Words similar to senescence
Example sentences for: senescence
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It is possible that the higher expression levels observed during stem and leaf senescence are due to suppression of photosynthesis activity.
We used ozone as an abiotic stressor because the plant's response at the biochemical and molecular level shows extensive overlap with the pathogen defense response and includes the production of ROS, as well as induction of HR and SAR [ 23 24 ] . At the phenotypic level, acute ozone exposure (high dose for a short interval) causes necrotic lesions similar to those caused by avirulent pathogen infections, whereas chronic ozone exposure (low dose for an extended period of time) accelerates foliar senescence, producing similar symptoms to those caused by virulent pathogen infections [ 25 26 ] . There is evidence that elicitor-evoked ROS production, called the oxidative burst, is an essential signaling component of the defense response [ 27 ] . Moreover ozone is a component of photochemical smog and itself represents an oxidative stress to living organisms, damaging crops and forests [ 28 ] .
The existence of placental aging is still debated, yet various clinical, morphological, cellular and molecular aspects of placental senescence have been indicated [ 20 21 24 25 27 28 29 30 45 46 47 ] . However, it is still unclear if there are any consequences of placental aging for normal pregnancy, delivery, and neonatal birth weight and Apgar scores [ 29 48 49 ] . It has to be noted that even the abnormal placenta may have the capacity to improve its function and compensate for demands of the growing fetus, e.g., by elongation and excessive dilatation of villous sinusoids [ 26 50 ] .
During senescence, the light sensitivity of stem and leaf is biochemically reduced.
During the last trimester of human pregnancy, the placenta may exhibit pronounced abnormality associated with generalized villous degeneration, often called placental aging or senescence [ 22 23 24 27 43 44 45 ] . We have recently shown that placental abnormality is associated with the diminution of Thy-1 differentiation protein immunostaining in the villous core and less or more pronounced dilatation of villous sinusoids.
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