Citrus fruit originated in Southeast Asia?

A recent paper published online in Nature reported on the origins of today's citrus fruits, providing a new evolutionary framework for this group of common plants that challenge current taxonomic thinking.
citrus fruit trees are the most widely grown in the world, but their origin and history have not been clear.
in this study, Guohong Wu of the U.S. Department of Energy's Joint Genomics Institute and colleagues analyzed the genomes of 60 different citrus varieties, including Australian finger lime and orange, 30 of which were newly sequenced. Today's citrus fruit trees originate from at least 10 natural citrus species,
researchers report.
in the late Mesozoties 6-8 million years ago, citrus diverged and quickly spread in Southeast Asia, a shift associated with the weakening of the Asian summer monsoon.
The Australian citrus began to diverge later, crossing the Wallace Line, the transition zone between Asia and Australia, about 4 million years ago.
authors also studied the domestication of wild citrus, suggesting that the grapefruit gene may also contribute to oranges.
.