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Article
Comparison of fertile and sterile male gametogenesis in Cryptomeria japonica D. Don
Cryptomeria japonica D. Don is one of the most important conifers for forestry; however, the pollinosis caused by this species is the most prevalent allergy in Japan. Male-sterile mutants have attracted attention...
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Article
Open AccessThe construction of a high-density linkage map for identifying SNP markers that are tightly linked to a nuclear-recessive major gene for male sterility in Cryptomeria japonica D. Don
High-density linkage maps facilitate the map** of target genes and the construction of partial linkage maps around target loci to develop markers for marker-assisted selection (MAS). MAS is quite challenging...
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Article
Paternity analysis in a progeny test of Cryptomeria japonica revealed adverse effects of pollen contamination from outside seed orchards on morphological traits
To evaluate the effects of pollen contamination from outside of Cryptomeria japonica seed orchard on the growth performance (height and diameter at breast height, DBH) and morphological traits (stem straightness ...
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Article
Mating patterns in an indoor miniature Cryptomeria japonica seed orchard as revealed by microsatellite markers
To evaluate the practical application of an indoor seed orchard, we compared the seed production, final germination rates and mating patterns of potted Cryptomeria japonica D. Don clones in two miniature seed orc...
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Article
Open AccessA potential space- and power-effective muon sensor module for imaging a volcano
The application of muon radiography will be greatly enhanced by the use of two muon sensor modules that save electric power consumption and are easily transportable. Muon sensor modules used for a volcano obse...
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Article
Open AccessDevelopment of a cost-effective plastic scintillator for cosmic-ray muon radiography of a volcano
Muon radiography has recently made it possible to perform imaging of the internal structure of a volcano. Muon-detecting experiments were carried out at Asama and Usu volcanoes using a newly developed scintill...
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Article
Open AccessDevelopment of a portable assembly-type cosmic-ray muon module for measuring the density structure of a column of magma
We have developed a portable assembly type cosmic-ray muon telescope system with power-effective real-time readings to monitor the internal structure of a volcano. Using this system, we have performed measurem...
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Article
Cytological study of a male-sterile Cryptomeria japonica that does not release microspores from tetrads
To determine the mechanism of male-sterility Cryptomeria japonica tree Shindai3, the process of microspore development was observed under light and fluorescence microscopy. Microspore development in the Shindai3 ...
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Article
Gene flow and mating system in five Cryptomeria japonica D. Don seed orchards as revealed by analysis of microsatellite markers
We investigated gene flow in five Cryptomeria japonica D. Don seed orchards of two different types (common and miniature) at widely spaced locations using microsatellite markers. The quality of a seed crop is det...
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Article
Plus tree of Cryptomeria japonica D. Don with a heterozygous male-sterility gene
To find plus tree clones of Cryptomeria japonica that are heterozygous for a male-sterility gene (Aa), we crossed a homozygous male-sterile tree (aa) with 63 clones. Male sterility in this case is controlled by a...
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Article
Stand structure and composition of a 60-year-old larch (Larix kaempferi) plantation with retained hardwoods
Tree retention is understood as a key practice in creating complexity, leading to heterogeneity in resources and habitats in managed stands. In this article, we clarify the long-term effects of tree retention ...
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Article
A histological comparison of the development of pollen and female gametophytes in fertile and sterile Cryptomeria japonica
To determine a possible mechanism causing male and female sterility in Cryptomeria japonica male and female cones were collected from a C. japonica, tree, ShinDai2, that lacks pollen release and fertile seeds and...
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Article
Microsatellite markers reveal high allelic variation in natural populations of Cryptomeria japonica near refugial areas of the last glacial period
Using 11 microsatellite markers, we investigated the allelic variation and genetic structure of Cryptomeria japonica, across most of its natural distribution. The markers displayed high levels of polymorphism (av...
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Article
Study of sugi (Cryptomeria japonica D. Don) with male-sterility gene using CAPS markers
The frequency of open-pollinated male-sterile seedlings from a male-sterile mother tree in Cryptomeria japonica D. Don was determined in 765 open-pollinated seedlings. Pollen was not formed by 29 out of the 765 s...
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Article
Effects of stand density on the productivity ofCryptomeria japonica male flowers
We have studied male flower production and relative illumination in clonal sugi (Cryptomeria japonica) forests planted at densities of 1,500/ha, 3,000/ha, and 5,000/ha, to clarify the effects of forest management...
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Article
Inheritance of the trait of male sterility inCryptomeria japonica
Matings of male-sterileC. japonica and fertile eliteC. japonica, as well as backcross seedlings of male-sterile trees, were carried out to clarify the genetic trait of male sterility of theC. japonica. The seeds ...
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Article
Cytological and genetical studies on male sterility inCryptomeria japonica D. Don
Genetic male sterility is a useful trait in plant breeding, especially in angiosperm crops such as corn, onion and carrot. We found a male sterile sugi (Cryptomeria japonica D. Don) tree in Toyama, Japan. Pollen ...
