In this speech, Truman focused strongly on how badly Greece had been hurt by WWII and how much it needed aid for itself. He did not say the same about Turkey. He noted that Turkey had not been devastated to the degree Greece had and that it had gotten aid from both the US and Great Britain.
Turkey's importance, to Truman, was due to the fact that it was influential among the newly independent nations of the Middle East. Truman argues that Turkey needed aid to modernize (not just to stay "alive") so as to maintain its "national integrity." This integrity was important because it was "essential to the preservation of order in the Middle East."
So, Truman argues for aid to Turkey based more on its regional influence than on its own need to resist communism.