chlorophyllase


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chlorophyllase

[′klȯr·ə·fə‚lās]
(biochemistry)
An enzyme that splits or hydrolyzes chlorophyll.
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The reduction in chlorophyll b content observed in plants of the control treatment (0 [micro]M) may be attributed to the increase in the activity of the chlorophyllase enzyme, which degrades molecules of this photosynthesizing pigment (Freire et al., 2013).
The decrease in the content of chlorophyll a in the plants subjected to water salinity might be attributed to the increase in the activity of the chlorophyllase enzyme, which degrades the chlorophyll, since the salt stress induces the degradation of the [beta]-carotene and the reduction in the formation of zeaxanthin, producing a decrease in the content of carotenoids, pigments apparently involved in the protection against photoinhibition (Freire et al., 2013).
Limitation in the amount of photosynthetic pigments observed in our study is one of the various effects of salt stress in plants and it has been found in many crops (Saqib et al, 2012), the reduced chlorophylls in salinity stressed plants might be attributed to the increase in the activities of the chlorophyll-degrading enzymes, chlorophyllase and the decrease in carotenoid contents under salt stress leads to degradation of [beta]-carotene.
Moreover, many scientists also suggested that the decrease in chlorophyll levels may possibly be the results of some kind of inhibition of chlorophyll synthesis, together with the increased activity of chlorophyll degrading enzyme chlorophyllase (SANTOS, 2004).
At the beginning of fermentation in fresh, nonacidified brines, the pH is neutral, allowing the enzymatic conversion of chlorophyll to chlorophyllide by chlorophyllase to dominate the degradation reactions.
Metal toxicity degrades the chlorophyll synthesizing substance and hinders the chlorophyllase activity by Cr metal (59).
Jez, "Mechanistic analysis of wheat chlorophyllase," Archives of Biochemistry and Biophysics, vol.
Biosynthesis of several proteolytic enzymes was reported in saline conditions such as chlorophyllase which may be responsible for the disintegration of chlorophyll (Parida and Das, 2005).
The reduction of chlorophyll a and b amounts with NaCl application maybe due to increased activity of destructive enzymes called chlorophyllase [57,8,55,56].
The reduction in the concentration of chlorophyll might have also been caused by the increase in chlorophyllase enzyme activities, which, in turn, affects the chlorophyll concentration in plants [29].