Changes in the mitotic cycle in lateral root meristems of Vicia faba following kinetin treatment

Chromosoma ◽  
1968 ◽  
Vol 24 (2) ◽  
pp. 177-187 ◽  
Author(s):  
R. D. MacLeod
Keyword(s):  
Vicia Faba ◽  
Lateral Root ◽  
Mitotic Cycle ◽  
Root Meristems

CELL ARREST IN Gl AND G2 OF THE MITOTIC CYCLE OF VICIA FABA ROOT MERISTEMS

1973 ◽  
Vol 60 (9) ◽  
pp. 889-895 ◽  
Author(s):  
J. Van't Hof ◽  
D. P. Hoppin ◽  
S. Yagi
Keyword(s):  
Vicia Faba ◽  
Mitotic Cycle ◽  
Root Meristems ◽  
Cell Arrest

Effect of Mitomycin C on Lateral Root-Tip Chromosomes of Vicia faba

Science ◽  
1961 ◽  
Vol 133 (3449) ◽  
pp. 329-330
Author(s):  
Timothy Merz
Keyword(s):  
Mitomycin C ◽  
Vicia Faba ◽  
Lateral Root ◽  
Root Tip

Formation of lateral root meristems is a two-stage process

Development ◽  
1995 ◽  
Vol 121 (10) ◽  
pp. 3303-3310 ◽  
Author(s):  
M.J. Laskowski ◽  
M.E. Williams ◽  
H.C. Nusbaum ◽  
I.M. Sussex
Keyword(s):  
Lateral Root ◽  
Lateral Roots ◽  
Initial Period ◽  
Subsequent Stage ◽  
Root Initiation ◽  
Root Meristems ◽  
Lateral Root Initiation ◽  
Cell Layers ◽  
Stage Process ◽  
Pericycle Cells

In both radish and Arabidopsis, lateral root initiation involves a series of rapid divisions in pericycle cells located on the xylem radius of the root. In Arabidopsis, the number of pericycle cells that divide to form a primordium was estimated to be about 11. To determine the stage at which primordia are able to function as root meristems, primordia of different stages were excised and cultured without added hormones. Under these conditions, primordia that consist of 2 cell layers fail to develop while primordia that consist of at least 3–5 cell layers develop as lateral roots. We hypothesize that meristem formation is a two-step process involving an initial period during which a population of rapidly dividing, approximately isodiametric cells that constitutes the primordium is formed, and a subsequent stage during which meristem organization takes place within the primordium.

The Activity of a Tobacco Basic Chitinase Promotor in Transgenic White Clover Provides Insights into Plant Development and Symbiosis

1997 ◽  
Vol 24 (5) ◽  
pp. 555 ◽  
Author(s):  
Christopher Pittock ◽  
Jeremy J. Weinman ◽  
Barry G. Rolfe
Keyword(s):  
White Clover ◽  
Lateral Root ◽  
Transgene Expression ◽  
Lateral Roots ◽  
Developmental Expression ◽  
Nodule Formation ◽  
Post Inoculation ◽  
Environmental Response ◽  
Root Epidermis ◽  
Root Meristems

White clover was transformed with a tobacco basic chitinase promoter:GUS fusion. Basic chitinase promoter activity was detected by histochemical staining. Comparison of the spatial and temporal expression of the chitinase promoter-driven GUS gene in tobacco to that in white clover indicates that transcription from the promoter is induced by similar developmental and environmental response programs in each species. Wound-responsiveness of the white clover transgene was rapid and localised following mechanical and aphid (Family Aphididae) wounding. Developmental expression of the transgene during root morphogenesis reveals strong expression in tap and lateral root meristems but expression in lateral root meristems was observed only after the emergence through the tap root epidermis. No expression of the transgene was detected in the pericycle or the dividing cells of the developing lateral root. The expression of the tobacco basic chitinase promoter:GUS transgene in white clover was then used as a marker to examine the differences between the early developmental pathways leading to lateral root formation and those involoved in nodule formation in response to Rhizobium inoculation. Inoculation of the zone of emerging root hairs with a nodulation-competent Rhizobium strain ANU845(pRI4003), triggered transient transgene expression 2 to 4 h post-inoculation. No transgene expression was detectable after inoculation with purified Nod factor from strain ANU843. Our results suggest that lateral roots and nodules differ both in some of the mechanisms required to initiate cell division, and in their ongoing development after the emergence from the root epidermis.

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