1103 Paulsen is a V. berlandieri x V. rupestris hybrid used as a rootstock. Dr Richard Smart (2015, p.628) says it was ‘bred in 1896 by Federico Paulsen, the director of an American vine nursery in Sicily. It is regarded as a drought-tolerant rootstock with high phylloxera tolerance and moderate nematode resistance. Lime tolerance is intermediate [well adapted to clay-limestone soils], and vigour moderate to high [suited to low fertility sites, tolerates excess humidity]. It is welcomed by nurserymen as being easy to graft and root.’ It is also somewhat tolerant of salinity.
Dr Richard Smart in the Oxford Companion to Wine 4th edition ed. Jancis Robinson MW and Julia Harding MW (Oxford University Press, 2015, p.628.