Potato: Germination of USDA Wild Potato Accessions

This post is not really meant to be read start to finish.  The intent is that it will be picked up by search engines so that breeders and researchers working with these accessions in the future can find this information.

We use accessions supplied by the USDA in some of our breeding work.  This report covers accessions of wild potatoes, supplied as true potato seeds.  We’re reporting germination percent after 30 days and speed of germination relative to S. tuberosum.  Seeds that had their first germination at least 3 days earlier than S. tuberosum are noted as fast and those that had their first germination at least 6 days later than S. tuberosum (when S. tuberosum germ had reached 50%) are noted as slow.  Accessions that germinated after the initial 30 day evaluation period are noted as very slow.

All seeds were started in sterile potting soil in individual cells.  Either 25 or 50 seeds were sown.  The seed starting room was heated to 65 degrees during the day and allowed to fall as low as 50 degrees at night.  Seeds were not treated with GA3.

Overall, germination was low compared to fresh seed of S. tuberosum, which reached 90% germination in 16 days. 19 accessions (18%) failed to germinate at all, although I am maintaining those cells in the hope that they might eventually germinate.  Where more than one accession was grown, results were fairly uniform by species.  That might indicate that our starting conditions weren’t in the right range for some of the species that didn’t germinate.  Bamberg (2018) reported that alternating temperatures inhibit germination in some species.  I wish that paper had been published a few months earlier!  We will retry the low or non germinating accessions for which we still have some seed at constant temperature to see if they do better.

Thanks to the USDA Potato Introduction Station for maintaining and providing these accessions.

Species PI Number Germination % Germination Time
S. acaule 205507 22 Slow
S. acaule 472665 34 Slow
S. acaule 561642 40 Slow
S. acaule 597688 28 Slow
S. acaule 597711 26 Slow
S. acroglossum 365313 36  
S. acroscopicum 230495 48  
S. agrimonifolium 243352 38  
S. agrimonifolium 545748 52  
S. albicans 498201 62 Slow
S. albicans 631199 66 Slow
S. albornozii 498206 8 Slow
S. andreanum 247360 28 Slow
S. andreanum 561631 16 Slow
S. berthaultii 217458 70  
S. berthaultii 265577 46  
S. berthaultii 310927 56  
S. boliviense 233125 40  
S. boliviense 435077 28 Slow
S. boliviense 597698 36 Slow
S. boliviense 597758 38  
S. brevicaule 205394 44  
S. brevicaule 265885 56  
S. brevicaule 275276 20 Slow
S. buesii 568922 8 Slow
S. bulbocastanum 243508 40  
S. burkartii 568985 16 Slow to very slow
S. cajamarquense 230522 12 Slow
S. candolleanum 246533 90 Fast
S. candolleanum 442697 98 Fast
S. candolleanum 458375 86 Fast
S. cardiophyllum 558041 94  
S. chacoense 265576 42  
S. chacoense 275142 28 Slow
S. chacoense 498321 36  
S. chacoense 558043 40  
S. chomatophilum 473460 44  
S. clarum 275202 20  
S. colombianum 561641 0  
S. colombianum 570615 0  
S. commersonii 243503 48  
S. commersonii 320266 44  
S. demissum 160208 40 Slow
S. demissum 186552 46  
S. dolichocremastrum 498234 20 Very slow
S. ehrenbergii 279303 0  
S. flahaultii 498166 8 Slow to very slow
S. gandarillasii 265866 0  
S. garcia-barrigae 498158 40  
S. guerreroense 161730 84  
S. hjertingii 251065 32 Slow
S. hougasii 558402 60  
S. huancabambense 458400 0  
S. hypacrarthrum 473477 4  
S. immite 498245 80 Fast
S. infundibuliforme 442675 0  
S. iopetallum 498021 68  
S. jamesii 275170 26  
S. jamesii 498407 34  
S. jamesii 592416 40 Fast
S. jamesii 595783 38 Fast
S. kurtzianum 133687 0  
S. laxissimum 473372 40  
S. lesteri 558434 44  
S. lignicaule 275273 12 Slow
S. limbaniense 473468 44  
S. lobbianum 567840 0  
S. longiconicum 186568 8 Slow
S. malmeanum 320269 0  
S. medians 458402 16  
S. microdontum 175150 76 Fast
S. minutifoliolum 583298 0  
S. mochiquense 283114 36  
S. morelliforme 243357 0  
S. morelliforme 619119 4 Very slow
S. multiinteruptum 265886 0  
S. neorossii 473202 28 Slow
S. okadae 458367 88  
S. okadae 498063 80  
S. oxycarpum 230479 0  
S. paucissectum 365340 0  
S. pinnatisectum 190115 0  
S. piurae 310997 4 Slow
S. polyadenium 175444 20  
S. raphanifolium 210048 36 Slow to very slow
S. schenkii 498250 40 Slow to very slow
S. sogarandinum 230510 16 Very slow
S. stenophyllidium 249927 16 Fast
S. stipuloideum 545974 40 Fast
S. stoloniferum 255547 70  
S. stoloniferum 558057 62  
S. tarnii 498043 56 Fast
S. trifidum 255539 28  
S. venturii 218220 76  
S. venturii 558146 70  
S. vernei 230468 68  
S. vernei 320332 62  
S. verrucosum 160228 100 Fast
S. verrucosum 251756 92 Fast
S. vioaceimarmoratum 258856 8 Slow
S. x aemulans 275132 30 Slow
S. x aemulans 500018 22 Slow
S. x blanco-galdosii 498214 0  
S. x doddsii 442690 28  
S. x michoacanum 653799 56 Fast
S. x rechei 558227 12  

 

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