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601.
602.
Satoshi Ohkubo Takeshi Saito Muhammad Abul Kalam Azad Hiromitsu Kawai Wataru Suda Shin Kore-eda 《Geomicrobiology journal》2020,37(7):595-602
AbstractMicrobial community structure reflects the surrounding natural environment and changes to that environment. Although the subsurface at 5–100?m depth is important for human activities and there are potential risks of environmental pollution in this region, there have been only a few reports of subsurface microbial community structures in terrestrial areas. We investigated the diversity and community compositions of Bacteria and Archaea in boring cores collected from various depths at three different sites in the southern Kanto Plain, Japan. The results of 16S rRNA gene amplicon sequencing using MiSeq showed that the microbial community composition varied with the geological unit. Proteobacteria (Alphaproteobacteria and Gammaproteobacteria) were dominant members within sediments accumulated during the Pleistocene in the Musashino Upland. In contrast, Acidobacteria and Chloroflexi characteristically appeared in the Holocene layers of the Arakawa Lowland. These data suggest that the subsurface microbial composition is controlled by the geological features of the sediments. 相似文献
603.
M. Shahadat Hossain Khan Keitarou Tawaraya Hiroshi Sekimoto Hiroyuki Koyama Yuriko Kobayashi Tetsuya Murayama Masaru Chuba Mihoko Kambayashi Yoshihito Shiono Matsuo Uemura Satoru Ishikawa Tadao Wagatsuma 《Physiologia plantarum》2009,135(1):73-83
We investigated variations in aluminum (Al) tolerance among rice plants, using ancestor cultivars from the family line of the Al-tolerant and widely cultivated Japonica cultivar, Sasanishiki. The cultivar Rikuu-20 was Al sensitive, whereas a closely related cultivar that is a descendant of Rikuu-20, Rikuu-132, was Al tolerant. These two cultivars were compared to determine mechanisms underlying variations in Al tolerance. The sensitive cultivar Rikuu-20 showed increased permeability of the plasma membrane (PM) and greater Al uptake within 1 h of Al treatment. This could not be explained by organic acid release. Lipid composition of the PM differed between these cultivars, and may account for the difference in Al tolerance. The tolerant cultivar Rikuu-132 had a lower ratio of phospholipids to Δ5 -sterols than the sensitive cultivar Rikuu-20, suggesting that the PM of Rikuu-132 is less negatively charged and less permeabilized than that of Rikuu-20. We used inhibitors of Δ5 -sterol synthesis to alter the ratio of phospholipids to Δ5 -sterols in both cultivars. These inhibitors reduced Al tolerance in Rikuu-132 and its Al-tolerant ancestor cultivars Kamenoo and Kyoku. In addition, Rikuu-132 showed a similar level of Al sensitivity when the ratio of phospholipids to Δ5 -sterols was increased to match that of Rikuu-20 after treatment with uniconazole-P, an inhibitor of obtusifoliol-14α-demethylase. These results indicate that PM lipid composition is a factor underlying variations in Al tolerance among rice cultivars. 相似文献
604.
605.
Toshiya Nishimura Fabian P. Suchy Joydeep Bhadury Kyomi J. Igarashi Carsten T. Charlesworth Hiromitsu Nakauchi 《Cell Stem Cell》2021,28(1):141-149.e3
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606.
Nakajima Hiromitsu; Yokota Takao; Takahashi Nobutaka; Matsumoto Takashi; Noguchi Masao 《Plant & cell physiology》1981,22(8):1405-1410
Changes in the contents of major endogenous plant hormones intobacco crown gall cells, namely IAA and ribosyl-trans-zeatin,during cell growth were examined using HPLC and 14C-labeledplant hormones. The content of IAA was high at the early logarithmicstage, while that of ribosyl-trans-zeatin was high at the middlelogarithmic stage. This suggests that cell growth is affectedfirst by IAA, then by ribosyl-trans-zeatin.
3 Present address: Department of Agricultural Chemistry, TottoriUniversity, Koyama, Tottori 680, Japan (Received July 13, 1981; Accepted September 11, 1981) 相似文献
607.
Sawano Hikaru Matsuzaki Takuma Usui Tomoyuki Tabara Midori Fukudome Akihito Kanaya Akihiro Tanoue Daichi Hiraguri Akihiro Horiguchi Gorou Ohtani Misato Demura Taku Kozaki Toshinori Ishii Kazuo Moriyama Hiromitsu Fukuhara Toshiyuki 《Journal of plant research》2017,130(1):45-55
Journal of Plant Research - The model plant Arabidopsis thaliana has five double-stranded RNA-binding proteins (DRB1-DRB5), two of which, DRB1 and DRB4, are well characterized. In contrast, the... 相似文献
608.
Journal of Plant Research - Scopelophila ligulata is known to be a Fe-hyperaccumulator moss; however, its mechanism of accumulation and the effects of Fe on pigments remain unclear. To clarify the... 相似文献
609.
Although masting in Southeast Asia is characterized by the interspecific synchronization of reproduction, little is known about the variation in regeneration strategies among sympatric tree species during major masting events. Herein, we examined the hypothesis that non-abundant species achieve greater seed survival per seed production at the pre- and post-dispersal stages by synchronizing reproduction with abundant species. During the masting event from May to September 2010, we installed seed traps in a primary forest plot of the Deramakot Forest Reserve, Borneo. To identify the possible causes of post-dispersal seed mortality, we conducted a seed-sowing experiment from September 2010 to July 2011 in a primary forest plot with high community-level dipterocarp seed density and two surrounding secondary forests with low seed densities. An abundant species (Shorea multiflora) produced more seeds than other species and exhibited a lower survival rate during the pre-dispersal stage. The ratio of aborted seeds was greater in species with greater seed production, while the ratio of seeds predated by insects was not, suggesting that resource limitations and/or greater inbreeding frequency may explain inefficient seed production. Interspecific variation was rarely observed for post-dispersal seed survival rates. Our study highlights the density-dependent variation in reproductive success between abundant and non-abundant dipterocarp species at the pre-dispersal stage. Non-abundant species achieved greater reproductive success by synchronizing reproduction with the masting of abundant species, which might be an important mechanism for sustainability of rare species populations. 相似文献
610.
Yayoi Takeuchi Hiromitsu Samejima Michiko Nakagawa Bibian Diway Tohru Nakashizuka 《Journal of plant research》2010,123(2):249-259
This study investigated whether reproductive success is affected by the intensity of neighborhood aggregation of adults in
the tropical tree Shorea laxa. We focused on three processes in the early reproductive stages: seed maturation; seed survival (categorizing sound seed,
predation by insects and predation by vertebrates) in pre-seed dispersal; and seedling survival in the post-seed dispersal
stage. We used a model selection procedure to examine the aggregation effect on reproductive success. The intensity of neighborhood
aggregation was represented by the neighborhood aggregation index, which contains the adult number within a specific radius
and the distances to neighboring adults (weight of proximity). Then, we evaluated the models exhaustively with the aggregation
index having different scales (radius and weight of proximity) to assess the scale on which aggregation had significant effects.
In particular, the best effective neighborhood scale, which is defined as the scale of the index in the model with minimum
Akaike information criterion, was examined to compare those scales among processes. We found that the probability of seed
maturation, seed survival and seedling survival decreased with the aggregation index at specific scales. This suggests that
aggregation influenced reproductive success negatively in both the pre- and post-seed dispersal stages. However, the selected radii differed among processes: >200 and 130 m in pre- and post-seed dispersal stages, respectively.
The selected weight of proximity also seemed to have a weak effect on all processes and was not different among processes. 相似文献