全文获取类型
收费全文 | 132篇 |
免费 | 2篇 |
出版年
2020年 | 2篇 |
2018年 | 1篇 |
2017年 | 1篇 |
2016年 | 1篇 |
2013年 | 4篇 |
2011年 | 3篇 |
2009年 | 6篇 |
2008年 | 2篇 |
2007年 | 3篇 |
2006年 | 6篇 |
2005年 | 8篇 |
2004年 | 9篇 |
2003年 | 11篇 |
2002年 | 4篇 |
2001年 | 11篇 |
2000年 | 3篇 |
1999年 | 8篇 |
1998年 | 8篇 |
1997年 | 7篇 |
1996年 | 4篇 |
1995年 | 4篇 |
1994年 | 2篇 |
1993年 | 1篇 |
1992年 | 1篇 |
1991年 | 2篇 |
1990年 | 1篇 |
1989年 | 3篇 |
1988年 | 2篇 |
1987年 | 2篇 |
1985年 | 2篇 |
1984年 | 2篇 |
1983年 | 1篇 |
1982年 | 2篇 |
1981年 | 1篇 |
1980年 | 2篇 |
1979年 | 1篇 |
1978年 | 1篇 |
1977年 | 2篇 |
排序方式: 共有134条查询结果,搜索用时 31 毫秒
21.
Peanut Photosynthesis Under Drought and Re-Watering 总被引:2,自引:0,他引:2
The photosynthetic response of three Arachis hypogaea L. cultivars (57-422, 73-30, and GC 8-35) grown for two months was measured under water available conditions, severe water stress, and 24, 72, and 93 h following re-watering. At the end of the drying cycle, all the cultivars reached dehydration, relative water content (RWC) ranging between 40 and 50 %. During dehydration, leaf stomatal conductance (g
s), transpiration rate (E), and net photosynthetic rate (P
N) decreased more in cvs. 57-422 and GC 8-35 than in 73-30. Instantaneous water use efficiency (WUEi) and photosynthetic capacity (P
max) decreased mostly in cv. GC 8-35. Except in cv. GC 8-35, the activity of photosystem 1 (PS1) was only slightly affected. PS2 and ribulose-1,5-bisphosphate carboxylase/oxygenase (RuBPCO) were the main targets of water stress. After re-watering, cvs. 73-30 and GC 8-35 rapidly regained g
s, E, and P
N activities. Twenty-four hours after re-watering, the electron transport rates and RuBPCO activity strongly increased. P
N and P
max fully recovered later. Considering the different photosynthetic responses of the studied genotype, a general characterisation of the interaction between water stress and this metabolism is presented. 相似文献
22.
Effects of salt stress on basic processes of photosynthesis 总被引:6,自引:0,他引:6
Salt stress causes decrease in plant growth and productivity by disrupting physiological processes, especially photosynthesis. The accumulation of intracellular sodium ions at salt stress changes the ratio of K : Na, which seems to affect the bioenergetic processes of photosynthesis. Both multiple inhibitory effects of salt stress on photosynthesis and possible salt stress tolerance mechanisms in cyanobacteria and plants are reviewed.This revised version was published online in March 2005 with corrections to the page numbers. 相似文献
23.
Three-year-old plants of Parthenium argentatum Gray cv. 11591 grown under natural photoperiod were exposed for 60 d to low night temperature (LNT) of 15 °C (daily from
18:00 to 06:00). Effects of the treatment on net photosynthetic rates (P
N), rubber accumulation, and associated biochemical traits were examined. LNT initially reduced P
N with a parallel decline in the activities of ribulose-1,5-bisphosphate carboxylase, fructose bisphosphatase, and sucrose
phosphate synthase for 20–30 d. Later, LNT enhanced P
N and the activities of photosynthetic enzymes. Associated with high P
N in LNT-treated guayule plants was a two-fold increase in rubber content and rubber transferase activity per unit of protein.
The initial decrease in P
N in LNT-treated guayule was associated with low content of chlorophyll (a+b), large starch accumulation, and higher ratio of glucose-6-phosphate/fructose-6-phosphate. Photosystem 2 activity in isolated
chloroplasts was initially decreased, but increased after 30 d. There was a significant increase in the leaf soluble protein
content in LNT-treated plants. Hence the photosynthetic performance of plants grown at 15 °C night temperature for 50 d was
superior to those grown under natural photoperiod in all parameters studied. The high photosynthetic capacity may contribute
to superior rubber yields under LNT.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
24.
