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Journal Articles

Immediate and potential long-term effects of consecutive heat waves on the photosynthetic performance and water balance in Douglas-fir

Duarte, A. G.*; Katata, Genki; Hoshika, Yasutomo*; Hossain, M.*; Kreuzwieser, J.*; Arneth, A.*; Ruehr, N. K.*

Journal of Plant Physiology, 205, p.57 - 66, 2016/10

 Times Cited Count:33 Percentile:82.84(Plant Sciences)

The frequency and intensity of climatic extremes, such as heat waves, are predicted to increase globally, with severe implications for terrestrial carbon and water cycling. Temperatures may rise above critical thresholds that allow trees to function optimally, with unknown long-term consequences for forest ecosystems. In this context, we investigated how photosynthetic traits and the water balance in Douglasfir are affected by exposure to three heat waves. Photosynthetic carboxylation efficiency was mostly unaffected, but electron transport and photosynthetic rates under saturating light were strongly influenced by the heat waves, with lagging limitations on photosynthesis still being observed six weeks after the last heat wave. We also observed lingering heat-induced inhibitions on transpiration, minimum stomatal conductance, and nighttime stomatal conductance. Results from the stomatal models used to calculate minimum stomatal conductance were similar to gs-night and indicated changes in leaf morphology, such as stomatal occlusions and alterations in epicuticular wax. Our results show Douglas-fir's ability to restrict water loss following heat stress, but at the price of reduced photosynthetic performance. Such limitations indicate potential long-term restrictions that heat waves can impose on tree development and functioning under extreme climatic conditions.

Journal Articles

An Improved system for shoot regeneration from stem explants of Lombardy poplar (${it Populus nigra}$ L. var. ${it italica}$ Koehne)

Biswas, K.; Mori, Takeshi*; Kogawara, Satoshi*; Hase, Yoshihiro; Narumi, Issei; Ono, Yutaka

American Journal of Plant Sciences, 3(9), p.1181 - 1186, 2012/09

Journal Articles

Molecular characterization of an anthocyanin-related glutathione $$S$$-transferase gene in cyclamen

Kitamura, Satoshi; Akita, Yusuke; Ishizaka, Hiroshi*; Narumi, Issei; Tanaka, Atsushi

Journal of Plant Physiology, 169(6), p.636 - 642, 2012/04

 Times Cited Count:63 Percentile:89.58(Plant Sciences)

In order to identify the anthocyanin-related GST in cyclamen, four candidates of GSTs (CkmGST1 to CkmGST4) were isolated. Phylogenetic analysis indicated that CkmGST3 was closely related to PhAN9, an anthocyanin-related GST of petunia. Expression analysis at different developmental stages of petals revealed that CkmGST3 was strongly expressed in paler pigmented petals than in fully pigmented petals, in contrast to the constitutive expression of the other three candidates during petal development. This expression pattern of CkmGST3 was correlated with those of other anthocyaninbiosynthetic genes such as CkmF3'5'H and CkmDFR2. Molecular complementation of Arabidopsis ${it tt19}$, a knockout mutant of an anthocyanin-related GST gene, demonstrated that CkmGST3 could complement the anthocyanin-less phenotype of ${it tt19}$. Transgenic plants that expressed the other three CkmGSTs did not show anthocyanin accumulation. These results indicate CkmGST3 functions in anthocyanin accumulation in cyclamen.

Journal Articles

Metabolic profiling and cytological analysis of proanthocyanidins in immature seeds of Arabidopsis thaliana flavonoid accumulation mutants

Kitamura, Satoshi; Matsuda, Fumio*; Toge, Takayuki*; Sakakibara, Keiko*; Yamazaki, Mami*; Saito, Kazuki*; Narumi, Issei

Plant Journal, 62(4), p.549 - 559, 2010/05

 Times Cited Count:74 Percentile:89.2(Plant Sciences)

Arabidopsis TT19 encodes a GST-like protein that is involved in the accumulation of proanthocyanidins (PAs) in the seed coat. PA accumulation sites in tt19 immature seeds were observed as small vacuolar-like structures, which show unique thick morphology by differential interference contrast microscopy. The distribution pattern of the thick structures overlapped the location of PA accumulation sites in tt19. Metabolic profiling of the solvent-soluble fraction demonstrated that PA derivatives such as epicatechins and epicatechin oligomers, although highly accumulated in the wild-type, were absent in tt19. We also revealed that tt12 specifically accumulated glycosylated epicatechins, the putative transport substrates for TT12. Given the cytosolic localization of functional GFP-TT19 proteins, our results suggest that TT19, which acts prior to TT12, functions in cytosol for regular accumulation of PA precursors such as epicatechin and glycosylated epicatechin in the vacuole.

