Improved manufacturing data from China on Wednesday suggested its downturn may be bottoming out, but plunging U.S. auto sales underscored the depth of the recession in the world's biggest economy. China's official purchasing managers' index (PMI) for January rose to 45.3, up from 41.2 in December and a record low of 38.8 plumbed in November. The January PMI data at least provide further support to our view that GDP growth should be stronger in Q1 2009 than in Q4 2008," said Mingchun Sun, an economist with Nomura in Hong Kong, in a note. "China's GDP growth will be V-shaped in...