Analysis of Phytohormone Profiles during Male and Female Cone Initiation and Early Differentiation in Long-shoot Buds of Lodgepole Pine

Kong, Lisheng; Aderkas, Patrick von; Zaharia, Irina L.; Abrams, Suzanne R.; Lee, Tim; Woods, J. H.

doi:10.1007/s00344-011-9257-1

Cited by 16 publications

(7 citation statements)

References 48 publications

(34 reference statements)

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“…This fact suggest to us that under long drought periods ABAGE cleavage could be used by these plants to give active ABA; then, once plants are adapted to it, or the stress is reduced, this ABA could be degraded in part to 7?-OH ABA, but especially to PA and DPA. Changes in endogenous PA and DPA in different tissues have been reported (Suttle et al 2012) and, interestingly, spatial and temporal differences have recently been observed in several hormones including auxines, cytokinins, PA and ABAGE (Kong et al 2012). Our results led us to think that Manel genotype is the most sensitive one compared with the other genotypes.…”

Section: Discussionsupporting

confidence: 64%

“…Nevertheless, the high PA and DPA concentrations led us to think that this would be the main route of ABA degradation used by these genotypes. Likewise, as Kong et al (2012) suggest, higher concentrations of ABA metabolites might reflect a more active ABA metabolism. According to Jia et al (1996) and Zhang et al (1997), the rate of ABA catabolism is proportional to the ABA levels in plant tissues so, as more ABA is produced, more ABA is degraded into metabolites as PA.…”

Section: Discussionmentioning

confidence: 96%

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Involvement of abscisic acid metabolites and the oxidative status of barley genotypes in response to drought

2014

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Thameur, A., Ferchichi, A. and López-Carbonell, M. 2014. Involvement of abscisic acid metabolites and the oxidative status of barley genotypes in response to drought. Can. J. Plant Sci. 94: 1481–1490. Endogenous concentrations of free abscisic acid (ABA), abscisic acid glucosyl ester (ABAGE), phaseic acid (PA), dihydrophaseic acid (DPA) and 7′-hydroxy ABA (7′-OH ABA) were analysed by means of a LC–MS/MS system in five genotypes of barley (Hordeum vulgare L.) grown under well-watered and drought stress conditions. For this purpose a drought treatment was conducted using genotypes: ‘Ardahoui’, ‘Manel’, ‘Pakistan’, ‘Rihane’ and ‘Roho’. Our results show that free and conjugated ABA levels increased in all genotypes grown under water stress, except in Manel genotype, in which ABAGE levels were the lowest. In contrast, genotypes Ardhaoui and Roho showed the highest ABA and ABAGE levels. Nevertheless, drought Rihane plants showed the maximum ability to increase the endogenous ABA concentrations. PA, DPA and 7′-OH ABA increased also in all drought genotypes, especially in the leaves of Manel and Roho genotypes, while the highest ability to increase the endogenous PA content corresponded to genotypes Ardahoui and Pakistan. To evaluate the plant oxidative status, some antioxidant compounds were analysed. Under drought conditions, small changes in some of them were seen. Among the genotypes studied, Manel was the only one which did not show increases in malondialdehyde (MDA) and, in parallel, showed a decrease in ABAGE content. These results provide us valuable information and contribute to the knowledge of the different responses of these genotypes to drought stress.

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Section: Discussionsupporting

confidence: 64%

Section: Discussionmentioning

confidence: 96%

Involvement of abscisic acid metabolites and the oxidative status of barley genotypes in response to drought

2014

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“…The ratio between ABA and cytokinins in xylem sap are postulated to play an important 16 role in stress signalling (Alvarez et al 2008, Schachtman andGoodger 2008). The higher ratios of cytokinins to ABA may thus favour faster vegetative growth and female cone formation (Kong et al 2011(Kong et al , 2012. In the results reported here, higher concentrations of cytokinins and lower concentrations of ABA were found in the genotype of a good cone producer than in the poor cone producer, in keeping with previously published studies on lodgepole pine (Kong et al 2011).…”

