scholarly journals Cytogenetic Effects of Gamma Rays on Indica Rice Radha-4

2006 ◽  
Vol 27 ◽  
pp. 25-36 ◽  
Author(s):  
S Basi ◽  
LP Subedi ◽  
GB KC ◽  
NR Adhikari
Keyword(s):  
Gamma Rays ◽  
Indica Rice ◽  
Animal Science ◽  
Multinucleated Cells ◽  
Cytogenetic Effects ◽  
Cytogenetic Aberrations ◽  
Different Types ◽  
Chromatin Bridges ◽  
Different Doses ◽  
Multivalent Association

The present study was conducted to understand the effects of different doses of radiations by gamma rays of Co60 on cytogenetics of indica rice, Radha-4 at the Central Lab, Institute of Agriculture and Animal Science, Rampur, Nepal. The immature PMC of M1 generation plants were analyzed performing the usual smearing and squashing technique. Radiation had a significant effect causing different types of cytogenetic aberrations, such as univalent and multivalent association of chromosomes, chromatin-bridges, laggards, fragments, stickiness, and multinucleated cells. An increasing number of aberrant cells with increasing dose of radiation was identified. The greatest share of aberration was identified due to multivalent association as a result of translocation followed by bridges and laggards, and the least effect for the stickiness of the chromosomes. Finally, 35 KR doses of gamma rays was the most potent dose inducing cytogenetic aberrations in meiotic pollen mother cell of rice compared to other dose spectrum.J. Inst. Agric. Anim. Sci. 27:25-36 (2006)

scholarly journals Studies on the effects of mutagens on cytotoxicity behaviour in Pigeon pea (Cajanus cajan (L.) Millsp) Var.CO-7.

2016 ◽  
Vol 1 (1) ◽  
pp. 25
Author(s):  
M. Ariraman ◽  
T. Bharathi ◽  
D. Dhanavel
Keyword(s):  
Gamma Rays ◽  
Cajanus Cajan ◽  
Pigeon Pea ◽  
Ethyl Methane Sulphonate ◽  
Relative Deviation ◽  
Methane Sulphonate ◽  
Deviation Rate ◽  
Different Types ◽  
Rate Frequency ◽  
Different Doses

The cytological studies provide more information regarding the response of a genotype to the particular mutagen and also provide chances to select desirable characters. The seeds of pigeon pea were subjected to different doses and concentrations of gamma rays and ethyl methane sulphonate (EMS). The effects of different mutagenic treatments on mitosis chromosomal behavior have been studied in both the mutagens. Different types of mitotic aberrations like stickiness, precocious movement, bridge, clumping of chromosome and laggards, etc., were observed in all the treatments. However, the gamma rays treatments proved to be more effective in inducing mitotic aberrations as compared to EMS. The frequency of laggard was high when compared to other mitotic aberrations. The reduction in mitotic index and relative deviation rate frequency were observed with increase in doses and conc. of both the mutagenic treatments and gamma rays were found to be more effective than EMS treatments.

EMS, sodium azide and gamma rays induced meiotic anomalies in Delphinium malabaricum (Huth) Munz

2013 ◽  
Vol 61 (1-4) ◽  
pp. 64-72 ◽  
Author(s):  
Firdose R. Kolar ◽  
Sandeep R. Pai ◽  
Ghansham B. Dixit
Keyword(s):  
Gamma Rays ◽  
Sodium Azide ◽  
Pollen Sterility ◽  
Chromosomal Anomalies ◽  
Multinucleated Cells ◽  
Meiotic Configuration ◽  
Mother Cells ◽  
Higher Doses ◽  
Chromatin Bridges ◽  
Meiotic Anomalies

Meiotic cell division is a dynamic cellular process controlled by a large number of genes that act from premeiotic to postmeiotic mitosis. Mutation in these genes may cause anomalies that impair plant fertility. In this study, an attempt has therefore been made to understand the effects of ethyl methane sulfonate (EMS), sodium azide (SA) and gamma rays on the meiotic configuration of Delphinium malabaricum. The results demonstrated that the mutagens cause various types of cytological aberrations, such as univalents, chromatin bridges, laggards, fragments, stickiness and multinucleated cells. The maximum aberrations were found at higher doses/concentrations of the mutagens. The highest percentage of pollen mother cells showing abnormalities was induced by EMS followed by gamma rays and SA. The mutagen impact on chromosomal anomalies increased the frequency of pollen sterility.

Cleft palate induction in hamster fetuses by glucocorticoid hormones and their synthetic analogues

Development ◽  
1976 ◽  
Vol 36 (1) ◽  
pp. 101-108
Author(s):  
Ravindra M. Shah ◽  
Alan Kilistoff
Keyword(s):  
Cleft Palate ◽  
Growth Inhibition ◽  
Fetal Growth ◽  
Glucocorticoid Hormones ◽  
Synthetic Analogues ◽  
Total Frequency ◽  
Different Types ◽  
Palatal Development ◽  
Different Doses

The effect of prenatal administration of different doses of cortisone, corticosterone, dexamethasone, triamcinolone and prednisolone on the fetus and its palatal development was studied. All the glucocorticoids, except cortisone, produced cleft palate in the fetuses. Both the total frequency and morphologically different types of cleft palate were related to the dose of the teratogen. Triamcinolone appeared to be more potent than other glucocorticoid in inducing cleft palate. An association was noted between fetal growth inhibition, the dose of the teratogen and the frequency and type of cleft palate.

