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Interaction of enriched CO2 and water stress on the physiology of and biomass production in sweet potato grown in open-top chambers 总被引:2,自引:2,他引:0
N. C. BHATTACHARYA D. R. HILEMAN P. P. GHOSH R. L. MUSSER S. BHATTACHARYA P. K. BISWAS 《Plant, cell & environment》1990,13(9):933-940
Abstract. The objective of this study was to investigate the effects of water stress in sweet potato ( Ipomoea batatas L. [Lam] 'Georgia Jet') on biomass production and plant-water relationships in an enriched CO2 atmosphere. Plants were grown in pots containing sandy loam soil (Typic Paleudult) at two concentrations of elevated CO2 and two water regimes in open-top field chambers. During the first 12 d of water stress, leaf xylem potentials were higher in plants grown in a CO2 concentration of 438 and 666 μmol mol−1 than in plants grown at 364 μmol mol−1 . The 364 μmol mol−1 CO2 grown plants had to be rewatered 2 d earlier than the high CO2 -grown plants in response to water stress. For plants grown under water stress, the yield of storage roots and root: shoot ratio were greater at high CO2 than at 364 μmol mol−1 ; the increase, however, was not linear with increasing CO2 concentrations. In well-watered plants, biomass production and storage root yield increased at elevated CO2 , and these were greater as compared to water-stressed plants grown at the same CO2 concentration. 相似文献
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S. B. KAUSIK F.L.S. S. S. BHATTACHARYA 《Botanical journal of the Linnean Society. Linnean Society of London》1971,64(1):97-104
The occurrence of Tolypella (Characeae) in Libya is recorded for the first time. Also for the first time, the structural development of the male and female fructifications (the globule (antheridium) and the nucule (oogonium) respectively) in Tolypella nidifca (O. Müll.) A.Br. is described. Both the globule and the nucule show the same course of development as is seen in Chara. In the final structure of the globule, however, there are two stalk cells in Tolypella , while only a single cell is present in Chava and Nitella. The corona has ten cells in two tiers of five each, as in Nitella , but in Chara there is only a single tier of five cells forming the corona. 相似文献
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KALIPADA KAR KRISHNA MUKERJI KSHUDIRAM NASKAR AMAL BHATTACHARYA DILIP KUMAR GHOSH 《The Journal of eukaryotic microbiology》1990,37(4):277-279
A chemically defined medium using commercially available α-MEM supplemented with HEPES, L-glutamine, D-glucose, folic acid, D-biotin and adenine supports the luxuriant growth and propagation of Leishmania donovani promastigotes. A peak parasite population of about 7.0 × 107/ml at stationary phase and a population doubling time of 11.4 h for high-subpassage promastigotes were obtained. The medium was suitable for transformation of isolated amastigotes from infected hamster spleen. Promastigotes could be detected by culturing kala-azar patients’bone-marrow aspirate or spleen puncture material in this medium. Four out of six freshly transformed isolates gradually adapted and grew well in this medium. Macroscopic colonies appeared on agar plates prepared with the medium within 16–20 days after inoculation. The cloning efficiency was increased about five-fold by glycerol supplementation. 相似文献
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GOPAL SRIVASTAVA MONIKA TOLA ANAND SUDHA BHATTACHARYA ALOK BHATTACHARYA 《The Journal of eukaryotic microbiology》1995,42(5):617-622
ABSTRACT. Lipophosphoglycan has recently been demonstrated on the cell surface of Entamoeba histolytica strain HM-1:IMSS. A monoclonal antibody against this molecule had failed to react with some other strains of E. histolytica, including the strain Rahman. To determine if a structurally distinct lipophosphoglycan existed in Rahman, [3H]galactose-labeled glycoconjugates were electrophoresed through sodium dodecyl sulfate polyacrylamide gel electrophoresis. The electrophoretic pattern in Rahman was very different compared to that obtained with strains HM-1:IMSS and 200:NIH. A number of experiments including sensitivity to mild acid, nitrous acid and phosphoinositol-specific phospholipase C suggest that the Rahman glycoconjugate is indeed a lipophosphogylcan-like molecule but distinctly different from that of HM-1:IMSS. Mild acid-treated glycoconjugates from Rahman and HM-1:IMSS revealed the presence of neutral trisaccharides and monosaccharides in Rahman but not in HM-1:IMSS. Human immune sera from amoebiasis patients and a polyclonal antibody against HM-1:IMSS liphophosphoglycan both recognized Rahman glycoconjugate. Thus, while lipophosphoglycan molecules from the two strains share common epitopes, they are clearly distinct from each other. Molecules bearing resemblance to lipophosphoglycan could not be detected in other Entamoeba species, namely Entamoeba invadens and Entamoeba moshkovskii. 相似文献
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Phenolics are aromatic benzene ring compounds with one or more hydroxyl groups produced by plants mainly for protection against stress. The functions of phenolic compounds in plant physiology and interactions with biotic and abiotic environments are difficult to overestimate. Phenolics play important roles in plant development, particularly in lignin and pigment biosynthesis. They also provide structural integrity and scaffolding support to plants. Importantly, phenolic phytoalexins, secreted by wounded or otherwise perturbed plants, repel or kill many microorganisms, and some pathogens can counteract or nullify these defences or even subvert them to their own advantage. In this review, we discuss the roles of phenolics in the interactions of plants with Agrobacterium and Rhizobium. 相似文献
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WE have shown that induction of the enzyme L-arabinose isomerase in Salmonella typhimurium ceases following infection with the bacteriophage P22 leading to lysis, whereas with infection leading to lysogeny there is a temporary inhibition of induction after which the synthesis of the enzyme begins again1. After infection, there is a transient depression of the overall rate of RNA and protein synthesis1. This phenomenon is similar to that observed in T-even phage and λ-infected E. coli2–5. Arguments for and against the involvement of phage genes2–12 in such phenomena have been put forward. We now present evidence to suggest that the sie gene of phage P22 is involved in the inhibition of host macromolecular synthesis. 相似文献
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Exogenously supplied nitrogenous bases in combination with IAA + sucrose hastened the formation of roots on hypocotyl cuttings of Phaseolus mungo L. cv. G31. While purine and pyrimidine bases had little effect when used alone, together with IAA or sucrose they increased the number of roots and the effect was even more pronounced in combination with (IAA + sucrose). By contrast, guanine inhibited rooting completely in higher concentrations even in combination with (IAA + sucrose), and cuttings died within 48–72 h. 相似文献