No, there are no tax implications for spouses transferring money.
However, do be aware that US banks are required to report transactions over $10,000 to the IRS. This is mainly a defense against money laundering, and it is very unlikely that anyone will look into transfers that you make for legitimate purposes. But, if you structure your transfers so that you make many small transfers instead of one large transfer, for the purpose of avoiding the reporting limit, that can sometimes constitute a separate financial crime called "Structuring." So just do your business normally and don't try to get clever.
