A Note on the Distribution of Radial Resin Canals in Larix Leptolepis Gord.

Takizawa, Tokihiro; Takahashi, Makoto; Kawaguchi, Noriko

doi:10.1163/22941932-90000702

Cited by 3 publications

(3 citation statements)

References 3 publications

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“…All surveyed fusiform rays (>50), without exception, contained a radial resin canal. Takizawa et al (1980) investigated the distribution of radial resin canals in Larix leptolepis Gord., and reported that there were 1 to 2 radial resin canals per square millimeter in the tangential section of the latewood of each annual ring. In this study, we found that the average number in P. densiflora was 0.76/mm 2 .…”

Section: Appearance and Frequency Of Radial Resin Canalsmentioning

confidence: 99%

“…Resin canals are a common feature in some coniferous trees, and members of the Pinaceae were classified in accordance with this feature by Jeffrey in 1905 (Bannan 1936). Further, in the genus Pinus, both axial and radial resin canals appear as normal features of the wood, and because of their importance in wood technology and resin extraction, their formation and anatomical features have been studied by many investigators (Bannan 1933(Bannan , 1936Chattaway 1951;Mergen & Echols 1955;Takizawa et al 1980;Nanko et al 1984;Kuroda 1986;Werker & Fahn 1969;Yamanaka 1989). The resin canals are surrounded by a layer of thin-walled, unlignified secretory cells which are termed epithelial cells.…”

Section: Introductionmentioning

confidence: 99%

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Anatomical Features Of Radial Resin Canals In Pinus Densiflora

Zhang¹,

Fujii²,

Abe³

et al. 2008

IAWA J

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We investigated radial resin canals in Pinus densiflora by means of serial tangential sections taken from phloem to xylem through the cambium. The canals were found within fusiform rays in both phloem and xylem. The ducts were closed in the cambial zone, but opened at widely differing distances from the cambium among individual radial resin canals, ranging from 120 to 340 μm on the phloem side and from 260 to 640 μm on the xylem side. Further, the ducts were not open continuously on both sides. The average number of radial resin canals in the tangential plane was 0.76/mm2. In the cambial zone, central cells of fusiform rays which might develop into epithelial cells later, were smaller and more deeply stained than the surrounding ray initial cells, allowing them to be identified at the initial stage. Two or more radial resin canals situated nearby each other were connected through an axial resin canal.

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Section: Appearance and Frequency Of Radial Resin Canalsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Anatomical Features Of Radial Resin Canals In Pinus Densiflora

Zhang¹,

Fujii²,

Abe³

et al. 2008

IAWA J

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“…However, biseriate rays which result from the fusion of two uniseriate rays such as shown in Figure 21 have not been described previously. Takizawa et al (1980) sometimes observed that in Larix leptolepis within one growth period two closely spaced uniseriate rays became a multiseriate one containing a radial resin canal. The frequency of occurrence of such biseriate rays as shown in Figure 21 was not detennined in the present study.…”

Section: Abnormal Raysmentioning

confidence: 99%

Sem Observations on Indented Rings

Ohtani¹,

Fukazawa²,

Fukumorita³

1987

IAWA J

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Heritability and characteristics of resin ducts in Pinus oocarpa stems in Michoacán, Mexico

Fabián-Plesníková

Sáenz‐Romero

Cruz-de-León³

et al. 2021

IAWA J.

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Despite the extensive distribution and use of Pinus oocarpa in Mexico, knowledge on the range of genetic variation and magnitude of quantitative parameters of the defensive structures of the species is rare. Our study attempts to fill this gap by providing a comprehensive assessment of resin duct traits in mother trees and their offsprings in an open-pollinated trial of P. oocarpa. Resin ducts are fundamental structures of the defense mechanisms of the coniferous trees. They vary depending on the age of the tree, the genotype, the species, and may be influenced by environmental factors. We investigated intraspecific variation among families of the resin duct system in secondary vascular tissues (wood and inner bark) of P. oocarpa trees. Our study attempts to explore the variance and the possible genetic control of these defensive structures. We hypothesized that the resin duct features analyzed would vary with the tree’s genetic make-up. We analyzed samples from two groups of trees. First, from mature mother trees selected as superior in resin yield. Second, from their six-year-old off-springs established in a progeny trial. Axial and radial ducts showed differences in their size and quantity, between wood and bark and between ages. The axial duct density showed differences among families, and the heritability estimates were moderate. In P. oocarpa trees selected as phenotypically superior in resin yield, the size of its constitutive resin ducts is a less variable trait, and the differences in axial duct density can be attributed to genetic factors.

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A Note on the Distribution of Radial Resin Canals in Larix Leptolepis Gord.

Cited by 3 publications

References 3 publications

Anatomical Features Of Radial Resin Canals In Pinus Densiflora

Anatomical Features Of Radial Resin Canals In Pinus Densiflora

Sem Observations on Indented Rings

Heritability and characteristics of resin ducts in Pinus oocarpa stems in Michoacán, Mexico

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