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Comparison of endogenous cytokinins, ABA and metabolites during female cone bud differentiation in low and high cone-producing genotypes of lodgepole pine

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Abstract

In lodgepole pine (Pinus contorta Dougl. ex Loud. var. latifolia Engelm.), cone bud initiation within long-shoot buds varies according to genotype. We chose to study hormone profiles of two genotypes that differed significantly in cone yield. Phytohormone profiles were established by high performance liquid chromatography–electrospray ionization tandem mass spectrometry in multiple reaction monitoring mode with samples collected from genotypes 299 and 233, the typically high and low cone producers. Generally, concentrations of trans-zeatin-O-glucoside were higher in genotype 299, whereas dihydrozeatin concentrations were higher in genotype 233. Both isopentenyl adenine and isopentenyl adenosine were present at higher concentrations in genotype 233. The ratio of total quantifiable zeatin (Z)-type cytokinins to isopentenyl (iP)-type cytokinins was approximately threefold higher in genotype 299 during female cone bud differentiation. In genotype 299, ABA concentration was significantly lower than in genotype 233 on the first sampling date, while the phaseic acid concentration was lower consistently throughout the period investigated. Dihydrophaseic acid was present in low concentrations in most samples of genotype 233, but was not quantifiable in genotype 299. Our study reveals that long-shoot buds of the high cone-producing genotype had higher ratios of Z-type cytokinins to iP-type cytokinins than were found in the low cone-producing genotype. High cone-producing buds also contained less ABA, phaseic acid and dihydrophaseic acid during female cone bud differentiation.

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Abbreviations

HPLC–ESI–MS/MS:

High performance liquid chromatography–electrospray ionization tandem mass spectrometry

MRM:

Multiple reaction monitoring

GA:

Gibberellin

ABA:

Abscisic acid

PA:

Phaseic acid

DPA:

Dihydrophaseic acid

7′-OH ABA:

7′-Hydroxy ABA

neoPA:

Neophaseic acid

ABA-GE:

Abscisic acid glucose ester

t-Z:

Trans-zeatin

t-ZR:

Trans-zeatin riboside

t-Z-O-Glu:

Trans-zeatin-O-glucoside

dhZ:

Dihydrozeatin

dhZR:

Dihydrozeatin riboside

iP:

Isopentenyl

2iP:

Isopentenyl adenine

iPA:

Isopentenyl adenosine

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Acknowledgments

This work was supported by grants from the British Columbia Forest Investment Account, Forest Genetics Conservation and Management Program and the Natural Sciences and Engineering Research Council of Canada Discovery Program (PvA). The authors would like to express great appreciation to the project steering committee of cone induction and the following individuals for their help in this study: Jack Woods (FGCBC and SelectSeed Co. Ltd.), Tim Lee and Dan Gaudet (Vernon Seed Orchard Company) and, Samir Demdoum, Sébastien Bonthoux and Genoa Barchet (University of Victoria). The authors also wish to thank the following members of the Hormone Profiling Lab at NRC-PBI: Monika Lafond and Vera Čekić for the preparation of standard solutions and for the extraction and work-up of all samples for analysis, and Dr. Irina Zaharia for her assistance in this work.

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Correspondence to Lisheng Kong.

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Communicated by R. Aloni.

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Kong, L., von Aderkas, P., Owen, S.J. et al. Comparison of endogenous cytokinins, ABA and metabolites during female cone bud differentiation in low and high cone-producing genotypes of lodgepole pine. Trees 25, 1103–1110 (2011). https://doi.org/10.1007/s00468-011-0585-3

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