carnation (dianthus caryophyllus l.) is one of the most important cut flowers in the world. themajority of thecarnation cultivars are sensitive to ethylene which affected the physiological and biochemical postharvest characteristics of these flowers.applying inhibitors of biosynthesis and action of ethylene is important factor to protect the display quality and extend postharvest life. in order...

To identify senescence-associated genes (SAGs) in rice leaves, senescence was induced by transferring rice seedlings into darkness. Senescence up-regulated cDNAs were obtained by PCR-based subtractive hybridization. Among 14 SAG clones characterized, 11 were found to be associated with both dark-induced and natural leaf senescence. Three clones were associated only with dark-induced leaf senesc...

In response to telomere shortening, oxidative stress, DNA damage or aberrant activation of oncogenes, normal somatic cells exit the cell cycle and enter an irreversible growth arrest termed senescence. The limited proliferative capacity imposed by senescence on cells impedes the accumulation of mutations necessary for tumorigenesis and prevents proliferation of cells at risk of neoplastic trans...

The upregulation of endonuclease activities and subsequent decreases in the nucleic acid content leaves petals are characteristics senescence that allow for nutrient remobilization from dying organs. We previously identified a 43-kDa activity (PhNUC1) was upregulated Petunia × hybrida during senescence. PhNUC1 has optimal at neutral pH, is enhanced by Co2+, degrades both DNA RNA. peptide sequen...

Senescence is the last stage of leaf development and one type of programmed cell death that occurs in plants. The relationships among senescence programs that are induced by a variety of factors have been addressed at a molecular level in recent studies. Furthermore, an overlap between the pathogen-response and senescence programs is beginning to be characterized. The complexity of the senescen...

Senescence is a sequence of biochemical and physiological events that constitute the final stage of development. The identification of genes that alter senescence has practical value and is helpful in revealing pathways that influence senescence. However, the genetic mechanisms of senescence are largely unknown. The leaf of the oresara9 (ore9) mutant of Arabidopsis exhibits increased longevity ...

1. Senescence, the physiological decline that results in decreasing survival and/or reproduction with age, remains one of the most perplexing topics in biology. Most theories explaining the evolution of senescence (i.e. antagonistic pleiotropy, accumulation of mutations, disposable soma) were developed decades ago. Even though these theories have implicitly focused on unitary animals, they have...

Cellular senescence has emerged as a critical tumor suppressive mechanism in recent years, but relatively little is known about how senescence occurs. Here, we report that secreted Frizzled-related protein 1 (SFRP1), a secreted antagonist of Wnt signaling, is oversecreted upon cellular senescence caused by DNA damage or oxidative stress. SFRP1 is necessary for stress-induced senescence caused b...

Cytokines play several roles in developing and/or reinforcing premature cellular senescence of young cells. One such cytokine, interleukin-6 (IL-6), regulates senescence in some systems in addition to its known functions of immune regulation and promotion of tumorigenesis. In this review, we describe recent advances in studies on the roles of IL-6 and its downstream signal transducer and activa...