Effects of NaCl Stress on the Structure,Pigment Complex Composition,and Photosynthetic Activity of Mangrove Bruguiera parviflora Chloroplasts 总被引:7,自引:1,他引:6
Exposure of two-month-old seedlings of Bruguiera parviflora to NaCl stress (0 to 400 mM) for 45 d under hydroponic culture caused notable disorganisation of the thylakoid structure
of chloroplasts in NaCl-treated leaves as revealed from transmission electron microscopy. The absorption spectra of treated
and control thylakoid samples were similar having a red peak at 680 nm and Soret peaks at 439 and 471 nm in the blue region
of the spectrum. The spectra of treated samples differed from control samples by gradual decrease in absorbance of 100, 200,
and 400 mM NaCl treated samples at 471 and 439 nm, which could be due to scattering of radiation in these samples. Thus, absorption
characteristics of thylakoid membranes indicated no major alterations in the structural integrity of the photosynthetic membranes
during salt stress in B. parviflora. Analysis of pigment protein complexes of thylakoids on non-denaturing gel showed that CP1 complex consisting of photosystem
(PS) 1 reaction centre decreased marginally by 19% and the CP47 constituting the core antenna of PS2 declined significantly
by 30% in 400 mM NaCl treated samples in respect to control. This decrease in structural core antenna might cause inefficient
photon harvesting capacity. However, CP43 content did not alter. An increase in CP2/CP1 ratio from 3.2 in control to 4.0 in
400 mM NaCl treated samples indicated significant structural changes in the thylakoids of salt treated plants. Haem staining
of thylakoids revealed significant losses in cytochrome (Cyt)f and Cyt b
6 contents by NaCl stress. However, Cyt b
559 content remained nearly constant in both control and NaCl treated samples. SDS-PAGE of thylakoid proteins showed that the
intensity of many of Coomassie stained polypeptide bands ranging from 15–22 and 28–66 kDa regions decreased significantly
in NaCl treated samples as compared to control. Electron transport activity of thylakoids, measured in terms of DCPIP photoreduction,
was 22% lower in 400 mM NaCl treated plants than in the control ones. Hence, NaCl induces oxidative stress in chloroplasts
causing structural alterations in thylakoids. These structural alterations might be responsible for declined efficiency of
photosystems and reduced electron transport activity.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
25.
Lauriano J.A. Campos P.S. Ramalho J.C. Lidon F.C. Guedes M.E. do Céu Matos M. 《Photosynthetica》1997,33(1):81-90
Photosynthetic capacity (PC) of three peanut cultivars (Arachis hypogaea L. cvs. 57-422, 73-30, and GC 8-35) decreased during drought stress (decline in relative water content from ca. 95 to 70 %) and recovered two days after rewatering. Mild water stress was not limiting for the total ribulose-1,5-bisphosphate
carboxylase/oxygenase activity, since this enzyme activity increased under drought. Photosystem (PS) 2 and PS1 (the latter
only in cv. GC 8-35) electron transport activities decreased under drought. The ratio of the variable to maximal chlorophyll
fluorescence (Fv/Fm) decreased mainly in the cv. GC 8-35. All cultivars showed decreases in photochemical quenching (qP) and
quantum yield of PS2 electron transport (Φe). Increase of basal fluorescence (F0) was observed in the cvs. 73-30 and GC 8-35,
while the cv 57-422 showed a decrease. After rewatering a sharp increase was observed in the majority of the parameters. Thus
under the present stress conditions, the cv GC 8-35 was the most affected for all the parameters under study. The cv. 57-422
showed a higher degree of tolerance being gradually affected in photosynthetic capacity (PC) in contrast to the two other
cvs. which showed a sharp decrease in PC at the beginning of the drought cycle.
This revised version was published online in September 2006 with corrections to the Cover Date. 相似文献
26.
Analysis of the chloroplast protein complexes by blue-native polyacrylamide gel electrophoresis (BN-PAGE) 总被引:5,自引:0,他引:5
Kügler Marion Jänsch Lothar Kruft Volker Schmitz Udo K. Braun Hans-Peter 《Photosynthesis research》1997,53(1):35-44
Blue-native polyacrylamide gel electrophoresis (BN-PAGE) is a powerful procedure for the separation and characterization of the protein complexes from mitochondria. Membrane proteins are solubilized in the presence of aminocaproic acid and n-dodecylmaltoside and Coomassie-dyes are utilized before electrophoresis to introduce a charge shift on proteins. Here, we report a modification of the procedure for the analysis of chloroplast protein complexes. The two photosystems, the light-harvesting complexes, the ATP synthase, the cytochrome b
6
f complex and the ribulose-bisphosphate carboxylase/oxygenase are well resolved. Analysis of the protein complexes on a second gel dimension under denaturing conditions allows separation of more than 50 different proteins which are part of chloroplast multi-subunit enzymes. The resolution capacity of the blue-native gels is very high if compared to 'native green gel systems' published previously. N-terminal amino acid sequences of single subunits can be directly determined by cyclic Edman degradation as demonstrated for eight proteins. Analysis of chloroplast protein complexes by blue-native gel electrophoresis will allow the generation of 'protein maps' from different species, tissues and developmental stages or from mutant organelles. Further applications of blue-native gel electrophoresis are discussed. 相似文献
27.
