NtLTP4, a lipid transfer protein that enhances salt and drought stresses tolerance in Nicotiana tabacum.

ABSTRACT: Lipid transfer proteins (LTPs), a class of small, ubiquitous proteins, play critical roles in various environmental stresses. However, their precise biological functions remain unknown. Here we isolated an extracellular matrix-localised LTP, NtLTP4, from Nicotiana tabacum. The overexpression of NtLTP4 in N. tabacum enhanced resistance to salt and drought stresses. Upon exposure to high salinity, NtLTP4-overexpressing lines (OE lines) accumulated low Na⁺ levels. Salt-responsive genes, including Na⁺/H⁺ exchangers (NHX1) and high-affinity K⁺ transporter1 (HKT1), were dramatically higher in OE lines than in wild-type lines. NtLTP4 might regulate transcription levels of NHX1 and HKT1 to alleviate the toxicity of Na⁺. Interestingly, OE lines

SUBMITTER: Xu Y 

PROVIDER: S-EPMC5995848 | biostudies-literature | 2018 Jun

REPOSITORIES: biostudies-literature