These are resources I m using frequently in my research and thought will be useful for others as well. 

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Araport11: To analyze Arabidopsis thaliana genes, proteins, gene expression, protein-protein interactions, orthologs, and more. Click here and for genome browser click here

Arabidopsis single cell database: Root click here and leaf click here

Phytozome: Click here

Plaza: To access genomic data produced by different genome sequencing initiatives. Click here

eHALOPH: A database of halophytes and other salt tolerant plants. Click here

Schrenkiella parvula genomic data BLAST tool: Click here

TimeTree:  A public knowledge-base for information on the evolutionary timescale of life. Click here