A unified multibranched chlorophyll (Chl) biosynthetic pathway is proposed. The proposed pathway takes into account the following
considerations: (a) that the earliest putative precursor of monovinyl Chl b that has been detected in higher plants is monovinyl
protochlorophyllide b, (b) that in most cases, Chl b biosynthesis has its roots in the Chl a biosynthetic pathway, (c) that
the Chl a biosynthetic pathway exhibits extensive biosynthetic heterogeneity, (d) that Chl biosynthesis may proceed differently
at different stages of greening and in different greening groups of plants. Integration of the Chl a and b biosynthetic pathways
into a unified multibranched pathway offers the functional flexibility to account for the structural and biosynthetic complexity
of photosynthetic membranes. In this context, it is proposed that the unified, multibranched Chl a/b biosynthetic pathway
represents the template of a Chl-protein biosynthesis center where photosystem (PS) 1, PS2, and light-harvesting Chl-protein
complexes are assembled into functional photosynthetic units. The individual biosynthetic routes or groups of two to three
adjacent biosynthetic routes may constitute Chl-protein biosynthesis subcenters, where specific Chl-protein complexes are
assembled.
This revised version was published online in September 2006 with corrections to the Cover Date. 相似文献
28.
We studied the development of chloroplasts from etioplasts in the cotyledonary leaves of 4-d-old dark-grown cucumber (Cucumis
sativus) seedlings after irradiation (20 μmol m-2 s-1). Upon irradiation, the triggering of chlorophyll (Chl) synthesis and accumulation showed a relatively short lag phase. The
irradiation of etiolated seedlings initiated the synthesis of apoproteins of pigment-protein complexes. While Chl-protein
2 (CP2) was detected at 6 h after irradiation, CP1 only after 29 h. The appearance and accumulation of some of the apoproteins
were monitored by Western-blotting. LHC2 apoprotein was detected after a 6 h-irradiation. The amounts of D1 protein of photosystem
(PS) 2 and PsaA/B protein of PS1 were quantitated by ELISA. Further, the thylakoid membrane function during this time period
in terms of PS1- and PS2-mediated electron transfer activity and intersystem electron pool size were analyzed. While PS1 activity
was detected after 4 h, PS2-mediated O2 evolution was detected only after a 17 h-irradiation. Fv/Fm value of Chl a fluorescence measurements indicated that the photochemical efficiency of these leaves reached its maximum
after 29 h of irradiation. The intersystem pool size of cotyledonary leaves was equivalent to that of the control cotyledonary
leaves grown for 25 h under continuous irradiation. Thus etioplasts develop into fully functional chloroplasts after approximately
25 h when 4 d-dark grown cucumber seedlings are continuously moderately irradiated. The development of photosynthetic electron
transport chain seems to be limited in time at the level of PS2, possibly at the donor side.
This revised version was published online in September 2006 with corrections to the Cover Date. 相似文献
29.
Cd/Fe Interaction in Higher Plants - Its Consequences for the Photosynthetic Apparatus 总被引:6,自引:0,他引:6
Cadmium is one of the most dangerous environmental pollutants, affecting, among other things, plant mineral composition. It
easily interacts with iron, one of the most important elements for plant growth and metabolism. This interaction, including
modifying effects of lowered or excessive Fe supply on Cd-exposed plants and its consequences for the photosynthetic apparatus
is reviewed. The influence of modified Fe and Cd supply on the uptake of both metals, their distribution, plant growth, and
photosynthesis is also explained. Moderate Fe excess has a beneficial influence on Cd-treated plants, resulting in more intensive
growth, photosynthetic pigments accumulation, and more efficient light phase of photosynthesis. Nutrient-medium Fe deficiency
increases plant susceptibility to Cd. The main open questions of Cd/Fe interaction are: (1) the strong Fe-dependency of Cd
mobility within the plant, and (2) photosynthetic dark phase adaptation to Cd stress.
This revised version was published online in June 2006 with corrections to the Cover Date. 相似文献
30.
Lars Olof Björn George C. Papageorgiou Robert E. Blankenship Govindjee 《Photosynthesis research》2009,99(2):85-98
Chlorophyll a (Chl a) serves a dual role in oxygenic photosynthesis: in light harvesting as well as in converting energy of absorbed photons to
chemical energy. No other Chl is as omnipresent in oxygenic photosynthesis as is Chl a, and this is particularly true if we include Chl a
2, (=[8-vinyl]-Chl a), which occurs in Prochlorococcus, as a type of Chl a. One exception to this near universal pattern is Chl d, which is found in some cyanobacteria that live in filtered light that is enriched in wavelengths >700 nm. They trap the
long wavelength electronic excitation, and convert it into chemical energy. In this Viewpoint, we have traced the possible reasons for the near ubiquity of Chl a for its use in the primary photochemistry of Photosystem II (PS II) that leads to water oxidation and of Photosystem I (PS
I) that leads to ferredoxin reduction. Chl a appears to be unique and irreplaceable, particularly if global scale oxygenic photosynthesis is considered. Its uniqueness
is determined by its physicochemical properties, but there is more. Other contributing factors include specially tailored
protein environments, and functional compatibility with neighboring electron transporting cofactors. Thus, the same molecule, Chl a in vivo, is capable of generating a radical cation at +1 V or higher (in PS II), a radical anion at −1 V or lower (in PS
I), or of being completely redox silent (in antenna holochromes).
相似文献
Govindjee (Corresponding author)Email: |