The government is working on rolling out reform measures to attract foreign investment in four key sectors -- nuclear energy, defence, insurance and plantation and agriculture --by the year-end, for many of which legislations are already lined up in the upcoming winter session of Parliament. ET has reliably gathered that these measures are drawn from proposals by a high-powered Niti Aayog panel, which has favoured FDI through the government route in the proposed new regulatory framework for atomic energy.