RT Journal Article
SR Electronic
T1 Cold acclimation and deacclimation of <em>Ptelea</em> and <em>Zanthoxylum</em> (Rutaceae)
JF Native Plants Journal
JO NATIVE PLANTS JOURNAL
FD University of Wisconsin Press
SP 215
OP 224
DO 10.3368/npj.24.3.215
VO 24
IS 3
A1 Stewart, Anna J Talcott
A1 Arora, Rajeev
A1 Graves, William R
YR 2023
UL http://npj.uwpress.org/content/24/3/215.abstract
AB The North American genera Ptelea L. and Zanthoxylum L. are distributed farther north than most other genera in the Rutaceae (citrus family). We used 3 methods to characterize cold acclimation and deacclimation of common hoptree (Ptelea trifoliata L.) and common pricklyash (Zanthoxylum americanum Mill.), species with potential to diversify landscapes. Female and male common hoptrees were compared, and we contextualized our results by measuring cold hardiness of western hoptree (Ptelea crenulata Greene) and representatives of other woody genera of the order Sapindales that are hardy in the Upper Midwestern US: maple (Acer L.), ailanthus (Ailanthus Desf.), corktree (Phellodendron Rupr.), and sumac (Rhus L.). A discoloration method was ineffective, so we assessed hardiness based on electrolyte leakage and the reduction of 2,3,5-triphenyltetrazolium chloride (TTC). TTC reduction indicated that Ptelea and Zanthoxylum were more cold-hardy than indicated by electrolyte leakage. Western hoptree, sampled in its native habitat, was the least hardy. Maximal hardiness of common hoptree, common pricklyash, and western hoptree was –42, –33, and –21 °C (–44, –27, and –6 °F), respectively. Hardiness of female and male common hoptrees did not differ consistently. While common hoptree and common pricklyash have been considered hardy to Zone 3, our assessments of plants from a portion of the species’ geographic ranges indicate common hoptree is the more cold-hardy species.