? Greek political party talks on the formation of a coalition government ended fruitless on Sunday.

? Papoulias is due to hold one-on-one meetings with the leaders of the other four parties.

? Opinion survey: no party would win absolute parliamentary majority to rule the debt-laden country.

(From L to R) Greek socialist party PASOK leader Evangelos Venizelos, Conservative New Democracy leader Antonis Samaras, Greek President Karolos Papoulias and leader of Greece's radical leftist SYRIZA coalition Alexis Tsipras meet at the Presidential Palace in Athens, Greece, May 13, 2012. (Xinhua/Marios Lolos)

The first round of talks between Greek political party leaders chaired by President Karolos Papoulias on the formation of a coalition government ended fruitless on Sunday, but the dialogue will continue in the evening, local media reported.

In a final bid to form a national unity administration to lead Greece after the May 6 general elections produced no clear winners and avoid a second round of polls, Papoulias summoned the leaders of the three top ranking parties in the first round of polls who failed to reach an agreement over the past week.

But once again, no deal was clinched during the meeting between conservative New Democracy (ND) party chief Antonis Samaras, Radical Left Coalition SYRIZA head Alexis Tsipras and socialist PASOK party leader Evangelos Venizelos.

Leaving the Presidential mansion in central Athens, Samaras told reporters that "deliberations will continue," while Venizelos said that he remained "cautiously optimistic" as he addressed a meeting of PASOK members a few minutes later.

Papoulias is due to hold one-on-one meetings with the leaders of the other four parties that entered the new legislature, starting with Rightist Independent Greeks leader Panos Kammenos on Sunday evening and continuing with Greek Communist Party General Secretary.

This round of talks will finish with the meetings with Nikos Michaloliakos, the leader of the neo-fascist Chryssi Avgi, or Golden Dawn, party that made it for first time in the Greek assembly, and Fotis Kouvelis, chief of the Democratic Left party which is regarded as a likely coalition partner in a new administration.

Kouvelis has suggested to form a national unity government with a two-year term which is aimed to keep Greece in the eurozone and renegotiate with EU and International Monetary Fund lenders some tough austerity terms of two bailout loans agreements clinched since 2010 to avert a Greek bankruptcy.

ND and PASOK leaders back the plan, but SYRIZA insists on a clear anti-austerity agenda before joining any coalition.

If the last round of talks under the President concludes with no deal clinched, according to the Greek Constitution, Papoulias will appoint the president of the Supreme Court, Council of State or Court of Audit as prime minister of a caretaker administration that will lead the country to new elections in June.

According to the latest opinion survey printed on Sunday in local newspaper "To Vima" (The Tribune), still no party would win absolute parliamentary majority to rule the debt-laden country in the new elections.

SYRIZA is expected to top the fresh polls with 20.5% of votes up from 17% in the May 6 elections, and ND is forecast to rank second with 18.1%, slightly down from the 18.9% it secured last Sunday. All other parties will have reduced percentages, according to projections.

Close to 80% of the 1,007 persons who responded in the survey wished for the formation of any administration that would safeguard Greece's eurozone membership, the survey showed.