Guys, the thing is - there's no explicit statement either way.
No, Spontaneous Healer doesn't have a line that says "this ability can be used despite the restrictions in Arcane Disciple" - but then,how many feats DO reference limitations in other feats, that way?
None, that I can think of right now.
But, let's really look at the sentence in question, shall we? It says:
[bq] Each day, you may prepare (or cast, if you cast spells withoutpreparation) a maximum of one of these domains spells of each level.[/bq]
So. What is this actually saying to us ... ?
One, if you prepare spells each day, you may only prepare one spell of each spell level, per day, from the domain(s) you have gained access to.
Two, if you cast spells without preparation, you may only cast one spell of each spell level, per day, from the domain(s) you have gained access to.
That's all well and fine - using Arcane Disciple, you may only cast/prepare one spell of each spell level form the domain selected. No problems there, right?
Now, enter Spontaneous Healer. As a seperate ability, you can exchange a prepared spell in order to spontaneous cure wounds spell, a number of times per day equal to your Wisdom modifier - regardless of spell level.
Well; absent an explicit statement to the contrary, we should look at the impact of allowing full interaction between these two feats in terms of game balance.
So. In the event that a Wizard has a wisdom of, say, 14 or 16, and both the Arcane Disciple and Spontaneous Healer feats ... is it really that unbalanced to allow her to convert prepared spells into 2 or 3 additional cure spells per day?
If our wizard is 17th+ level, the'yre getting nine curative spells per day. Is three more that big a deal? Really?
I just don't think so; I don't see the problem with permittingit, and IMO, it's a very creative, party-supportive use of two feats.