scholarly journals Analysis of the windthrow of Sanbu-sugi cultivar of Cryptomeria japonica D. Don and Lithocarpus edulis (Makino) Nakai caused by the Reiwa 1 Boso Peninsula Typhoon

2021 ◽  
Vol 47 (1) ◽  
pp. 105-110
Author(s):  
Tatsuaki KOBAYASHI ◽  
Rina TAKAHASHI ◽  
Kenta KANBARA ◽  
Akira KATO ◽  
Terumasa TAKAHASHI ◽  
...  
Forests ◽  
2020 ◽  
Vol 11 (7) ◽  
pp. 771
Author(s):  
Takeshi Tange ◽  
Feng Ge

This study aimed to clarify the environmental factors limiting the height of aged Cryptomeria japonica trees. The study was conducted on C. japonica plantations of about 100 years old at the Boso Peninsula, Japan, where the climatic conditions are almost uniform. Twenty-eight plots measuring 10 × 10 m were established on ridges, and 40 plots were established on the middle or lower sections of slopes. The stand ages ranged from 93 to 115 years old. The height of the tallest tree and soil depth (SD) were measured in each plot, and the wetness index (WI) and openness (OP) of each plot were calculated using a digital elevation model. The tree height at the 100-year age (H100) was estimated. The H100 ranged from 16.2 to 44.9 m and was significantly correlated with the logWI (r = 0.78) and OP (r = −0.70). SD and H100 were significantly correlated in the plots on the ridges but not in the plots on the middle or lower sections of slopes. It indicated that soil water retention capacity might limit tree height in the relatively dry soil conditions. The coefficient of determination adjusted by the number of parameters for H100 predicted using multiple regression analysis with environmental factors of logWI, logWI and OP, or logWI, OP and SD were 0.60, 0.69, and 0.73, respectively. The inclusion of OP and SD in the model improved the prediction of H100, suggesting that the wind and rooting depth could be the influencing factors in determining the height of aged trees. The findings of this study could be used in the planning and management of forestry plantations of long rotation system.


Author(s):  
Chi-I Chang ◽  
Cheng-Chi Chen ◽  
Yueh-Hsiung Kuo
Keyword(s):  

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Yoshihiko Nanasato ◽  
Masafumi Mikami ◽  
Norihiro Futamura ◽  
Masaki Endo ◽  
Mitsuru Nishiguchi ◽  
...  

AbstractCryptomeria japonica (Japanese cedar or sugi) is one of the most important coniferous tree species in Japan and breeding programs for this species have been launched since 1950s. Genome editing technology can be used to shorten the breeding period. In this study, we performed targeted mutagenesis using the CRISPR/Cas9 system in C. japonica. First, the CRISPR/Cas9 system was tested using green fluorescent protein (GFP)-expressing transgenic embryogenic tissue lines. Knock-out efficiency of GFP ranged from 3.1 to 41.4% depending on U6 promoters and target sequences. The GFP knock-out region was mottled in many lines, indicating genome editing in individual cells. However, in 101 of 102 mutated individuals (> 99%) from 6 GFP knock-out lines, embryos had a single mutation pattern. Next, we knocked out the endogenous C. japonica magnesium chelatase subunit I (CjChlI) gene using two guide RNA targets. Green, pale green, and albino phenotypes were obtained in the gene-edited cell lines. Sequence analysis revealed random deletions, insertions, and replacements in the target region. Thus, targeted mutagenesis using the CRISPR/Cas9 system can be used to modify the C. japonica genome.


2003 ◽  
Vol 92 (3) ◽  
pp. 291-295 ◽  
Author(s):  
Yukiko Morimoto ◽  
Tadashi Yasuhara ◽  
Akiko Sugimoto ◽  
Atsuko Inoue ◽  
Izumi Hide ◽  
...  
Keyword(s):  

New Forests ◽  
2009 ◽  
Vol 39 (3) ◽  
pp. 261-273 ◽  
Author(s):  
Yoshinari Moriguchi ◽  
Yoko Yamazaki ◽  
Hideaki Taira ◽  
Yoshihiko Tsumura

1999 ◽  
Vol 45 (3) ◽  
pp. 271-273 ◽  
Author(s):  
Shang-Tzen Chang ◽  
Sheng-Yang Wang ◽  
Sen-Sung Cheng

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