A preprogrammed process associated with the dismantling of an anatomical structure and an overall decline in metabolism. This may include the breakdown of organelles, membranes and other cellular components. An example of this process is found in Arabidopsis thaliana, when older leaves or floral organs are shed.
Organism
Arabidopsis thaliana
Click Gene ID to show a list of co-expressed genes.
Senescence associated gene (SAG). Expression induced by ozone. Encodes a plant-specific protein of unknown function. Based on a personal communication from David Meinke (08/21/2007), this gene is not allelic to TTN4, even though this has been stated previously in a publication.
Autophagy protein ATG5. Forms a conjugate with ATG12 with an essential role in plant nutrient recycling. Mutants missing ATG5 display early senescence and are hypersensitive to nitrogen or carbon starvation, accompanied by a more rapid loss of organellar and cytoplasmic proteins.
Has acid phosphatase activity dependent on the presence of divalent cations (Mg2+, Co2+, Zn2+, Mn2+) and anti-insect activity. Insects fed with the protein show a retarded development. Induced in response to abscisic acid, jasmonic acid, salt, water deficiency and wounding.
ATNAC6 (ARABIDOPSIS NAC DOMAIN CONTAINING PROTEIN 6)
Encodes a NAC-domain transcription factor. Positively regulates aging-induced cell death and senescence in leaves. This gene is upregulated in response to salt stress in wildtype as well as NTHK1 transgenic lines although in the latter case the induction was drastically reduced. It was also upregulated by ABA, ACC and NAA treatment, although in the latter two cases, the induction occurred relatively late when compared with NaCl or ABA treatments. Note: this protein (AtNAC6) on occasion has also been referred to as AtNAC2, not to be confused with the AtNAC2 found at locus AT3G15510.
The inherent decline over time, from the optimal fertility and viability of early maturity, that may precede death and may be preceded by other indications, such as sterility.
The process that occurs in an organ near the end of its active life that is associated with the dismantling of cell components and membranes, and an overall decline in metabolism. An example of this process is found in Arabidopsis thaliana.
