Diyarbakir 6th High Criminal Court refected acquittal demands of 151 Kurdish politicians and adjourned until tomorrow.
Turkey on Monday began trying 151 politicians and activists, including 12 elected mayors, charged with links to KCK.
The defendants are accused of crimes including undermining Turkey's territorial integrity and violating laws on public demonstrations, according to a 7,500-page indictment.
On the first day of the trial lawyers demanded the acquittal of all suspects who face between five years to life in prison.
The judges rejected the demands and adjourned until tomorrow.
The defendants insisted on defending themselves in the Kurdish language as an expression of Kurdish identity. "The defense in mother tongue is a natural right, we want to use this right" Hatip Dicle, one of the suspects, told reporters during a break.
The court was considering the suspects' request, but was likely to reject it.