Histology of Current Shoots of Japanese Cedar (<i>Cryptomeria japonica</i> D. Don) Inoculated with <i>Cercospora sequoiae</i> Ellis et Everhart

Yoshida, Kazuhiro

doi:10.1007/bf02760293

Cited by 2 publications

(1 citation statement)

References 2 publications

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“…Despite the growing knowledge of the physiological basis and ecological consequences of the presence of leaf phenolics in plant tissues, only a few extensive data sets are available to evaluate the relative importance of the variability of leaf phenolics caused by environmental changes and developmental stages (Kamata et al 1996;Yoshida 1998;Covelo and Gallardo 2001). There is scant information on detailed changes of leaf phenolics concentrations during development and senescence in C. equisetifolia plantations.…”

Section: Introductionmentioning

confidence: 97%

Changes in the N and P concentrations, N:P ratios, and tannin content in Casuarina equisetifolia branchlets during development and senescence

Zhang

Lin

et al. 2008

Journal of Forest Research

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Changes in the N and P concentrations, N:P ratios, and tannin content in Casuarina equisetifolia branchlets across a coastal gradient were studied at Chishan Forestry Center of Dongshan County, Fujian Province, China. (1) Total phenolics and protein precipitation capacity in young branchlets was significantly higher than in mature and senescent branchlets across a coastal gradient; extractable condensed tannin content was higher in young and mature branchlets than in senescent branchlets. Whereas proteinbound condensed tannins increased with senescence, fiberbound condensed tannins fluctuated without a consistent pattern; (2) N and P concentrations at various stages of branchlet development across a coastal gradient followed the same order: young branchlets [ mature branchlets [ senescent branchlets; N:P ratio of young branchlets was the lowest, and increased with maturity and senescence across a coastal gradient; phosphorus resorption efficiency was significantly higher than nitrogen resorption efficiency among corresponding coastal gradients in response to P deficiency (high N:P ratio), but nutrient resorption efficiency was influenced by coastal gradients; (3) significant linear relationships between total phenolics and nutrient contents indicated that polyphenolics had a potential effect on nutrient cycling.

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Section: Introductionmentioning

confidence: 97%

Changes in the N and P concentrations, N:P ratios, and tannin content in Casuarina equisetifolia branchlets during development and senescence

Zhang

Lin

et al. 2008

Journal of Forest Research

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Histological, chemical and gene expression differences between western redcedar seedlings resistant and susceptible to cedar leaf blight

Aldana,

Moa,

Mattsson

et al. 2024

Front. Plant Sci.

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IntroductionWestern redcedar (Thuja plicata) is an important species in the Cupressaceae both at economic and cultural levels in the Pacific Northwest of North America. In adult trees, the species produces one of the most weathering-resistant heartwoods among conifers, making it one of the preferred species for outdoor applications. However, young T. plicata plants are susceptible to infection with cedar leaf blight (Didymascella thujina), an important foliar pathogen that can be devastating in nurseries and small-spaced plantations. Despite that, variability in the resistance against D. thujina in T. plicata has been documented, and such variability can be used to breed T. plicata for resistance against the pathogen.ObjectiveThis investigation aimed to discern the phenotypic and gene expression differences between resistant and susceptible T. plicata seedlings to shed light on the potential constitutive resistance mechanisms against cedar leaf blight in western redcedar. MethodsThe study consisted of two parts. First, the histological differences between four resistant and four susceptible families that were never infected with the pathogen were investigated. And second, the differences between one resistant and one susceptible family that were infected and not infected with the pathogen were analyzed at the chemical (C, N, mineral nutrients, lignin, fiber, starch, and terpenes) and gene expression (RNA-Seq) levels.ResultsThe histological part showed that T. plicata seedlings resistant to D. thujina had constitutively thicker cuticles and lower stomatal densities than susceptible plants. The chemical analyses revealed that, regardless of their infection status, resistant plants had higher foliar concentrations of sabinene and α-thujene, and higher levels of expression of transcripts that code for leucine-rich repeat receptor-like protein kinases and for bark storage proteins.ConclusionThe data collected in this study shows that constitutive differences at the phenotypic (histological and chemical) and gene expression level exist between T. plicata seedlings susceptible and resistant to D. thujina. Such differences have potential use for marker-assisted selection and breeding for resistance against cedar leaf blight in western redcedar in the future.

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Histology of Current Shoots of Japanese Cedar (Cryptomeria japonica D. Don) Inoculated with Cercospora sequoiae Ellis et Everhart

Cited by 2 publications

References 2 publications

Changes in the N and P concentrations, N:P ratios, and tannin content in Casuarina equisetifolia branchlets during development and senescence

Changes in the N and P concentrations, N:P ratios, and tannin content in Casuarina equisetifolia branchlets during development and senescence

Histological, chemical and gene expression differences between western redcedar seedlings resistant and susceptible to cedar leaf blight

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