نتایج جستجو برای: auxins
تعداد نتایج: 4548 فیلتر نتایج به سال:
Auxins have been the first plant growth regulators discovered several decades ago. They play a complex and important role in the dendritic network of the physiological processes in plants. Nevertheless, a correlation between their chemical structure and its biological implication could not be found. Many theories on correlations of structure and activity have been developed, which are based mai...
There are adequate grounds for believing in the existence of nuclear or cytoplasmic receptors mediating transcriptional or translational effects of plant hormones, and several putative receptor proteins have received limited experimental study [see Venis (1973) for review and also Fox & Erion (1975)l. At the same time many physiological responses to plant hormones, especially to auxins, take pl...
(Histological changes in banana explants, cv. Nanicão (Musa spp. Group AAA), submitted to different auxins for induction of somatic embryogenesis). The present work analyzes the behavior of banana explants, cv. Nanicão (Musa spp. Group AAA) regarding somatic embryogenesis induction treatments with several auxins. Longitudinal segments of shoot meristematic apices of micropropagated banana pla...
Root formation in plants involves the continuous interpretation of positional cues. Physiological studies have linked root formation to auxins. An auxin response element displays a maximum in the Arabidopsis root and we investigate its developmental significance. Auxin response mutants reduce the maximum or its perception, and interfere with distal root patterning. Polar auxin transport mutants...
Callus cultures of Vaccinium corymbosum var. bluecrop were optimized for their isoprene derivatives production by supplementing Schenk-Hildebrandt (SH) medium with constant concentration of kinetin (2.32 microM) and two different amounts of selected auxins. Every auxin, except for IBA, used in 10-time higher concentration (2,4D, NAA, IAA, NOA) stimulated biosynthesis of beta-sitosterol and inhi...
Cereus peruvianus (Cactaceae) is an important medical plant. The study was carried out on callus induction of Cereus jamacaru f. monstrosus and Cereus hildmannianus fma monstrosa (Cereus peruvianus). Apical and lateral explants were cultured on Murashige and Skoog media with factorial combinations of the auxins indole-3acetic acid (NAA), 2, 4-dichlorophenoxyacetic acid (2,4-D) and N-(2-furanyl-...
The arc,4 , a member of the G protei" ll-sllbunit fHmi]y, was isolated from tobacco BY-2 cells as an auxin-responsive gene. Characterization of arc.4, which should help to elucidate the function of the gene product in the plant cells, was performed with emphasis on the mode of expression and the analysis of its promoter. Accumulation of the arct4 message was detected only after treatments with ...
We developed procedures for the micropropagation of Juniperus oxycedrus L. using shoot apices or nodal segments from mature plants. Of the media and explants examined, best culture establishment was obtained with shoot apices cultured on modified Schenk and Hildebrandt medium (SH medium) without growth regulators; however, shoot multiplication was only achieved when shoot apices isolated from s...
Auxins upregulate expression of the indole-3-pyruvate decarboxylase gene in Azospirillum brasilense.
Transcription of the Azospirillum brasilense ipdC gene, encoding an indole-3-pyruvate decarboxylase involved in the biosynthesis of indole-3-acetic acid (IAA), is induced by IAA as determined by ipdC-gusA expression studies and Northern analysis. Besides IAA, exogenously added synthetic auxins such as 1-naphthaleneacetic acid, 2,4-dichlorophenoxypropionic acid, and p-chlorophenoxyacetic acid we...
Intercellular flow of the phytohormone auxin underpins multiple developmental processes in plants. Plant-specific pin-formed (PIN) proteins and several phosphoglycoprotein (PGP) transporters are crucial factors in auxin transport-related development, yet the molecular function of PINs remains unknown. Here, we show that PINs mediate auxin efflux from mammalian and yeast cells without needing ad...
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