Journal ArticleDOI
Ability of bacterium Bacillus subtilis to produce cytokinins and to influence the growth and endogenous hormone content of lettuce plants
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TLDR
ZR was shown to be the main cytokinin present in bacterial cultural media as a complex with a high molecular weight component and was associated with an increase in plant shoot and root weight of approximately 30% over 8 days after inoculation.Abstract:
Hormone production by micro-organisms selected as antagonists of pathogenic fungi and the effect of their introduction into soil on hormone content and growth of lettuce plants were studied. Hormones in bacterial cultural media and in plant extracts were immunopurified and assayed using specific antibodies to indolyl-3-acetic acid (IAA), abscisic acid (ABA), and different cytokinins (zeatin riboside (ZR), dihydrozeatinriboside (DHZR) and isopentenyladenosine (iPA)). ZR was shown to be the main cytokinin present in bacterial cultural media as a complex with a high molecular weight component. Inoculation of lettuce plants with bacteria increased the cytokinin content of both shoots and roots. Accumulation of zeatin and its riboside was greatest in roots shortly 2 days after inoculation, when their content was 10 times higher than in control. Changes in the content of other hormones (ABA and IAA) were observed at the end of experiments only. Accumulation of cytokinins in inoculated lettuce plants was associated with an increase in plant shoot and root weight of approximately 30% over 8 days.read more
Citations
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Agriculture, Forestry and Fisheries
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Journal ArticleDOI
Bacillus subtilis biofilm induction by plant polysaccharides
TL;DR: It is demonstrated that B. subtilis root attachment depends on production of an extracellular matrix that holds the cells together in multicellular communities termed biofilms, and it is found that plant polysaccharides act as an environmental cue that triggers biofilm formation by the bacterium.
References
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Journal ArticleDOI
Spectrophotometric characteristics of chlorophylls a and b and their pheophytins in ethanol.
TL;DR: The absorption spectra of chlorophylls a and b in 96% ethanol, and of pheophytins a andb in 80% ethanol-0.01 N hydrochloric acid have been determined in comparison with known absorption coefficients.
Journal ArticleDOI
Cytokinin-Deficient Transgenic Arabidopsis Plants Show Multiple Developmental Alterations Indicating Opposite Functions of Cytokinins in the Regulation of Shoot and Root Meristem Activity
TL;DR: The results are consistent with the hypothesis that cytokinins have central, but opposite, regulatory functions in root and shoot meristems and indicate that a fine-tuned control of catabolism plays an important role in ensuring the proper regulation of cytokinin functions.
Book ChapterDOI
The Plant Hormones: Their Nature, Occurrence, and Functions
TL;DR: Plant hormones are a group of naturally occurring, organic substances which influence physiological processes at low concentrations, mainly of growth, differentiation and development, though other processes, such as stomatal movement, may also be affected.
Journal ArticleDOI
Azospirillum, a free-living nitrogen-fixing bacterium closely associated with grasses: genetic, biochemical and ecological aspects
Oda Steenhoudt,Jos Vanderleyden +1 more
TL;DR: Four aspects of the Azospirillum-plant root interaction are highlighted: natural habitat, plant root interaction, nitrogen fixation and biosynthesis of plant growth hormones, and the relevance of each of these four aspects for plant growth promotion by AzospIRillum is discussed.
Journal ArticleDOI
Identification of plant cytokinin biosynthetic enzymes as dimethylallyl diphosphate:ATP/ADP isopentenyltransferases.
TL;DR: Results indicate that cytokinin biosynthesis enzymes that catalyze the formation of the isopentenyl side chain of cytokinins are, at least in part, synthesized from ATP and ADP in plants.