Rubber Modified Asphalt Storage Stabilizer Option

2011 ◽  
Vol 311-313 ◽  
pp. 1136-1139
Author(s):  
Zhong He Chen ◽  
Zheng Qian Zhang ◽  
Hua Lin Luo ◽  
Ning Ning Dong
Keyword(s):  
Storage Stability ◽  
Experimental Methods ◽  
Modified Asphalt ◽  
The Poor ◽  
Different Types ◽  
And Storage ◽  
Different Doses

In order to improve the poor compatibility and storage stability of rubber modified asphalt,authors using theoretical and experimental methods, to investigate the influence of the stabilizer on the storage stability and the using performance of rubber modified asphalt, through adding the different types and different doses of stabilizer, to improve its storage stability and using performance of modified asphalt.

Toxicity and immunogenicity of Crotalus durissus terrificus venom treated with different doses of gamma rays

Toxicon ◽  
1999 ◽  
Vol 37 (8) ◽  
pp. 1131-1141 ◽  
Author(s):  
Patricia Bianca Clissa ◽  
Nanci do Nascimento ◽  
José Roberto Rogero
Keyword(s):  
Gamma Rays ◽  
Crotalus Durissus Terrificus ◽  
Crotalus Durissus ◽  
Different Doses

scholarly journals Genetic Variability Studies in M5 Generations of Determinate Early Maturing Cluster Bean [Cyamopsis tetragonoloba (L.) Taub] (MDU-1) Mutants for Yield and Yield Attributing Characters

2022 ◽  
Author(s):  
Devi Suresh ◽  
M. Ananthan ◽  
C. Vanniarajan ◽  
P. Balasubramanian ◽  
T. Sivakumar ◽  
...  
Keyword(s):  
Gamma Rays ◽  
High Yield ◽  
Cyamopsis Tetragonoloba ◽  
Variability Analysis ◽  
Cluster Bean ◽  
Bean Variety ◽  
Early Maturing ◽  
Per Se ◽  
Mutant Lines ◽  
Different Doses

Background: MDU-1 is a high yielding, indeterminate cluster bean variety. In order to develop determinate mutant with high yield, MDU-1 cluster bean variety was irradiated using gamma rays, electron beam and combination of gamma rays and EMS with different doses and the variability induced in M5 generations were studied. Methods: Twenty one best individual plants from M4 generation were selected based on plant height and higher yield and forwarded to M5 generation where they were evaluated in RBD with three replications. Fourteen non-segregating mutant lines with desirable traits were identified in M5 generation and were evaluated for variability along with the parent MDU1. Result: Five best mutant lines namely ACMC-020-04, ACMC-020-11, ACMC-020-08, ACMC-020-10 and ACMC-020-11 were selected from the 14 accessions based on per se performance and variability analysis. The selected mutants needs to be forwarded for stability testing in different environments.

scholarly journals IV. Effect of 60Co gamma rays on survival rate of China aster plants (Callistephus chinensis Nees) in M1 generations - under field conditions

2013 ◽  
Vol 35 (2) ◽  
pp. 277-283
Author(s):  
A. Wosińska
Keyword(s):  
Survival Rate ◽  
Gamma Radiation ◽  
Gamma Rays ◽  
Lethal Effect ◽  
Field Conditions ◽  
Considerable Decrease ◽  
Planting Time ◽  
Variety Effect ◽  
China Aster ◽  
Different Doses

Studies were undertaken on the effect of different doses of gamma radiation on survival rate of plants (germinated from irradiated seeds) for 5 China aster varieties specified at florescence time. During their growth under field conditions (from planting time to blooming) lethal effect of the radiation occurred in plants of all varieties and its level depended on dose and variety. Effect of 3 kR and 6 kR doses differed depending on variety and was not always harmful, but following irradiation with doses exceeding 6 kR a considerable decrease in survival rate was observed. Radioresistance of studied varieties - measured both: by LD<sub>50</sub> and LD<sub>l00</sub> - differed; depending on variety, LD<sub>50 </sub>and LD<sub>l00</sub> values fluctuated: from 6 to 9 kR and 12 to 15 kR respectively.

The teratogenic effects of hydrocortisone on palatal development in the hamster

Development ◽  
1976 ◽  
Vol 35 (1) ◽  
pp. 213-224
Author(s):  
Ravindra M. Shah ◽  
Anthony A. Travill
Keyword(s):  
Cleft Palate ◽  
Close Association ◽  
Fetal Growth Retardation ◽  
Placental Barrier ◽  
Teratogenic Effects ◽  
Different Types ◽  
Palatal Development ◽  
Two Peaks ◽  
Different Doses ◽  
Hydrocortisone Treatment

The effect of different doses of hydrocortisone, administered at various times during gestation, on the fetal hamster and its palatal development was studied. Both the frequency of cleft palate and that of resorption depended upon the dose of hydrocortisone and the time of its administration. Two peaks in the incidence of cleft palate were observed, which appeared to be due to inhibition of different events. Incidence of morphologically different types of cleft palate was related to the doses and gestational time of hydrocortisone treatment. A close association was observed between the frequency of cleft palate and fetal growth retardation and between the latter and the dose and time of drug administration. It was suggested that maternal physiology and the placental barrier may play a crucial role in cleft palate induction.

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