Polyamines: Natural and engineered abiotic and biotic stress tolerance in plants

In vivo role ofArabidopsisarginase in arginine metabolism and abiotic stress response

“…5 Interestingly, AtARGAHs could modulate ROS accumulation and antioxidant enzyme activities under abiotic stress conditions, which is consistent with the results that both polyamines and NO play complex roles to deal with ROS derived from environmental stresses. 4,5,16,21 All these results may give new insights and evidences about crosstalk of NO and polyamines under abiotic stress conditions, and functional link between NO and polyamines metabolisms and ROS accumulation in vivo. 4,5,16,21 We hypothesized that NO and polyamines might share the same pathways to activate rapid stress responses in the plant.…”

“…Although changes of AtARGAHs expression had no significant effect on upstream ArticLe AddenduM the production of nitrogen species and reactive oxygen species (ROS). [6][7][8][9][10][11][13][14][15][16][17][18][19][20][21][22][23][24] Among multiple signaling molecules, NO and polyamines might be ideal candidates to integrate several environment stress responses, but the crosstalk of NO and polyamines is complex and needs to be further dissected. 1,4,17 As shown in Figure 1, manipulating the expression of AtARGAHs supplied a good version to investigate the link between NO and polyamines, especially in plant responses to abiotic stress.…”

“…[6][7][8][9][10][11]13,14 As to polyamines, overexpression of several polyamine metabolism genes including ADC and SPMS resulted in increased polyamines and enhanced abiotic stress tolerance, while knockdown of these genes had the opposite results. [16][17][18][19][20][21][22][23] In addition, exogenous polyamines treatment could abrogate the decreased abiotic stress tolerance in the polyamine-deficent mutant plants. [16][17][18][19][20][21][22][23] Consistently, we found that the knockout mutants and overexpression transgenic plants showed opposite abiotic stress responses and manipulation of arginase expression modulate both ADC and NOS pathway.…”

“…[16][17][18][19][20][21][22][23] In addition, exogenous polyamines treatment could abrogate the decreased abiotic stress tolerance in the polyamine-deficent mutant plants. [16][17][18][19][20][21][22][23] Consistently, we found that the knockout mutants and overexpression transgenic plants showed opposite abiotic stress responses and manipulation of arginase expression modulate both ADC and NOS pathway. 5 Interestingly, AtARGAHs could modulate ROS accumulation and antioxidant enzyme activities under abiotic stress conditions, which is consistent with the results that both polyamines and NO play complex roles to deal with ROS derived from environmental stresses.…”

Effects of Exogenous Putrescine on Mycorrhiza, Root System Architecture, and Physiological Traits of Glomus mosseae-Colonized Trifoliate Orange Seedlings

“…PAs in plants are involved in a variety of physiological and developmental processes, such as regulation of cell proliferation, somatic embryogenesis, flower and fruit development, replication, transcription, translation, membrane and cell wall stabilization, chromatin organization, ribosome biogenesis, and programmed cell death (Hussain et al, 2011). PAs also act as a mysterious modulator involved in plant responses to several stresses.…”