Interaction of gibberellins and phytochrome in the control of cowpea epicotyl elongation

1992 ◽  
Vol 86 (2) ◽  
pp. 236-244 ◽  
Author(s):  
Jaime F Martínez-García ◽  
José L. García-Martínez
Keyword(s):  
Epicotyl Elongation

Evaluation of phytotoxicity of effluents from activated sludge and constructed wetland system for wastewater reuse

2019 ◽  
Vol 79 (4) ◽  
pp. 656-667 ◽  
Author(s):  
Ana María Leiva ◽  
Adrián Albarrán ◽  
Daniela López ◽  
Gladys Vidal
Keyword(s):  
Activated Sludge ◽  
Wastewater Reuse ◽  
Treated Wastewater ◽  
Positive Effects ◽  
Treated Wastewater Reuse ◽  
Epicotyl Elongation ◽  
Petri Dishes ◽  
The Impact ◽  
Positive Effect ◽  
Seeds Germination

Abstract The aim of this study was to evaluate the phytotoxicity of wastewater treated with horizontal subsurface flow (HSSF) constructed wetlands (CWs) and activated sludge (AS) system using disinfection treatment such chlorination and ultraviolet (UV) system. To assess the impact of the reuse of different effluents (HSSF-Cl, HSSF-UV, AS-Cl and AS-UV), bioassays using seeds of Raphanus sativus (R. sativus) and Triticum aestivum (T. aestivum), were performed on both Petri dishes and soil. Different treated wastewater concentrations were varied (6.25%, 12.5%, 25%, 50% and 100%) and the percentage of germination inhibition (PGI), percentage of epicotyl elongation (PEE) and germination index (GI) were determined. Positive effects (PGI and PEE <0% and GI >80%) of HSSF-Cl, HSSF-UV, AS-Cl and AS-UV effluents on germination and epicotyl elongation of R. sativus and T. aestivum were observed in Petri dishes bioassays. However, toxic effects of HSSF-Cl, HSSF-UV and AS-Cl on seeds germination and epicotyl elongation of both plant species were detected in soil samples (PGI and PEE >0% and GI <80%). Only R. sativus seeds to be irrigated with AS-UV achieved GI values above 86% for all concentrations evaluated. These results indicated that AS-UV effluent had a positive effect on seeds germination and can be recommended for treated wastewater reuse in agricultural irrigation.

Germination of cut seeds and seedling growth of ash (Fraxinus spp.) in vitro

1995 ◽  
Vol 25 (8) ◽  
pp. 1368-1374 ◽  
Author(s):  
John E. Preece ◽  
Sharon A. Bates ◽  
J.W. Van Sambeek
Keyword(s):  
Plant Growth ◽  
Growth Regulators ◽  
Seedling Development ◽  
Green Ash ◽  
White Ash ◽  
Murashige And Skoog Medium ◽  
Epicotyl Elongation ◽  
Viable Seeds ◽  
Mature Seeds

Nonstratified seeds of different genotypes of Fraxinusamericana L. (white ash), Fraxinuspennsylvanica Marsh, (green ash), and Fraxinusangustifolia Vahl. ssp. oxycarpa (narrowleaf ash, of Afghanistan origin) were surface disinfested, cut, and germinated in vitro on agar-solidified MS (Murashige and Skoog) medium containing sucrose and various plant growth regulators. Before placing in vitro, approximately one-third of the seed opposite the radicular end was excised and discarded, or the apical and basal 1 mm tips of the seed were aseptically excised. Within 1 week, viable seeds germinated. Cotyledons emerged, elongated, expanded, and turned green. After 2 weeks hypocotyls and radicles elongated. White and green ash genotypes germinated at different rates; generally >80% of seeds placed in vitro germinated. Genotype and the presence of thidiazuron in the medium had an effect on seedling development (hypocotyl and epicotyl elongation). Immature as well as nonstratified mature seeds germinated and grew. Epicotyls were excised, rooted, and established in the greenhouse.

