https://qteller.maizegdb.org/ maintained by Freeling Lab is an excellent resource to take a quick look at some of the public expression datasets available for some plant species. It hosts gene expression datasets for five plant species, namely Arabidopsis, rice, maize, Sorghum, and moss. I use this tool often to take a quick look at the exspression of a gene or a set of genes to confirm or clarify the expression patterns.
Drag and drop the red link onto the bookmarks bar
Downloading Qteller data using the bookmarklet
Once you navigate to the qTeller Visualize Expression page such as this, you can click on the bookmarklet to download the qTeller data as a csv file. The file name will be
qteller_maizegdb.csv. You can search for a new gene and click the bookmarklet and it will download the data for the currently searched gene.