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Title Studies on Regulation of Gene Expression in Cultured Studies on Regulation of Gene Expression in Cultured Green Title Cells of Tobacco( Dissertation_全文 ) Author(s) Takeda, Satomi Citation Kyoto University (京都大学) Issue Date 1993-05-24 URL http://dx.doi.org/10.11501/3067547 Right Type Thesis or Dissertation Textversion author Kyoto University Studies on Regulation of Gene Expression in Cultured Green Cells of Tobacco SATOMI TAKEDA 1993 CONTENTS INTRODUCTIO:\ --- 1 CHAPTER I PHOTOSYNTHETIC CHARACTERISTICS IN CULTURED GREEN CEllS OF TOBACCO ---8 CHAPTER II EFFECTS OF SEVERAL HERBICIDES ON PHOTOAUTOTROPI-ITC, PHOTOMIXOTROPI-ITC AND HETEROTROPI-ITC CULTURED TOBACCO CELLS AND SEEDLINGS ---31 CHAPTER III CHARACTERIZATION OF POLYPEPTIDES THAT ACCUMUlATE IN CULTURED TOBACCO CEllS ---43 CHAPTER N MOLECULAR CLONING OF A eDNA FOR OSMOTIN­ UKE PROTEIN AND CHARACTERIZATION OF REGUlATION OF THE GENE Section 1 Structure of a eDNA for osmotin-like protein from cultured tobacco cells ---56 Section 2 Regulation of the gene expression of osmotin- like protein by ethylene ---64 CONCLUSIONS ---7 2 ACKNOWLEDG"MENTS ---76 REFERENCES ---77 INTRODUCTION ABBREVIATIONS Photoautotrophism is one of the most distinctive attributes of CAB chlorophyll a/ b-binding protein plant cells carried out by chloroplasts. There are few studies on CFl coupling factor 1 photosynthesis in plant cell culture systems, primarily because Chl chlorophyll chlorophyll levels are usually quite low. However if the proper 2,4-D 2, 4-dichlorophenoxy-acetic acid cells are selected and the culture system is properly manipulated, DCIP 2 ,6-dichlorophenol indophenol chloroplasts will develop along with the ability to perform DCMU 3-(3,4-dichloro-phenyl)-1,1-dimethyl-urea photosynthesis. Photoautotrophic growth of in vitro cultured 20-PAGE two dimensional polyacrylamide gel electrophoresis plant cells in a sugar-free medium but in the presence of COz­ EDT A ethylenediaminetetraacetic acid enriched air, was first achieved by Bergman in 1967 using tobacco HEPES 4-( 2-hydroxyethyl)-1-piperazineethanesufonic acid suspension cultures (Bergman 1967). Since then, more than 25 LDS-PAGE lithium dodecyl sulfate-polyacrylamide gel different plant species have been established, with the exception electrophoresis of Gramineae. LHC (I) polypeptides of the light-harvesting chlorophyll-protein Photoautotrophic (PA) plant cell suspension cultures simplify complex of PSI and LHC(TI) of PS II a complex plant organism to the cellular level with respect to its PA cells photoautotrophically cultured cells growth requirements and photosynthetic functions, including Pipes Piperazine-N,N'-bis(2-ethanesulfonic acid) plastid differentiation. This facilitates the use of photoautotrophic PM cells photomixotrophically cultured cells cell culture to study the cellular basis of photosynthesis in higher PS I photosystem I plants. This paper summarizes the present understanding of PS II photosystem II photoautotrophic culture and describes the nature of my recent PVDF polyvinylidene difluoride study. SDS sodium dedecyl sulfate Establishment of photoautotropbic cell culture and Tricine 2-hydroxymethyl-2-(N-glycine)-1,3-dihydroxy development of chloroplasts propane Many PA cultures have been established by using a Tris tris(hydroxymethyl)aminomethane relatively lengthy procedure: Heterotrophic (H) callus cultures are initiated from a part of a plant in sugar-containing media. Green portions are then selectively transferred and photomixotrophic (PM) cell suspension cultures which contain chloroplasts are 1 - initiated, The amount of sugar in the media is gradually reduced, Photosynthetic capacities of PA cells until the cells are incubated in media which lack sugar. However, Light reaction systems not all PA cultures have been initiated in this way, and many There are only a few reports on the light reaction systems in plant species could not be grmvn photoautotrophically. Most PA cultured cells (Sato et al. 1979, Dalton 1980). ln these reports, the cultures require COl levels of 1<ro or higher, as well as strong light photosynthetic capacity of the light reaction systems. on a Chl intensity (8,000-12,000 lux, 100-300 ~tE!mZ ! s) for growth. Their basis, as measured by OL evolution, were about 30 to 550 growth rates vary. Some cultures grow vvith a doubling time of flmole02 mgChlt h for PA cells, which is equivalent to the values two days (asparagus: Peel 1982) or four days (soy bean: Hom for most mature C3 plant leaves. However, on a fresh weight 1983, conon: Blair et al. 1988), while other requires more than basis, most PA cells have much lower rates of photosynthetic 02 three weeks to double (perwincle: Tyler et al. 1986, Hyoscyamus: evolution than leaves because of the lower Chl content of the PA Yasuda et al. 1980). cells. These PA cells have well-developed chloroplasts with Dark respiration internal membranes organized in many stacks of grana, while The rates of photosynthetic 02 evolution are affected