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Root meristem
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The word for cytokinin is a generic name and naturally occurring substances that are known to promote cell division. The term cytokinin was proposed by Letham in 1963. It is also known to delay senescence. In corn the first naturally occurring cytokinin was found and is named as zeatin. The most widely distributed cytokinins are the synthetic benzyladenine and kinetin. The natural cytokinin found in apical root meristem, inflorescences and developing fruits.
8p
caygaocaolon11
21-04-2021
12
3
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Boron is concerned with the precipitation of excess cation, buffer action, maintenance of conducting tissues and help in absorption of nitrogen. Its primary role is concerned with metabolism both with its uptake and efficient use in plants. Boron also affect the cambial and phloem tissues of storage root or stem apical meristems and leaves, vascular cambia of fruits and other organs which are capable of meristematic activities (Singh, 1991).
6p
chauchaungayxua10
19-03-2021
13
2
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Exocytosis is integral to root growth: trafficking components of systems that control growth (e.g., PIN auxin transport proteins) to the plasma membrane, and secreting materials that expand the cell wall to the apoplast.
20p
viminato2711
22-05-2020
13
2
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Adventitious rooting is an organogenic process by which roots are induced from differentiated cells other than those specified to develop roots. In forest tree species, age and maturation are barriers to adventitious root formation by stem cuttings.
19p
viminato2711
22-05-2020
12
1
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We reported previously that root elongation in Arabidopsis is promoted by exogenous proline, raising the possibility that this amino acid may modulate root growth.
14p
vihashirama2711
21-05-2020
17
2
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GRAS transcription factors usually act as integrators of multiple growth regulatory and environmental signals, including axillary shoot meristem formation, root radial pattering, phytohormones, light signaling, and abiotic/biotic stress.
18p
vihashirama2711
21-05-2020
20
0
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Trichoderma fungi live in the soil rhizosphere and are beneficial for plant growth and pathogen resistance. Several species and strains are currently used worldwide in co-cultivation with crops as a biocontrol alternative to chemical pesticides even though little is known about the exact mechanisms of the beneficial interaction.
11p
vichoji2711
29-04-2020
15
1
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Most ABC transporters are engaged in transport of various compounds, but its subfamily F lacks transmembrane domain essential for chemical transportation. Thus the function of subfamily F remains further elusive.
10p
vishikamaru2711
29-04-2020
14
0
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In this investigation two different methods using aqueous solutions of colchicine were used to treat F1 tillers from various Triticum durum x Aegilops tauschii crosses in order to artificially induce chromosome doubling. Treatment of crown root region (uproot) was found effective compared to in-situ (tip) method using treatment of apical meristems of F1 tillers at 2-3 tiller stage. The aqueous solution of colchicine was administered at two concentrations viz., 0.05 and 0.075% in both the methods. The 0.05% colchicine solution was found more effective as more doubled seed was obtained.
5p
cothumenhmong1
08-12-2019
8
1
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A protocol for direct plantlet regeneration from aerial stem explants of ginger (Zingiber officinale Rosc.) has been developed. Adventitious shoots and roots were regenerated from in planta aerial stem explants of 2 ginger varieties viz. var. ‘Jamaica’ and var. ‘Varada’. Maximum shoot and root regeneration were observed in the cultures containing TDZ and IBA (1:1; 1:0.1 mg L-1) in both varieties.
9p
vibasque27
27-03-2019
16
1
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The present study evaluated the genotoxic effect of aqueous extract of C. sarcomedium Meve & Liede and its protective role in chromosomal aberrations induced by 2% hydrogen peroxide (H2O2) on Allium cepa root meristem. Our results showed that the C. sarcomedium extract induced major chromosomal aberrations, viz., nuclear lesions, chromosome breaks, chromosome laggards, vagrance, stickiness, and bridges.
10p
vikimsa
22-02-2019
15
0
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In the present study the clastogenic activity of curcumin (the active component of turmeric) and aloin (the active component of aloe) was evaluated at doses of 5, 10, 20, 30, 50, and 100 μg/mL for 4, 8, and 12 h. Both curcumin and aloin had significant dose- and time-dependent clastogenic effects on the test plant system (Allium cepa L.).
8p
vivant2711
01-02-2019
15
1
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Nanogenotoxicity is an emergent field, relevant for estimating the potential genotoxic risk of nanomaterials. In this study we investigated the genotoxic potential of zinc oxide (ZnO, ≤35 and 50 nm) and titanium dioxide nanoparticles (NPs) in the nuclei of Allium cepa root meristem cells by using a modified alkaline comet assay.
9p
sony2711
01-02-2019
22
1
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The present study investigates the cytotoxic and genotoxic effects of two frequently employed synthetic food colorants, lemon yellow and orange red, using an Allium cepa assay. Uptake of food colorants by root cells at different concentrations and varied exposures significantly altered the cytogenetic system, membrane integrity, mitochondrial function, root growth, and cell division.
12p
sony2711
28-01-2019
13
2
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A protocol for production of virus-free Vitis vinifera using meristem culture was developed. Meristems (0.1-0.2 mm) of V. vinifera infected with grapevine fanleaf virus and grape leafroll associated viruses were excised from 1-yearold growing vines.
12p
masterbarista
15-01-2019
30
2
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Chapter 35 - Plant structure, growth, and development. This chapter compare structures or cells; explain the phenomenon of apical dominance; distinguish between determinate and indeterminate growth; describe in detail the primary and secondary growth of the tissues of roots and shoots; describe the composition of wood and bark; distinguish between morphogenesis, differentiation, and growth; explain how a vegetative shoot tip changes into a floral meristem.
76p
tangtuy02
08-03-2016
29
3
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The apical meristem and zone of cell extension of impeded roots is shorter (Barley, 1962; Souty, 1987), and root hairs develop closer to the tip of impeded roots (Goss & Russell, 1980). Lateral initiation occurs nearer the tip and laterals occur together along the impeded axis (Goss & Russell, 1980; Barley, 1962). Where mechanical deflection causes roots to curve around an obstacle, the initiation of laterals generally occurs on the convex side of the root (Goss & Russell, 1980). Root hair development is greater on the opposite (concave) side and, in...
61p
loixinloi
08-05-2013
43
3
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When a root tip encounters an obstacle that resists penetration, the root cap becomes less pointed and the surface cells may slough off (Souty, 1987). Mechanical impedance decreases the rate of root elongation because of both a decrease in the rate of cell division in the meristem, and a decrease in cell length (rather than volume). Eavis (1967) found a decrease of 40% in the cell division rate at a root penetration resistance (0.34 MPa) sufficient to decrease the root elongation rate by 70%. Cell length is decreased and the volume of the inner cortical cells may...
47p
loixinloi
08-05-2013
47
2
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Tuyển tập các báo cáo nghiên cứu về y học được đăng trên tạp chí y học Minireview cung cấp cho các bạn kiến thức về ngành y đề tài: Cytokinin and auxin intersection in root meristems...
0p
thulanh21
12-11-2011
50
4
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