Section: Effects Of Injected Pgrs On Ratios Of Endogenous Phytohormonessupporting

confidence: 90%

“…PGR treatments resulted in higher endogenous concentrations of zeatin (Z)type cytokinins and lower concentrations of abscisic acid (ABA) and its metabolite, ABA glucosyl ester (ABA-GE). This corroborates earlier investigations (Kong et al 2011(Kong et al , 2012 in which higher concentrations of (Z)-type cytokinins and lower concentrations of ABA favoured 6 female cone formation. Kong et al (2016) found that paste application altered both the number and location of female cones.…”

Section: Introductionsupporting

confidence: 92%

Effects of stem-injected gibberellins and 6-benzylaminopurine on phytohormone profiles and cone yield in two lodgepole pine genotypes

Kong

Aderkas

Zaharia

2018

Trees

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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 (Pinus contorta Dougl. ex Loud. var. latifolia 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 GA 4 and GA 7 (GA 4/7 ) and/or BA. Injected GA 4/7 affected bud concentrations of GA 4 and GA 7 ,. Injected PGRs, with the exception of BA injection, decreased concentrations of abscisic acid (ABA) and ABA glucose-ester at weeks 5 and/or week 7. Internal concentrations of trans-zeatin riboside (t-ZR) increased in response to all treatments at week 3 in genotype 276. In genotype 478, t-ZR only increased with treatments of BA or GA 4/7 plus BA. Dihydrozeatin riboside concentrations increased in response to GA 4/7 plus BA treatment at week 7 in genotype 276. Concentrations of isopentenyl adenosine declined with treatments of GA 4/7 and GA 4/7 plus BA in genotype 276 at week 5. In genotype 478, a similar decrease was caused by GA 4/7 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 GA 4/7 plus BA. Stem-injection of GA 4/7 , especially in combination with BA, increased female cone yields significantly in genotype 276, but not in genotype 478.

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“…(Niu et al, 2013(Niu et al, , 2016; Pinus thunbergii Parl. (Kong et al, 2012), Pinus bungeana Zucc. ex Endel.…”

Section: Introductionunclassified

Initiation and Development of Sex Reversal and Ovule Abortion Process of Pinus massoniana Polycone Strobilu

Zhao¹

2018

IJAB

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This paper describes the morphological and microstructure of Pinus massoniana strobilus. The result revealed two distinct development processes of the polycone. The first process was seen during the strobilus differentiation stage of P. massoniana. It occurred from August and synchronized with the starting time of the normal microstrobili development to the end of December, with strings of reproductive primordia on the terminal buds. During this period, not only the visible microstrobili were shown, but also the megastrobilum, characterized bracts and ovuliferous scales appeared. Even strings of megastrobilum primordia grew at the base of the terminal buds. The second process was seen during the sex reversal of the development of the microstrobilus. The terminal buds differentiated and developed in the form of microstrobilus till mid-March next year. In the next 10 days or so, the microsporangia changed into bracts and ovuliferous scales of the megastrobilus basipetally. By the end of March, the microstrobili were entirely converted to megastrobili and the female "polycone" formed. Besides, ovule abortion was observed during the development of female gametophyte of the polycone. In mid-April, the number of free nuclei of ovules in the female gametophyte of polycone began to decrease and the center gradually became empty. At the beginning of May, the free nuclei of the normal ovules began to cellize, but the free nuclei of the aborted ovules in the polycone virtually disappeared and only the cavity was visible.

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Analysis of Phytohormone Profiles during Male and Female Cone Initiation and Early Differentiation in Long-shoot Buds of Lodgepole Pine

Cited by 16 publications

References 48 publications

Involvement of abscisic acid metabolites and the oxidative status of barley genotypes in response to drought

Involvement of abscisic acid metabolites and the oxidative status of barley genotypes in response to drought

Effects of stem-injected gibberellins and 6-benzylaminopurine on phytohormone profiles and cone yield in two lodgepole pine genotypes

Initiation and Development of Sex Reversal and Ovule Abortion Process of Pinus massoniana Polycone Strobilu

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