Showing papers in "Plant Science in 2001"

TL;DR: Plant cell culture technologies were introduced at the end of the 1960s as a possible tool for both studying and producing plant secondary metabolites, and it is now possible to manipulate the pathways that lead to secondary plant compounds.

TL;DR: It is suggested that Cd induces oxidation stress in growing rice plants and that SOD and peroxidase could serve as important components of antioxidant defense mechanisms in rice to combat metal induced oxidative injury.

TL;DR: In this paper, a review of the involvement of active oxygen species (AOS) in stress signal transduction in plants, guided by a summary of work performed in our laboratory on plants that are deficient in catalase activity, is presented.

TL;DR: It is indicated that thermal stress induces the accumulation of phenolics in the plant by activating their biosynthesis as well as inhibiting their oxidation, which could be considered an acclimation mechanism of the plant against thermal stress.

TL;DR: The results suggest that leaf senescence in general and earlysenescence of early cv.

TL;DR: After salt stress, oxidative enzymes were altered in mulberry and the extent of alteration varied between the cultivar S1 and ATP, leading to the higher amounts of antioxidative enzymes in S1 supporting its salt tolerance.

TL;DR: The results show that at both developmental stages barley seedlings exhibit a well-defined activity of the enzymatic antioxidant system, which operates differentially in roots and shoots subjected to Cd stress.

TL;DR: Growing seedlings in seedbeds with saline media could be of interest to better tolerate further salty conditions in the field or greenhouse and in relation to salt tolerance.

TL;DR: Analysis of a sugarcane (Saccharum spp.) EST (expressed sequence tag) library of 8678 sequences revealed approximately 250 microsatellite or simple sequence repeats (SSRs) sequences that showed a significantly higher level of polymorphism when applied to progenitor and related genera.

TL;DR: The results suggest that copper alters the equilibrium between synthesis and utilization of GSH either due to its antioxidant role or by serving as a precursor in the synthesis of phytochelatins.

TL;DR: New functional genomics approaches such as reverse genetics, microarray analyses coupled with in vivo protein-protein interaction studies and proteomics should not only permit functional analysis of various components in Ca(2+) signaling but also enable identification of a complex network of interactions.

TL;DR: It was found that Lemna fronds were able to accumulate both cadmium and copper, but Cu- treated material showed pronounced toxic symptoms at concentrations 1000-fold lower in comparison to Cd, while in Cu-treated fronds neither accumulation of existing proteins nor appearance of any extra protein was observed.

TL;DR: Pepper (Capsicum annuum L.) plants growing in a nutrient solution with excess copper, showed an increase in shikimate dehydrogenase and peroxidase activities in the hypocotyl, and the role of these enzymes in phenolic metabolism under heavy metal stress is discussed.

TL;DR: The capacity of OA was greater in growing than in expanded leaves, especially in the two cultivars best adapted to aridity, and allowed turgor maintenance in these genotypes and in young expanded and growing leaves harvested at the end of the stress treatment.

TL;DR: The phenotypic change from white to red in the sports is thought to be the result of a mutation in a regulatory gene controlling the expression of UFGT.

TL;DR: expression of the ADC transgene under the control of an ABA-inducible promoter led to stress-induced upregulation of ADC activity and polyamine accumulation in transgenic rice plants.

TL;DR: The ion interaction study revealed significant modifying effect of Ca(2+), and also of Mg(2+) and K(+), on the changes induced by Na(+) in the activity of catalase and SOD suggesting that relative build-up of these ions inside cells could be of much importance in regulation of synthesis of antioxidative enzymes.

TL;DR: Pretreatment with exogenously added polyamines showed that Spm reverted the effect of Cd 2+ and Cu 2+ on lipid peroxidation almost to control values, but more research is necessary to elucidate the precise role they played as antioxidants.

TL;DR: A PR-3 rice chitinase gene (RC7), isolated from R. solani-infected rice plants, was introduced into indica rice cultivars IR72, IR64, IR68899B, MH63, and Chinsurah Boro II by the biolistic and PEG-mediated transformation system and showed different levels of enhanced resistance when challenged with the sheath blight pathogen R.solani.

TL;DR: High correlation between SOD activity and the F(v)/F(m )ratio under both PEG induced water stress and MV-mediated oxidative stress was observed, suggesting that SOD can protect PSII from superoxide generated by oxidative and water stress.

TL;DR: The results demonstrated that MeJA and MeSA induced the accumulation of sHSP transcripts in tomato, and the increased transcript abundance of HSPs, especially class II sH SPs, was correlated with protection against CI.

TL;DR: Proline accumulation induced by excess Cu was related to proteolysis and an increase in Delta(1)-pyrroline-5-carboxylate reductase or ornithine-delta-aminotransferase activity and could not be explained by proline utilization or stress-induced modifications in proline dehydrogenase.

TL;DR: It is shown that peanut plants containing transgenically increased activity of chitinase were resistant to attack by the fungal pathogen C. arachidicola to different degrees and may be useful for the control of other fungal diseases of the crop.

TL;DR: The contributions of recently identified symporter proteins to solute transfer are reviewed here, as is the role of apoplastic invertases in promoting solute assimilation.

TL;DR: The results suggest that increased exudation of OA(-) due to P deficiency is associated with H(+) extrusion but contributes only a part of total acidification.

TL;DR: Cell wall stiffening catalyzed by POD is possibly involved in the regulation of root growth reduction caused by ABA.

TL;DR: It was suggested that the ionic component by itself might trigger short-term polyamine accumulation and this effect might be attributed to monovalent ions, although K+ and Na+ accumulation had different effects on polyamine content.

TL;DR: The ligand-binding ability of this lectin, correlated with the insecticidal property, facilitated to ascertain the mode of action of the particular lectin on above mentioned insects physiology and opens up the possibility of using garlic leaf lectin as a potent control agent to engineer crop plants for insect resistance.

TL;DR: The recently solved crystal structure of the maize enzyme and its implications for the substrate binding and catalytic mechanism and the potential roles for PAO-generated H(2)O( 2) in lignin biosynthesis and cell wall cross-linking reactions, which may regulate growth and contribute to cell defence, are discussed.

TL;DR: Results demonstrated the usefulness of MSAP to detect DNA methylation events in micropropagated banana plants and indicate thatDNA methylation polymorphisms are associated with micropropagsation.