Journal Articles

A Gene encoding ${it SMALL ACIDIC PROTEIN 2}$ potentially mediates the response to synthetic auxin, 2,4-dichlorophenoxyacetic acid, in ${it Arabidopsis thaliana}$

Nakasone, Akari; Yamada, Maki*; Kiyosue, Tomohiro*; Narumi, Issei; Uchimiya, Hirofumi*; Ono, Yutaka

Journal of Plant Physiology, 166(12), p.1307 - 1313, 2009/08

 Times Cited Count:4 Percentile:13.83(Plant Sciences)

Journal Articles

A UVB-hypersensitive mutant in ${it Arabidopsis thaliana}$ is defective in the DNA damage response

Sakamoto, Ayako; Lan, V. T. T.*; Puripunyavanich, V.*; Hase, Yoshihiro; Yokota, Yuichiro; Shikazono, Naoya; Nakagawa, Mayu*; Narumi, Issei; Tanaka, Atsushi

Plant Journal, 60(3), p.509 - 517, 2009/07

 Times Cited Count:20 Percentile:52.68(Plant Sciences)

no abstracts in English

Journal Articles

${it Arabidopsis thaliana}$ Y-family DNA polymerase $$eta$$ catalyses translesion synthesis and interacts functionally with PCNA2

Anderson, H.*; Vonarx, E.*; Pastushok, L.*; Nakagawa, Mayu; Katafuchi, Atsushi*; Gruz, P.*; Rubbo, A.*; Grice, D.*; Osmond, M.*; Sakamoto, Ayako; et al.

Plant Journal, 55(6), p.895 - 908, 2008/09

 Times Cited Count:42 Percentile:74.32(Plant Sciences)

Journal Articles

Biosynthesis and secretion of mugineic acid family phytosiderophores in zinc-deficient barley

Suzuki, Motofumi*; Takahashi, Michiko*; Tsukamoto, Takashi*; Watanabe, Satoshi; Matsuhashi, Shimpei; Yazaki, Junshi*; Kishimoto, Naoki*; kikuchi, Shoshi*; Nakanishi, Hiromi*; Mori, Satoshi*; et al.

Plant Journal, 48(1), p.85 - 97, 2006/10

 Times Cited Count:161 Percentile:95.68(Plant Sciences)

Journal Articles

A Small acidic protein 1 (SMAP1) mediates responses of the arabidopsis root to the synthetic auxin 2,4-dichlorophenoxyacetic acid

Rahman, A.*; Nakasone, Akari*; Chhun, T.*; Oura, Chiharu*; Biswas, K. K.*; Uchimiya, Hirofumi*; Tsurumi, Seiji*; Baskin, T. I.*; Tanaka, Atsushi; Ono, Yutaka

Plant Journal, 47(5), p.788 - 801, 2006/09

 Times Cited Count:33 Percentile:61.66(Plant Sciences)

2,4-D, a chemical analogue of IAA, is widely used as a growth regulator and exogenous source of auxin. It is believed that they share a common response pathway. Here, we show that a mutant, ${it antiauxin resistant1}$ (${it aar1}$) is resistant to 2,4-D, yet nevertheless responds like the wild type to IAA. That the ${it aar1}$ mutation alters 2,4-D responsiveness specifically was confirmed by analysis of GUS expression in the${it DR5:GUS}$ and ${it HS:AXR3NT-GUS}$ backgrounds, as well as by real-time PCR quantification of ${it IAA11}$ expression. Complementation and RNAi experiments identified a gene that confers 2,4-D responsiveness. The gene encodes a ${it small, acidic protein 1}$with unknown function and present in plants, animals, and invertebrates. These results suggest that SMAP1 is a regulatory component that mediates responses to 2,4-D and that responsiveness to 2,4-D and IAA are partially distinct.

Journal Articles

A Mutation in the ${it uvi4}$ gene promotes progression of endo-reduplication and confers increased tolerance towards ultraviolet B light

Hase, Yoshihiro; Trung, K. H.*; Matsunaga, Tsukasa*; Tanaka, Atsushi

Plant Journal, 46(2), p.317 - 326, 2006/04

 Times Cited Count:98 Percentile:89.66(Plant Sciences)

We have isolated and characterized a new ultraviolet-B (UV-B)-resistant mutant, ${it uvi4}$, of Arabidopsis. The fresh weight of ${it uvi4}$ plants grown under supplemental UV-B light was more than twice that of the wild type. No significant difference was found in the ability to repair the UV-B-induced cyclobutane pyrimidine dimers (CPDs), or in the amount of UV-B absorptive compounds, both of which are well known factors that contribute to UV sensitivity. Positional cloning revealed that the ${it UVI4}$ gene encodes a novel basic protein of unknown function. We found that the hypocotyl cells in ${it uvi4}$ undergo one extra round of endoreduplication. The ${it uvi4}$ mutation also promoted the progression of endoreduplication during leaf development. The ${it UVI4}$ gene is expressed mainly in actively dividing cells. In the leaves of P${it UVI4}$::GUS plants, the GUS signal disappeared in basipetal fashion as the leaf developed. The total leaf blade area was not different between ${it uvi4}$ and the wild type through leaf development, while the average cell area in the adaxial epidermis was considerably larger in ${it uvi4}$, suggesting that the ${it uvi4}$ leaves have fewer but larger epidermal cells. These results suggest that the ${it UVI4}$ is necessary for the maintenance of the mitotic state and the loss of ${it UVI4}$ function stimulated endoreduplication. Tetraploid Arabidopsis was hyperresistant to UV-B compared to diploid Arabidopsis, suggesting that the enhanced polyploidization is responsible for the increased UV-B tolerance of the ${it uvi4}$.

