PO:0025276 shoot procambium A portion of procambium (PO:0025275) tissue that is part of a shoot system (PO:0009006). PMID 15037450 KRP4 TAIR locus:2046427 PMID 15037450 ICK3 TAIR locus:2087248 PMID 16357038 WOL TAIR locus:2059718