A protective role for the polyamine spermine against drought stress in Arabidopsis

Polyamines: potent modulators of plant responses to stress

“…It has also been reported that PAs including Spm inhibit stomatal opening and induce closure by regulating KAT1-like voltage-dependent inward K ' channels of Vicia faba guard cells (Liu et al 2000). Yamaguchi et al (2007) reported the protective role of Spm in salt stress which is also a consequence of altered concentration of Ca 2 ' . The increase in cytoplasmic Ca 2 ' restricts the entry of Na ' /K ' into cytoplasm, influx of Na ' /K ' to the vacuole or efflux of Na ' /K ' from the vacuole which in turn increases salt tolerance.…”

“…PAs could be exploited for improving stress tolerance in moderately drought tolerant plants (Davies 2004). PAs has also been reported to play important role in plant drought tolerance (Nayyar et al 2005;Yang et al 2007;Yamaguchi et al 2007). Yiu et al (2009) reported that exogenous application of Put reduced the flooding-induced oxidative damage in Allium fistulum by increasing the antioxidant capacity as evident from substantially reduced superoxide radical O À 2 ð Þ, H 2 O 2 , and malondialdehyde (MDA) contents and membrane permeability.…”

“…It was suggested that a higher level of free Put at an early stage of stress and insoluble-conjugated Put during the whole stress period helped the plants to adapt the drought conditions. In addition, Yamaguchi et al (2007) reported the protective role of Spm against drought stress in Arabidopsis. Arabidopsis double mutant plant (acl5/spms), which cannot produce Spm, is hypersenisitive to drought stress.…”

“…It has been illustrated that PAs are also involved in a wide range of abiotic stresses like salinity (Shevyakova et al 2006); drought (Yamaguchi et al 2007); chilling (Hausman et al 2000;Nayyar et al 2005); oxidative stress (Ye et al 1997); metal toxicity (Shevyakova et al 2010) and paraquat (PQ) (Benavides et al 2000;Soar et al 2003). The stress protective properties of PAs indicate that accumulation of PAs in plants in response to abiotic stress is an integral component of plant strategy to cope with various abiotic stresses.…”

In vivo role ofArabidopsisarginase in arginine metabolism and abiotic stress response

“…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.…”