Journal Articles

Rice plants take up iron as an Fe$$^{3+}$$-phytosiderophore and as Fe$$^{2+}$$

Ishimaru, Yasuhiro*; Suzuki, Motofumi*; Tsukamoto, Takashi*; Suzuki, Kazumasa*; Nakazono, Mikio*; Kobayashi, Takanori*; Wada, Yasuaki*; Watanabe, Satoshi; Matsuhashi, Shimpei; Takahashi, Michiko*; et al.

Plant Journal, 45(3), p.335 - 346, 2006/02

 Times Cited Count:506 Percentile:99.64(Plant Sciences)

Journal Articles

${it Klavier}$ (${it klv}$), a novel hypernodulation mutant of ${it Lotus japonicus}$ affected in vascular tissue organization and floral induction

Kira, Erika*; Tateno, Kumiko*; Miura, Kinichiro*; Haga, Tatsuya*; Hayashi, Masaki*; Harada, Kyuya*; Sato, Shusei*; Tabata, Satoshi*; Shikazono, Naoya; Tanaka, Atsushi; et al.

Plant Journal, 44(3), p.505 - 515, 2005/11

 Times Cited Count:89 Percentile:87.3(Plant Sciences)

no abstracts in English

Journal Articles

Light dependency of resistance to ionizing radiation in ${it Euglena gracilis}$

Hayashi, Hirotaka; Narumi, Issei; Wada, Seiichi; Kikuchi, Masahiro; Furuta, Masakazu*; Uehara, Kaku*; Watanabe, Hiroshi*

Journal of Plant Physiology, 161(10), p.1101 - 1106, 2004/10

 Times Cited Count:8 Percentile:19.73(Plant Sciences)

The resistance of ${it Euglena gracilis}$ strains Z (wild type) and SM-ZK (chloroplast-deficient mutant) to ionizing radiation was investigated. The colony forming ability of ${it E. gracilis}$ strain Z was higher than that of strain SM-ZK after $$gamma$$-irradiation. For both strains, the resistance of light-grown cells was higher than that of dark-grown cells, suggesting that the light conditions during the culture contribute to the radiation resistance of ${it E. gracilis}$. The comet assay showed that the ability of rejoining DNA double-strand breaks (dsb) was much higher in the light-grown cells. These results suggest that ${it E. gracilis}$ possesses a light-induced repair system to cope with DNA dsb.

Journal Articles

${it TRANSPARENT TESTA 19}$ is involved in the accumulation of both anthocyanins and proanthocyanidins in ${it Arabidopsis}$

Kitamura, Satoshi; Shikazono, Naoya; Tanaka, Atsushi

Plant Journal, 37(1), p.104 - 114, 2004/01

 Times Cited Count:353 Percentile:99(Plant Sciences)

Flavonoid compounds such as anthocyanins and proanthocyanidins (PAs; so-called condensed tannins) must be transported from the site of synthesis in the cytosol to the vacuoles. Novel Arabidopsis mutants, transparent testa 19 (tt19), which were induced by ion beam irradiation, showed a great reduction of anthocyanin pigments in the vegetative parts as well as brown pigments in the seed coat. The TT19 gene was isolated by chromosome walking and the gene candidate approach, and was shown to be a member of the Arabidopsis glutathione S-transferase (GST) gene family. Heterologous expression of a putative ortholog, petunia AN9, in tt19 complemented the anthocyanin accumulation but not the brown pigmentation in the seed coat. This suggests that the TT19 gene is required for vacuolar uptake of anthocyanins into vacuoles, but that it has also a different function from AN9. The depositional pattern of PA precursors in the mutant was different from that in the wild type. These results indicate that TT19 participates in the PA pathway as well as the anthocyanin pathway of Arabidopsis.

Journal Articles

FRL1 is required for petal and sepal development in arabidopsis

Hase, Yoshihiro; Tanaka, Atsushi; Baba, Tomohiro*; Watanabe, Hiroshi

Plant Journal, 24(1), p.21 - 32, 2000/10

 Times Cited Count:47 Percentile:72.55(Plant Sciences)

no abstracts in English

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