO 2 assimilation rate (P N ). Stress-related leaf anatomical alterations were analysed during the vegetative and reproductive stages. The size of bulliform cells as well as dimensions related to the vascular system increased under mild stress but decreased in the longer term or under higher stress level. The pattern of the anatomical alterations observed at the reproductive stage under 20 mM NaCl was reflected in poor panicle development and yield loss, with effects more pronounced in cv. Bomba than in Bahia. In summary, our results show that some physiological and, particularly, leaf anatomical responses induced by NaCl stress are distinctive indicators of sensitivity to salt stress in rice cultivars.

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Bulliform cells in Loudetiopsis chrysothrix (Nees) Conert and Tristachya leiostachya Nees (Poaceae): structure in relation to function

Abstract: This work reports anatomic and ultrastructural characteristics of bulliform cells in Loudetiopsis chrysothrix

Cited by 80 publications

References 19 publications

Leaf plasticity in successive selection cycles of 'Saracura' maize in response to periodic soil flooding

Leaf plasticity in successive selection cycles of 'Saracura' maize in response to periodic soil flooding

SEMI-ROLLED LEAF1 Encodes a Putative Glycosylphosphatidylinositol-Anchored Protein and Modulates Rice Leaf Rolling by Regulating the Formation of Bulliform Cells

Morpho-physiological variations in response to NaCl stress during vegetative and reproductive development of rice

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