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| Ma,Yuan-Yuan; Guo,Xiu-Lin; Liu,Bin-Hui; Liu,Zi-Hui; Shao,Hong-Bo. |
| The changes of cell ultra structure as well as Ca2+ homeostasis involved in the drought-induced maize leaf senescence was investigated. Meanwhile, many indicatives of leaf senescence including thiobarbituric acid reactive substance (MDA), electrolyte leakage (EL), and chlorophyll along with soluble proteins were also detected during the process. The Polyethylene glycol6000(PEG6000)-incubated detached leaves showed a slight increase in the MDA content and electrolyte leakage during the first 30 min of our detection, which was corresponded to an unobvious alteration of the cell ultrastructure. Other typical senescence parameters measured in whole leaf exhibited a moderate elevation as well. Thereafter, however, the EL and MDA rose to a large extent, which... |
| Tipo: Journal article |
Palavras-chave: Ca2+ homeostasis; Drought; Leaf senescence; Maize; Organelle ultrastructure; Signal transduction. |
| Ano: 2011 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000300004 |
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| Gomide,Carlos Augusto de Miranda; Paciullo,Domingos Sávio Campos; Costa,Igor de Almeida; Lima,Aline Medeiros; Castro,Carlos Renato Tavares de; Lédo,Francisco José da Silva. |
| The aim of this study was to evaluate during the dry and rainy seasons the morphogenesis traits of two clones of dwarf elephant grass under different management strategies. The study was conducted in a factorial 2 × 2 × 3 design, using two clones, one green and one purple, two residual heights, 25 and 45 cm, and three frequencies of defoliation according to the light interception of 90, 95 and 100%. The design was a randomized block with three replications. The variables were leaf elongation and leaf senescence rate, stem elongation rate and phyllochron. The leaf lifespan and the number of living leaves per tiller were also estimated. The clones presented low stem elongation rates, showing adaptation for grazing use. In the rainy season, the light... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Leaf elongation; Leaf senescence; Light interception; Pennisetum purpureum; Phyllochron; Stem elongation. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982011000700007 |
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| Diaz-Mendoza,Mercedes; Velasco-Arroyo,Blanca; Santamaria,M. Estrella; González-Melendi,Pablo; Martinez,Manuel; Diaz,Isabel. |
| Abstract Senescence-associated proteolysis in plants is a complex and controlled process, essential for mobilization of nutrients from old or stressed tissues, mainly leaves, to growing or sink organs. Protein breakdown in senescing leaves involves many plastidial and nuclear proteases, regulators, different subcellular locations and dynamic protein traffic to ensure the complete transformation of proteins of high molecular weight into transportable and useful hydrolysed products. Protease activities are strictly regulated by specific inhibitors and through the activation of zymogens to develop their proteolytic activity at the right place and at the proper time. All these events associated with senescence have deep effects on the relocation of nutrients... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Barley; Cysteine-proteases; Leaf senescence; Protein traffic; Protein recycling; Proteolysis. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572016000300329 |
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| Zhu,Keming; Tao,Huimin; Xu,Shuo; Li,Kaixia; Zafar,Sundus; Cao,Wei; Yang,Yanhua. |
| Abstract Senescence, a highly programmed process, largely determines yield and quality of crops. However, knowledge about the onset and progression of leaf senescence in crop plants is still limited. Here, we report that salt-induced protein (salT), a new gene, may be involved in leaf senescence. Overexpressing salT could prolong the duration of leaves with higher concentrations of chlorophyll compared with the wild type. Moreover, overexpression of salT could delay the senescence of rice leaves though the inhibition of senescence associated genes (SAGs). Overall, the characterization of salT suggested that it is a new gene affecting the leaf senescence induced by natural and dark conditions. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Leaf senescence; Salt-induced protein (salT); Rice; Stay-green. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572019000100080 |
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