A Transcriptomic Analysis of Stylo [Stylosanthes guianensis (Aubl.) Sw.] Provides Novel Insights Into the Basis of Salinity Tolerance

Tropical areas have a large distribution of saline soils and tidal flats with high salinity level. Salinity stress is key factor limiting the widespread use tropical forage such as Stylosanthes guianensis (Aubl.) Sw. This study was designed to screen tolerance 84 S. accessions; In greenhouse experiment, plants were subjected Hoagland solution or 200 mM NaCl for up 15 days. tolerant accession CIAT11365 sensitive FM05-2 obtained based on withered leaf rate (WLR). Further verification in different gradients showed that increased WLR decreased relative chlorophyll content (SPAD), maximum photochemical efficiency photosystem II (Fv/Fm), photosynthetic (Pn) FM05-2, but exhibited lower higher SPAD, Fv/Fm, Pn. Leaf RNA-Seq revealed Ca 2+ signal transduction Na + transport ability, tolerance-related transcription factors antioxidant an increase auxin, inhibition cytokinin may play roles response stress. The results this contribute our understanding molecular mechanism underlying responses also provide important clues further in-depth characterization resistance breeding candidate genes .