TOKYO, Sept 22 (Reuters) - Nissan Motor Co. , Japan's second-biggest car maker, said on Thursday its chief executive Carlos Ghosn would hold a media roundtable to update its "180" business plan at 4 p.m. (0700 GMT). Under the plan, Nissan, 44 percent owned by France's Renault SA , had promised to boost global sales by 1 million vehicles from fiscal 2001 levels to 3.6 million in the 12 months through the end of this month.