Free amino acid content in trunk, branches and branchlets of Araucaria angustifolia (Araucariaceae)

Hackbarth, Crizane; Soffiatti, Patricia; Zanette, Flávio; Floh, Eny Iochevet Segal; Macedo, Amanda Ferreira; Laureano, Henrique Aparecido

doi:10.1007/s11676-017-0581-6

Cited by 3 publications

(2 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Proline plays an important role in plant resistance to biotic and abiotic stress because of its functions as an osmolyte, chemical chaperone and ROS scavenger (Hackbarth et al ). We observed a marked increase in proline levels in stressed seedlings of Q. infectoria but unexpectedly not in Q. libani suggesting a minor role of proline in the defense system of the latter species.…”

Section: Discussionmentioning

confidence: 99%

Differential physiological and biochemical responses of Quercus infectoria and Q. libani to drought and charcoal disease

Ghanbary

Kouchaksaraei

Zarafshar

et al. 2019

Physiologia Plantarum

View full text Add to dashboard Cite

The vast oak-dominated forests of the Zagros Mountains in southwestern Iran currently undergo large-scale dieback driven by a combination of drought and increasing incidence of charcoal disease caused by the fungal pathogens Biscogniauxia mediterranea and Obolarina persica. Here, we explore the interactive effects between drought and charcoal disease agents on the physiology and biochemistry of Quercus infectoria and Quercus libani seedlings. The combination of pathogen attack and water limitation hampered plant development, especially in Q. libani seedlings, negatively affecting growth, biomass production, photosynthetic efficiency, and leaf water potential. An increase in markers of oxidative damage together with the upregulation of the antioxidant defense revealed that drought stress and pathogen infection led to pro-oxidative conditions in both oak species, especially in Q. libani, where larger changes in malondialdehyde and hydrogen peroxide occurred. The upregulation of the antioxidant system was more prominent in Q. infectoria than in Q. libani, resulting in enhanced enzyme activity and accumulation of non-enzymatic antioxidants. Fungal infection stimulated the activity of chitinase, phenylalanine ammonia lyase and -1,3-glucanase in Q. infectoria leaves and this response became more pronounced under water shortage. Our study highlights that drought stress greatly intensifies the effects of the charcoal disease. Moreover, our findings imply superior stress resistance of Q. infectoria conferred by a highly efficient antioxidant system, strong osmotic adjustment (through proline), and increases in resistance enzymes and secondary metabolites (phenols and flavonoids). Future investigations should focus on adult trees in their natural habitat including interactions with soil factors and other pathogens like nematodes, bacteria and other fungi. Because the present research was conducted on oak seedlings, the findings can be considered by forest nursery managers.

show abstract

Section: Discussionmentioning

confidence: 99%

Differential physiological and biochemical responses of Quercus infectoria and Q. libani to drought and charcoal disease

Ghanbary

Kouchaksaraei

Zarafshar

et al. 2019

Physiologia Plantarum

View full text Add to dashboard Cite

show abstract

“…In general, the araucaria secondary branches are flexible, have anatropic growth (without preferential direction) and a limited life cycle between 5 and 7 years (Zanette et al, 2017). For a better understanding of the branches of A. angustifolia, Hackbarth et al (2017) studied the different stems physiology of the species and found differences in the amino acids of trunk, branches and vines ("grimpas"). The result confirms the particularities of each stem and, therefore, for morphogenic change to occur (a primary branch is generated in place of a secondary branch), there must be some mechanism responsible for reprogramming gene expression and acquiring cellular competence.…”

Section: Longevity and Thickening Of Branchesmentioning

confidence: 99%

Scientific novel: Araucaria angustifolia branch may be converted into orthotropic trunk by grafting

2020

Self Cite

View full text Add to dashboard Cite

Grafting technique has been presented as an alternative for Araucaria angustifolia propagation. However, vegetative rescuing mature trees and obtaining large numbers of propagules is difficult, because the use of branch grafts has not been indicated due to its plagiotropic and morphogenic characteristic, generally resulting in undesired growth of the graft. So we aimed to describe the unpublished fact occurred in four plants of A. angustifolia grafted with grafts from primary branches that resulted in conversion to trunk. Plant growth and morphology were evaluated ten years after grafting. We verified vertical growth and organization of trunk and persistent branches with defined whorls, same to plants grafted with trunk grafts. Field tests with grafted plants using grafts obtained from the four plants resulted in same development pattern, proving the permanent morphogenic change and opening new perspectives for araucaria vegetative rescue and grafting. We concluded that trunciform shoots can be obtained by A. angustifolia grafting with plagiotropic primary branches. Despite the morphological clarity of trunciform shoots on grafted plagiotropic primary branches, it has not yet been possible to identify the causes of this reversion.

show abstract

Callus induction in Araucaria angustifolia using orthotropic and plagiotropic apexes: proteomic and morphoanatomical aspects

Terhaag

Ziemmer

Stefanello

et al. 2023

Plant Cell Tiss Organ Cult

View full text Add to dashboard Cite

Free amino acid content in trunk, branches and branchlets of Araucaria angustifolia (Araucariaceae)

Cited by 3 publications

References 37 publications

Differential physiological and biochemical responses of Quercus infectoria and Q. libani to drought and charcoal disease

Differential physiological and biochemical responses of Quercus infectoria and Q. libani to drought and charcoal disease

Scientific novel: Araucaria angustifolia branch may be converted into orthotropic trunk by grafting

Callus induction in Araucaria angustifolia using orthotropic and plagiotropic apexes: proteomic and morphoanatomical aspects

Contact Info

Product

Resources

About