The Formation Of Acc And Its Conversion Into Ethylene

1048 WordsNov 30, 20165 Pages
The evolution of ACC also brings about the production of 5¢-methylthioadenosine-nine. Increase in the rate of respiration of the fruit gives ATP (Adenosine triphosphate) need for the methionine cycle and can lead to induced ethylene production without high levels of intracellular methionine. SAM is a crucial methyl giver and relates to numerous aspects of cellular metabolism. Thus, the two steps involved in the synthesis of ethylene is the formation of ACC and its conversion into ethylene. The genes encoding ACS and ACO have therefore been studied more deeply than other enzymes in the pathway, although there is proof that a few other genes concerned with methionine synthesis and methionine salvage pathway are differentially demonstrated throughout ripening and in response to ethylene (Alba and others 2005; Zegzouti and others 1999). ACS and ACO are encoded by multigene families in higher plants, with tomato having at most nine ACS (LEACS1A, LEACS1B, and LEACS2-8) and five ACO (LEACO1-5) genes (Barry and others 1996; Nakatsuka and others 1998; Oetiker and others 1997; Van-der-Hoeven and others 2002; Zarembinski and Theologis 1994). Expression survey has disclosed that at least four ACS (LEACS1A, LEACS2, LEACS4, LEACS6) and three ACO (LEACO1, LEACO3, LEACO4) genes are differentially shown in tomato fruit (Barry and others 1996, 2000; Nakatsuka and others 1998; Rottmann and others 1991). LEACO1, LEACO3, andLEACO4 are shown at low levels in green fruits that are in the first

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