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- Title
Effects of stem-injected gibberellins and 6-benzylaminopurine on phytohormone profiles and cone yield in two lodgepole pine genotypes.
- Authors
Kong, Lisheng; von Aderkas, Patrick; Zaharia, L. Irina
- Abstract
Key message: Stem-injection of plant growth regulators into ramets of two lodgepole pine genotypes altered endogenous phytohormones and metabolites in long-shoot buds, and in one of the genotypes, dramatically increased female cone yield.Abstract: Effects of exogenously applied gibberellins (GAs) and 6-benzylaminopurine (BA) on profiles of phytohormones and some of their metabolites relative to controls in long-shoot buds of lodgepole pine (<italic>Pinus contorta</italic> Dougl. ex Loud. var. <italic>latifolia</italic> Engelm.) were analyzed during cone bud initiation and differentiation. Differential responses in phytohormones and in cone yield were observed in ramets of the two tested genotypes (478 and 276) to stem-injected mixtures of GA4 and GA7 (GA4/7) and /or BA. Injected GA4/7 affected bud concentrations of GA4 and GA7. Injected PGRs, with the exception of BA injection, decreased concentrations of abscisic acid (ABA) and ABA glucose-ester at week 5 and/or week 7. Internal concentrations of <italic>trans</italic>-zeatin riboside (<italic>t</italic>-ZR) increased in response to all treatments at week 3 in genotype 276. In genotype 478, <italic>t</italic>-ZR only increased with treatments of BA or GA4/7 plus BA. Dihydrozeatin riboside concentrations increased in response to GA4/7 plus BA treatment at week 7 in genotype 276. Concentrations of isopentenyl adenosine declined with treatments of GA4/7 and GA4/7 plus BA in genotype 276 at week 5. In genotype 478, a similar decrease was caused by GA4/7 plus BA treatment. For both genotypes, the highest ratio of zeatin-type cytokinins to isopentenyl-type cytokinins occurred at weeks 5 and 7 after injection with GA4/7 plus BA. Stem-injection of GA4/7, especially in combination with BA, increased female cone yields significantly in genotype 276, but not in genotype 478.
- Subjects
PHYSIOLOGICAL effects of gibberellins; BENZYLAMINOPURINE; LODGEPOLE pine diseases &; pests; PLANT hormones; GIBBERELLINS
- Publication
Trees: Structure & Function, 2018, Vol 32, Issue 3, p765
- ISSN
0931-1890
- Publication type
Article
- DOI
10.1007/s00468-018-1670-7