scholarly journals Time Course of Exudation from Excised Corn Root Segments of Different Stages of Development

1970 ◽  
Vol 45 (5) ◽  
pp. 571-575 ◽  
Author(s):  
Richard C. Smith
Keyword(s):  
Time Course ◽  
Stages Of Development ◽  
Corn Root ◽  
Root Segments

scholarly journals Polar Transport Characteristics of Radiostrontium and Radiocalcium in Isolated Corn Root Segments

1967 ◽  
Vol 42 (5) ◽  
pp. 747-750 ◽  
Author(s):  
Burton E. Vaughan ◽  
Evan C. Evans ◽  
Maxine E. Hutchin
Keyword(s):  
Polar Transport ◽  
Corn Root ◽  
Root Segments

Rapid-growth responses of corn root segments: Effect of auxin on elongation

Planta ◽  
1977 ◽  
Vol 135 (1) ◽  
pp. 1-5 ◽  
Author(s):  
Kathryn L. Edwards ◽  
T. K. Scott
Keyword(s):  
Rapid Growth ◽  
Growth Responses ◽  
Corn Root ◽  
Root Segments

Rapid growth responses of corn root segments: Effect of pH on elongation

Planta ◽  
1974 ◽  
Vol 119 (1) ◽  
pp. 27-37 ◽  
Author(s):  
Kathryn L. Edwards ◽  
Tom K. Scott
Keyword(s):  
Rapid Growth ◽  
Growth Responses ◽  
Effect Of Ph ◽  
Corn Root ◽  
Root Segments

Patterns of assimilate distribution in soybeans at maturity. II.* The time course of changes in 14C distribution in pods and stem sections

1977 ◽  
Vol 28 (3) ◽  
pp. 395 ◽  
Author(s):  
RA Stephenson ◽  
GL Wilson
Keyword(s):  
Time Course ◽  
Stages Of Development ◽  
Pod Development

Leaves at two levels in the canopy of determinate soybeans were allowed to assimilate 14CO2 at one of several stages of development from late pre-flowering until pod maturity, and the distribution of 14CO activity in above-ground parts of the plants was followed up to maturity. Between pre-flowering and early pod development, assimilate was stored in stems and transferred to pods during later development; at later stages, current assimilate went directly from leaves to pods. Carbon fixed subsequent to flowering went to pods in the axils of treated leaves, and to pods at the second nodes above and below fed leaves but not to adjacent nodes. The source of substrate for filling pods in the apical raceme was not apparent from this study. __________________ *Part I, Aust. J. Aguic. Res., 28: 203 (1977).

scholarly journals Electrical Resistances of Corn Root Segments

1976 ◽  
Vol 57 (2) ◽  
pp. 137-141 ◽  
Author(s):  
W. P. Anderson ◽  
Noe Higinbotham
Keyword(s):  
Corn Root ◽  
Root Segments

scholarly journals Transcriptional control of gene expression during development of Dictyostelium discoideum.

1982 ◽  
Vol 2 (11) ◽  
pp. 1417-1426 ◽  
Author(s):  
S M Landfear ◽  
P Lefebvre ◽  
S Chung ◽  
H F Lodish
Keyword(s):  
Dictyostelium Discoideum ◽  
Transcriptional Control ◽  
Time Course ◽  
In Vitro Transcription ◽  
Cell Contact ◽  
Cellular Slime Mold ◽  
Stages Of Development ◽  
Control Of Gene Expression ◽  
The Stability

