TOKYO, Oct 7 (Reuters) - Japanese stocks on Wednesday tracked Wall Street lower, as economic uncertainty resurfaced after U.S. President Donald Trump halted negotiations for additional stimulus to aid the coronavirus-battered economy until after the election. Concerns that the lack of stimulus could further delay recovery of the world’s largest economy dampened global investor sentiment. The benchmark Nikkei share average fell 0.13% to 23,402.83 by the midday break, while the broader Topix lost 0.06% to 1,644.71. Nearly two-thirds of 33 sector sub-indexes on the Tokyo exchange traded in the red, with pharmaceuticals, land transport and fisheries and forestry leading the decliners on the main bourse. Prospects for additional U.S. coronavirus bill crumbled after President Trump announced on Twitter that he was calling off negotiations with Democratic lawmakers on coronavirus relief legislation until after the election. Back home, Boeing-related shares Mitsubishi Heavy Industries and Kawasaki Heavy Industries dropped more than 1% each, in line with their U.S. peers as Boeing Co cut its rolling 20-year forecast for airplane demand on the coronavirus crisis. Yakult Honsha Co slipped 6.44% after French food group Danone said it would sell its remaining 500 million euro ($586.60 million) stake in the Japanese probiotic yogurt maker. Elsewhere, Fujitsu inched up 0.04%, Nippon Telegraph and Telephone Corp jumped 3.4%, while Fanuc edged 0.15% lower after the three firms said they would set up cloud service joint venture for manufacturing companies. Bucking the sombre mood, the Mothers Index of start-up firms rose 1.18%. ($1 = 0.8524 euros)