by those plant cells which were cultured in sugar-containing media in the of dark respiratory 02 uptake, which, as measured by COl dark (H cells) contain amyloplasts which are heavily loaded with evolution, range from about 2 to 20 flmolCOL/ gFW/ h or 9 to 90 starch, and PM cells which were grown in the light contain flmolC02/ mgChllh for PA cells (Xu et al. 1988). Dark respiration chloroplasts with fewer grana. rates of mature leaves, as measured by COz evolution in the dark, The PA cells which contain chloroplasts with developed were reported to be about 0.3-3 flmolCOz/mZ/s, which can be thylakoid systems generally have higher levels of chlorophyll converted to a Chl basis of about 3.6-36 fllllOlCOz / mgChl/ h, than PM cells. However, most of the PA cells contain about 200 assuming a Chi content of about 300 mg/m2, and to a fresh weight flgChl/gFW or less, which is about one-tenth the level found in basis of 10.8-108 fllllOlCOdgFW/h, assuming a value of 100 leaves, although some cell lines (ex. SB-P, a soybean cell line: Hom gFW!mZ. Thus, the dark respiration rates are of the same order 1983) have about 1500-2000 flgChl/gFW, which is equivalent to on a Chi basis, while the rates of the cultured cells are lower if the chlorophyll content of leaves. In plant cell culture systems, calculated on a FW basis, although the difference was small however, there is no direct correlation between chlorophyll compared to that between the respective amounts of Chi on a FW content and growth rate or photosynthetic capadty (Widholm basis. 1992). Carbo~laaon reactions The light fixation rates of 14(X)z in PA cells, calculated as fllllOl CD2 fixed per mg Chi per hour, range from 9-28 for Amaranthus 2 - 3 - powellii (Xu et al. 1988) to 132 for Nicotiana rabacum (Nishida et On the other hand, the activities of RuBPCase in PA cultured al. 1980). The dark fLxation rates of COl on a Chl basis range from cells are much lower than those in leaves. Goldstein and Widholm 1.3 for Amaranthus cruenrus to 10 for Chenopodium rubrum, ( 1990) reported that in vivo activation levels of RuBPCase m PA which were 3-30o/o of the light COl fixation rates of the respective cultured cells were also lower than those in leaves. I'he} found PA cells (Xu et al. 1988). that if RuBPCase was extracted by conventional methods, i.e .. cells One of the remarkable characteristics of carbon fLxation in PA are taken directly from flasks under a relatively low light and PM cells is that high 14C labeling can be observed in c.~­ intensity {approximately 250 !!E/ m2, s), the activities prior to fixation products, such as aspartate and, in particular, malate, activation with high Mg++ and HC03- (initial activities) were only aside from Calvin cycle derivatives (Husemann et al. 1979, Nishida 16-56% of the activities after activation (total activities), while the et al. 1980, Sato et al. 1980, Seeni and Gnanam 1982). Moreover, initial activities of RuBPCase in leaf extracts were usually more in many PA cell culture systems, phosphoenolpyruvate than 90% of the total activities. However, Roeske et al. ( 1989) carboxylase ( PEPCase) activities were higher than ribulose 1 ,5- showed that the RuBPCase in PA cultures could be activated to bisphosphate carboxylase (RuBPCase) activities. In addition, the higher levels (93 to 94%) with a 5-min illumination prior to ratio of RuBPCase and PEPCase activities changes during the extracting RuBPCase. growth cycle; PEPCase activities, as well as the concentration of Many Studies have demonstrated that PA cultures perform PEPCase, are highest during the exponential growth phase, while photorespiration by showing that photosynthesis in PA cultures is the activities and concentration of RuBPCase decrease during that inhibited by increased Oz levels, that this inhibition can be phase. In contrast, PEPCase activities decrease and RuBPCase reversed by increasing C02. and that 14COz is incorporated into activities increase during the stationary phase (Nato et al. 1985 ). glycine and serine (Sato et al. 1979, Roeske et al. 1989, Rey et al. Since most PA cells have higher levels of PEPCase, on a Chl 1990). basis, than leaves and the activities are higher during the COL compensation points exponential phase when the respiration rate is high and cells are Most photosynthetic cultures require COz-enriched air (1-2%, actively dividing and synthesizing structural components, PEPCase v/ v) for growth. This might be explained by a low carbonic is believed to feed carbon to the tricarboxylic acid cycle for the anhydrase activity, which, by catalyzing the dehydration of production of amino acid, and may be involved in the other bicarbonate, could reduce the availability of COz as a fixation biosyntheses which would be needed during this phase substrate (Tsuzuki et al. 1981). However, a cotton cell line which (anaplerotic COl fixation) (Nishida et al. 1980, Sato et al. 1980, can grow under ambient C02 levels was recently established. Roger 1987, Sato et al.
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