During development of the cellular slime mold Dictyostelium discoideum, approximately 2,000 to 3,000 regulated mRNAs are induced when amoebae enter multicellular aggregates. We used in vitro transcription in isolated nuclei to follow the synthesis of individual mRNA precursors during development; these were quantitated by hybridization to cloned cDNAs or genomic DNAs. Those RNAs that are present at all stages of development--the common RNAs--were transcribed by nuclei from cells at all stages of development. By contrast, those RNAs that are present only after cells begin to aggregate--here called aggregation stage RNAs--were transcribed only by nuclei from cells at the aggregation and postaggregation stages of development. The temporal pattern of in vitro transcription correlated well with the time course of accumulation of different aggregation stage mRNAs. Continued expression of aggregation stage genes normally depends upon cell-to-cell contact or cyclic AMP (cAMP); when cells are disaggregated, the regulated mRNAs are rapidly and specifically degraded. When cAMP is subsequently added to the disaggregated cells, most of the mRNAs reaccumulate. We show here that disaggregation reduced 2- to 10-fold the relative transcription of several aggregation stage RNAs, whereas addition of cAMP to disaggregated cells reinduced the level of regulated gene transcription to values approximating those found in normal postaggregation cells. These results indicate that a representative set of Dictyostelium aggregation stage genes are under transcriptional control; both the transcription and the stability of these mRNAs require either continued cell-to-cell interactions or cAMP.

Relationship between the Stages of Development of Fusarium moniliforme ATCC 38932 and Production of Fusarin C

1997 ◽  
Vol 60 (4) ◽  
pp. 433-435
Author(s):  
MARIA J. CANTALEJO ◽  
JOSE M. CARRASCO ◽  
E. HERNÁNDEZ
Keyword(s):  
Fusarium Moniliforme ◽  
Time Course ◽  
Culture Medium ◽  
Developmental Stages ◽  
Sharp Decrease ◽  
Stages Of Development ◽  
Maximum Production ◽  
Time Course Study ◽  
Kinetics Of

A study of the kinetics of fusarin C production by Fusarium moniliforme ATCC 38932, a known producer of fusarin C, was carried out. This strain was subcultured on an EG medium for an adequate sporulation, and a 4% inoculum was transferred to the 10% ICI N medium. The conditions for the production of fusarin C in this synthetic culture medium were optimized. The time-course study of fusarin C performed over 26 days with this strain showed three different developmental stages in which a maximum production of fusarin C was reached on the 8th day of incubation; thereafter this strain ceased growing exponentially and exhibited a sharp decrease of fusarin C from that moment on.

Transcriptional control of gene expression during development of Dictyostelium discoideum

1982 ◽  
Vol 2 (11) ◽  
pp. 1417-1426
Author(s):  
S M Landfear ◽  
P Lefebvre ◽  
S Chung ◽  
H F Lodish
Keyword(s):  
Dictyostelium Discoideum ◽  
Transcriptional Control ◽  
Time Course ◽  
In Vitro Transcription ◽  
Cell Contact ◽  
Cellular Slime Mold ◽  
Stages Of Development ◽  
Control Of Gene Expression ◽  
The Stability

During development of the cellular slime mold Dictyostelium discoideum, approximately 2,000 to 3,000 regulated mRNAs are induced when amoebae enter multicellular aggregates. We used in vitro transcription in isolated nuclei to follow the synthesis of individual mRNA precursors during development; these were quantitated by hybridization to cloned cDNAs or genomic DNAs. Those RNAs that are present at all stages of development--the common RNAs--were transcribed by nuclei from cells at all stages of development. By contrast, those RNAs that are present only after cells begin to aggregate--here called aggregation stage RNAs--were transcribed only by nuclei from cells at the aggregation and postaggregation stages of development. The temporal pattern of in vitro transcription correlated well with the time course of accumulation of different aggregation stage mRNAs. Continued expression of aggregation stage genes normally depends upon cell-to-cell contact or cyclic AMP (cAMP); when cells are disaggregated, the regulated mRNAs are rapidly and specifically degraded. When cAMP is subsequently added to the disaggregated cells, most of the mRNAs reaccumulate. We show here that disaggregation reduced 2- to 10-fold the relative transcription of several aggregation stage RNAs, whereas addition of cAMP to disaggregated cells reinduced the level of regulated gene transcription to values approximating those found in normal postaggregation cells. These results indicate that a representative set of Dictyostelium aggregation stage genes are under transcriptional control; both the transcription and the stability of these mRNAs require either continued cell-to-cell interactions or cAMP.

Sign in / Sign up

Export Citation Format

Share Document