Abstract
The effect of treatment of potato seed tubers withPseudomonas putida isolate WCS358 on tuber yield was studied in different crop rotations at the Experimental Farm ‘De Schreef’, near Lelystad. With untreated, tuber yield in a 1:3 (short) rotation compared to yield in a 1:6 (long) rotation of potato was decreased by 11% at 86 days (seed tuber harvest) and by 14% at 130 days (ware potato harvest) after seeding. Seed tuber treatment with the wild-type isolate WCS358 increased tuber yield with 13% in a short rotation of potato 86 days after seeding, whereas a siderophore-negative Tn5 transposon mutant of this isolate had no effect on tuber yield. Seed tuber treatment with the wild-type isolate or the siderophore-negative mutant in a long rotation of potato had no effect on tuber yield. At 130 days after seeding no effect of any of the seed tuber treatments was found in both short and long rotations of potato.
Root colonization by siderophore-producing Tn5 transposon mutants of WCS358 was decreased at the end of the growing season. No difference in root colonization between siderophore-producing and siderophore-negative Tn5 transposon mutants was found at 130 days after seeding.
Siderophore production seems to be a prerequisite in potato tuber yield increase by WCS358 under field conditions. This is the first time that the involvement of siderophores in growth stimulation has been demonstrated in the field.
Samenvatting
De invloed van een behandeling van aardappelpootgoed metPseudomonas putida isolaat WCS358 op de knolopbrengst werd onderzocht in verschillende gewasrotaties on een proefveld van proefboerderij ‘De Schreef’, Flevopolder. In de controlebehandelingen werd in een nauwe aardappelrotatie (1:3) een reductie van 11% in opbrengst van pootaardappelen (86 dagen na het poten) geconstateerd ten opzichte van een ruime aardappelrotatie (1:6); 130 dagen na het poten werd een vermindering met 14% gevonden in de opbrengst van consumptieaardappelen.
Pootgoedbehandeling met het siderofoorproducerende isolaat WCS358 verhoogde de opbrengst van pootaardappelen in de 1:3-rotatie met 13%. Een Tn5-transposonmutant van dit isolaat die het vermogen sideroforen te produceren had verloren, had geen effect op de opbrengst. In de 1:6-rotatie had behandeling van pootgoed met WCS358 geen effect op de opbrengst van pootaardappelen.
Zowel in de nauwe (1:3) als in de ruimte (1:6) rotatie werd (130 dagen na het poten), geen effect van behandeling van pootgoed met WCS358 op de opbrengst van consumptieaardappelen gevonden.
Wortelkolonisatie door siderofoorproducerende Tn5-transposonmutanten van WCS358 nam aan het eind van het seizoen af. Er werd, 130 dagen na het poten, geen verschil in wortelkolonisatie geconstateerd tussen siderofoorproducerende en siderofoornegatieve Tn5-transposonmutanten.
Siderofoorproduktie blijkt een voorwaarde te zijn voor verhoging van de knolopbrengst door WCS358 onder veldomstandigheden. De verhoging van de knolopbrengst treedt alleen op in de nauwe aardappelrotatie. Dit is de eerste keer dat de betrokkenheid van sideroforen bij groeistimulatie onder veldomstandigheden is aangetoond.
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Bakker, P.A.H.M., Lamers, J.G., Bakker, A.W. et al. The role of siderophores in potato tuber yield increase by Pseudomonas putida in a short rotation of potato. Netherlands Journal of Plant Pathology 92, 249–256 (1986). https://doi.org/10.1007/BF01977588
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DOI: https://doi.org/10.1007/BF01977588