The SPEECHLESS-induced stomatal increase is required for the salt tolerance of oil palm
Song, Z.; Wang, L.; Lai, C. C.; Yang, Z.; Lee, M.; Yue, G.
Show abstract
Oil palm is the most productive oil producing plant. Salt stress leads to growth damage and decrease in yield of oil palm. However, the physiological responses of oil palm to salt stress and their underlying mechanisms are not clear. RNA-Seq for leaf samples from young palms challenged under three levels of salts (100, 250 and 500 mM NaCl) and control for 14 days was conducted. Diverse signalling pathways were involved in responses to different levels of salt stress. All the three levels of salt stress activated EgSPCH expression and induced stomatal density of oil palm, which was contrasting to that in Arabidopsis. Under strong salt stress group, oil palm removed excessive salt via stomata. Overexpression of EgSPCH in Arabidopsis increased the stomatal production but lowered the salt tolerance. These data suggest that in oil palm, salt activates EgSPCH to generate more stomata in response to salt stress. Our results shed a light on the cellular response to salt stress of oil palm and provide new insights into the mechanisms of different salt-induced stomatal development between halophytes and glycophytes.
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