scholarly journals Regulation of Pea Epicotyl Elongation by Blue Light

1989 ◽  
Vol 89 (1) ◽  
pp. 293-298 ◽  
Author(s):  
Marta J. Laskowski ◽  
Winslow R. Briggs
Keyword(s):  
Blue Light ◽  
Epicotyl Elongation ◽  
Pea Epicotyl

scholarly journals A proteomics study of the mung bean epicotyl regulated by brassinosteroids under conditions of chilling stress

2006 ◽  
Vol 11 (2) ◽  
Author(s):  
Bin Huang ◽  
Chien-Hua Chu ◽  
Shu-Ling Chen ◽  
Hsueh-Fen Juan ◽  
Yih-Ming Chen
Keyword(s):  
Cell Wall ◽  
Mung Bean ◽  
Chilling Stress ◽  
Atp Synthesis ◽  
Methionine Synthase ◽  
Regulatory Relationship ◽  
Proteomics Study ◽  
Epicotyl Elongation ◽  
Wall Construction ◽  
Exogenous Treatment

AbstractMung bean CYP90A2 is a putative brassinosteroid (BR) synthetic gene that shares 77% identity with the Arabidopsis CPD gene. It was strongly suppressed by chilling stress. This implies that exogenous treatment with BR could allow the plant to recover from the inhibited growth caused by chilling. In this study, we used proteomics to investigate whether the mung bean epicotyl can be regulated by brassinosteroids under conditions of chilling stress. Mung bean epicotyls whose growth was initially suppressed by chilling partly recovered their ability to elongate after treatment with 24-epibrassinolde; 17 proteins down-regulated by this chilling were re-up-regulated. These up-regulated proteins are involved in methionine assimilation, ATP synthesis, cell wall construction and the stress response. This is consistent with the re-up-regulation of methionine synthase and S-adenosyl-L-methionine synthetase, since chilling-inhibited mung bean epicotyl elongation could be partially recovered by exogenous treatment with DL-methionine. This is the first proteome established for the mung bean species. The regulatory relationship between brassinosteroids and chilling conditions was investigated, and possible mechanisms are discussed herein.

Gibberellin-induced ethylene production and its effect on cowpea epicotyl elongation

1984 ◽  
Vol 2 (3) ◽  
pp. 209-216 ◽  
Author(s):  
Jose L. Garcia-Martinez ◽  
Noah Ben-Shalom ◽  
Lawrence Rappaport
Keyword(s):  
Ethylene Production ◽  
Epicotyl Elongation

scholarly journals Effect of Acute Exposure of Gamma Rays on Seed Germination and Seedling Growth of Pinus kesiya Gord and P. wallichiana A.B. Jacks

Our Nature ◽  
1970 ◽  
Vol 2 (1) ◽  
pp. 13-17 ◽  
Author(s):  
C.B. Thapa
Keyword(s):  
Seed Germination ◽  
Radiation Exposure ◽  
Seedling Growth ◽  
Gamma Rays ◽  
Acute Exposure ◽  
Pinus Kesiya ◽  
Inhibition Of Growth ◽  
Epicotyl Elongation

Present study deals with the effect of acute exposure of gamma rays on Pinus kesiya and P. wallichiana. Seeds were eradicated with a 60cobalt sources emitting gamma rays at the rate of 2.8 kR/min. The seeds were given 1.0, 2.5, 5.0, 10.0, 15.0, 20.0 and 30.0 kR exposures. Germination in control and treated seeds of both the species started simultaneously 26 days after sowing. In P. kesiya seeds exposed to 30kR germinated but in P. wallichiana 30 kR was lethal for seed germination and it was restricted up to 20 kR only. With increasing exposure root, hypocotyl and epicotyl elongation decreased in both the species. In P. kesiya more than 50% inhibition was induced by 10 kR but in P. wallichiana this exposure induced 100% inhibition of growth in all the cases. In both the species the intensity of inhibition increased with increasing exposures though lower exposure in some cases was stimulatory.Keywords: Radiation exposure, gamma rays, 60cobalt, intensity, stimulation, inhibition.doi:10.3126/on.v2i1.318Our Nature (2004) 2: 13-17

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