Besides
these commonly studied mechanisms, PGPE are also beneficial to
plant growth due to their production of the enzyme 1-aminocyclopropane-1-carboxylic acid (ACC) deaminase, that converts
ACC, the precursor of ethylene in plants, into ammonia and
a-ketobutyrate, thereby lowering plant ethylene levels and
enhance plant growth (Rashid et al., 2012; Glick, 2014). Inoculation
of various plants with ACC deaminase-producing PGPE had been
reported and these studies indicated that bacteria having ACC
deaminase activity reduce the level of ethylene stress conferring
resistance and resulting in better growth of plants under various
stress environments (Kuffner et al., 2010; Khan et al., 2011; Jha
et al., 2012). To date, however, scarce study has been made
specially to screen actinobacteria for their potential to produce
ACC deaminase and to enhance plant growth.
Besidesthese commonly studied mechanisms, PGPE are also beneficial toplant growth due to their production of the enzyme 1-aminocyclopropane-1-carboxylic acid (ACC) deaminase, that convertsACC, the precursor of ethylene in plants, into ammonia anda-ketobutyrate, thereby lowering plant ethylene levels andenhance plant growth (Rashid et al., 2012; Glick, 2014). Inoculationof various plants with ACC deaminase-producing PGPE had beenreported and these studies indicated that bacteria having ACCdeaminase activity reduce the level of ethylene stress conferringresistance and resulting in better growth of plants under variousstress environments (Kuffner et al., 2010; Khan et al., 2011; Jhaet al., 2012). To date, however, scarce study has been madespecially to screen actinobacteria for their potential to produceACC deaminase and to enhance plant growth.
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