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Journal ArticleDOI

Growth and metabolism of germinating rice (Oryza sativa L.) seeds as influenced by toxic concentrations of lead

01 Jan 1977-Zeitschrift für Pflanzenphysiologie (Urban & Fischer)-Vol. 81, Iss: 1, pp 26-33
TL;DR: It was apparent that reduced growth was associated with increased enzyme activity, probably due to an enhanced protein synthesis, and the activity of catalase, peroxidase, IAA oxidase, and ascorbic acid oxidase incresed in response to lead addition.
About: This article is published in Zeitschrift für Pflanzenphysiologie.The article was published on 1977-01-01. It has received 44 citations till now. The article focuses on the topics: Ascorbic acid & Lead acetate.
Citations
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Book ChapterDOI
01 Jan 2019
TL;DR: This chapter discusses that auxin functions as a hub, which integrates genetic and environmental information to achieve the appropriate physiological and developmental response of plants, and targeting various auxin signaling components might be a potential strategy to enhance plant tolerance to abiotic stress.
Abstract: Auxin influences a variety of developmental and physiological processes in plants. Recently, much progress has been made to understand the role of auxin under various abiotic stresses. Rapid alteration in plant root architecture in response to abiotic stress is achieved largely through auxin. Various auxin signaling components exist in plants, which mediate diverse physiological and developmental plant processes under various stresses. This chapter covers auxin production, transport, and signal transduction in response to abiotic stresses such as heavy metal stress, nutrient deficiency, drought, salinity, and temperature stress. It discusses that auxin functions as a hub, which integrates genetic and environmental information to achieve the appropriate physiological and developmental response of plants. Therefore, targeting various auxin signaling components might be a potential strategy to enhance plant tolerance to abiotic stress.

11 citations

Journal ArticleDOI
TL;DR: In this article, the effects of heavy metal ionation on the root and shoot extension of lettuce seedlings have been studied and the results are discussed in terms of their possible significance to heavy metal effects on plant growth.

11 citations

Journal ArticleDOI
TL;DR: The results indicated that the Pb bioaccumulation factor for little seed canary grass was <1, indicating that it is a Pb excluding plant.
Abstract: We investigated the effectiveness of Nitroxin inoculation on lead (Pb) and nutrient uptakes by little seed canary grass. The factors tested included inoculation (or not) with Nitroxin and different soil concentrations of Pb (0, 200, 400 and 800mgPbkg-1 soil). Increasing soil concentrations of Pb decreased stem, leaf and root dry weights. Shoot phosphorus concentrations increased in parallel with increasing soil Pb concentrations. Nitroxin inoculation did not alter the phosphorus concentration of the roots. The Pb translocation factor was >1 in inoculated treatments in the Pb soil concentration range of 200 to 400mgkg-1; the translocation factor for 800mgPbkg‑1 with no inoculation of Nitroxin was, however, <1. Our results indicated that the Pb bioaccumulation factor for little seed canary grass was <1, indicating that it is a Pb excluding plant.

11 citations


Cites background from "Growth and metabolism of germinatin..."

  • ...Mukherji & Maitra (1977) and Carlson et al. (1976) similarly reported inhibitory effects of Pb on cereal crops and other plants....

    [...]

Journal ArticleDOI
TL;DR: Investigation of the influence of a wide range of concentrations of lead on the growth and development of Raphanus sativus found root extension offered the most sensitive reflection of lead toxicity over a range of lead concentrations, although effects were also seen on the development of root hairs and secondary roots.

11 citations

Journal ArticleDOI
TL;DR: Germination decreased with elevated zinc levels but differences between different seedlots were not found, and Radicle elongation was more adversely affected than hypocotyl extension.

10 citations

References
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Journal Article
TL;DR: Procedures are described for measuring protein in solution or after precipitation with acids or other agents, and for the determination of as little as 0.2 gamma of protein.

289,852 citations

Journal ArticleDOI
TL;DR: During a study of the inactivation of IAA in aqueous solutions, it was frequently necessary to assay at one time many samples where the IAA concentrations were low, or where the degree of significance of small differences in concentrations between experimental unite required evaluation, so it was desirable to re-examine the ferric chloride-sulphuric acid procedure.
Abstract: The wide use of the auxin, indoleacetic acid, in physiological and biochemical experiments has promoted interest in methods for its colorimetrie estimation. Mitchell and Brunstetteb (1) have proposed both the nitrite and the ferric chloride-sulphuric acid tests for the quantitative estimation of indoleacetic acid (IAA) in aqueous solutions, basing their suggested procedures upon a study of optimal reaction conditions for these two reagents. According to them, the nitrite method is sensitive to 10 /tig. IAA/ml. and develops a red color that is stable after two hours. In several attempts to duplicate their nitrite method using solutions of IAA varying from 20 to 45 /tg./ml., we could not obtain a stable red color with IAA at the two hours proposed, or at any other time. A faint pink develops almost immediately which rapidly fades to orange or yellow, depending on IAA concentrations, within i hour. If the concentration of nitrite is reduced, the red color becomes sufficiently persistent to be read. Indole likewise gives a strong, relatively stable, red color in this test (cf. table II)?a reaction which is sometimes used as a qualitative test for indole (Nitroso-Indole reaction). Tang and Bonner (2) have modified the ferric chloride-sulphuric acid method for IAA, combining the iron and sulphuric acid as a single reagent to yield improved sensitivity. However, the color produced is also unstable, rapidly developing and then fading. We have found, as have these workers, that the fading color can be practically dealt with by adopting a standard time between addition of reagent and reading of absorbancy or transmittance. Both of the methods discussed above possess disadvantages, lacking either specificity, sensitivity, or stability of color complex formed. During a study of the inactivation of IAA in aqueous solutions, it was frequently necessary to assay at one time many samples where the IAA concentrations were low, or where the degree of significance of small differences in concentrations between experimental unite required evaluation. Hence, we considered it desirable 'to re-examine the ferric chloride-sulphuric acid procedure. Several alterations have been made which produce a more stable color, of increased specificity, which changes in density more rapidly with variation in IAA concentration. 1. The procedure of Tang and Bonner can be improved somewhat by reading at 15 minutes after addition of reagent (instead of 30 minutes as they suggest), since the transient color reaches a maximum at the former time. Maximum absorption was found to occur at 530 ???.

1,988 citations

Journal ArticleDOI
01 Jul 1957-Nature
TL;DR: It is shown that on similar waste tips in Scotland, A. tenuis is replaced by Festuca ovina and Deschampsia flexuosa, and a method has been worked out for the measurement of lead tolerance in F. ovina from soils of different lead contents.
Abstract: BRADSHAW reported1 that root growth was inhibited when plants of Agrostis tenuis were grown in soil from the tip of an old Welsh lead mine, while plants originally growing on the tip produced normal roots. This suggested that some plants of A. tenuis were inherently more tolerant of the lead and zinc in the soil than others. On similar waste tips in Scotland, A. tenuis is replaced by Festuca ovina and Deschampsia flexuosa, and a method has been worked out for the measurement of lead tolerance in F. ovina from soils of different lead contents.

306 citations

Journal ArticleDOI
21 Mar 1969-Science

217 citations