A comparative study of initiation and development of embryogenic callus from haploid embryos of several barley cultivars. I. Developmental state of embryo explants and callus potential

1987 ◽  
Vol 65 (1) ◽  
pp. 53-56 ◽  
Author(s):  
L. S. Kott ◽  
E. Kott ◽  
M. Howarth ◽  
K. J. Kasha
Keyword(s):  
Comparative Study ◽  
Rapid Growth ◽  
Embryogenic Callus ◽  
Growth Period ◽  
Developmental State ◽  
Root Initiation ◽  
Barley Cultivars ◽  
Haploid Embryos ◽  
Haploid Callus ◽  
Secondary Shoot

Six cultivars of barley (‘Akka’, ‘Bruce’, ‘Klages’, ‘Leger’, ‘Perth’, and ‘York’) were compared for their ability to produce haploid embryos competent to produce embryogenic haploid callus. The capacity to generate such callus from scutellar epidermal cells is different among these cultivars and appears to be correlated with the developmental state–age of the embryo and associated with a rapid growth period. Histological examination of 12-, 14-, and 16-day-old embryos confirmed the meristematic nature of the callus-initiating cells and produced results which correspond well with results obtained from cultures of other similar embryos. Variability among cultivars in embryo development, root initiation from callus, and primary and secondary shoot regeneration was also identified.

A comparative study of initiation and development of embryogenic callus from haploid embryos of several barley cultivars. II. Cytophotometry of embryos and callus

1986 ◽  
Vol 64 (9) ◽  
pp. 2107-2112 ◽  
Author(s):  
L. S. Kott ◽  
S. Flack ◽  
K. J. Kasha
Keyword(s):  
Hordeum Vulgare ◽  
Comparative Study ◽  
Ploidy Level ◽  
Embryogenic Callus ◽  
Hordeum Vulgare L ◽  
Barley Cultivars ◽  
Haploid Embryos ◽  
Diploid Level

Cells of haploid barley embryos (Hordeum vulgare L. 'Bruce', 'Perth', and 'Klages') and callus cells originating from embryos were cytophotometrically examined to determine the ploidy level. Specific embryo tissues regularly exhibited predictable ploidies and smaller embryos had a higher percentage of haploid cells than larger embryos of the same age. The predominantly haploid cells of the scutellar epidermis of the embryo initiated callus which generally, at least initially, was haploid. Monitoring of the ploidy evolution of these haploid calli showed that over a 6-month period each line exhibited its own unique rate of polyploidization, although lines of the same cultivar showed similar trends. Accumulation of cells at the diploid level was often a characteristic of these cultures.

Francophonie and Zionism: A Comparative Study in Transnationalism and Trans-statism

1998 ◽  
Vol 7 (2) ◽  
pp. 119-148
Author(s):  
William F.S. Miles ◽  
Gabriel Sheffer
Keyword(s):  
Human Rights ◽  
Comparative Study ◽  
Multinational Corporations ◽  
Rapid Growth ◽  
International Level ◽  
Amnesty International ◽  
Transnational Organizations ◽  
Governmental Organizations ◽  
Non Governmental Organizations ◽  
The 1950S

For about four decades now, practitioners and scholars have been examining transnational organizations, the networks that they create, their varied activities, and the economic and political ramifications of these activities. Initially these observers mainly focused on the multinational corporations (MNCs) that gained considerable visibility and, one may say, disrepute in the 1950s and 1960s. Then, as these MNCs and inter-governmental organizations (IGOs) proliferated, investigators widened the scope of their examination to analyze such organizations’ growing variety (see, for example, Keohane and Nye; Said and Simmons; Jenkins). Later observers studied the emergence and rapid growth of non-governmental organizations (NGOs)—such as Greenpeace, Amnesty International, and various religious cults, including the admirers of the Maharishi, the Moonies, and Scientology—that have been active on the international level in such diverse spheres as ecology, human rights, and religion (Galtung; Mansbach, Ferguson, and Lampert; Modelski).

48. Visions of the Good City in the Rapid Growth Period - André Sorensen

2016 ◽  
pp. 207-209
Author(s):  
Kären Wigen ◽  
Sugimoto Fumiko ◽  
Cary Karacas
Keyword(s):  
Rapid Growth ◽  
Growth Period

Comparative Study of Activity and Heat Stability of Limit Dextrinase in 16 Barley Cultivars

2008 ◽  
Vol 85 (3) ◽  
pp. 271-275 ◽  
Author(s):  
Fen Li ◽  
Jun-e Zhang ◽  
Hong-Mei Liu ◽  
Shu-juan Tian ◽  
Xian-Guang Yang ◽  
...  
Keyword(s):  
Comparative Study ◽  
Heat Stability ◽  
Barley Cultivars ◽  
Limit Dextrinase

A comparative study of the total β-glucan contents of some Australian barleys

1985 ◽  
Vol 25 (2) ◽  
pp. 424 ◽  
Author(s):  
RJ Henry
Keyword(s):  
Comparative Study ◽  
Malt Extract ◽  
Grain Hardness ◽  
Varietal Differences ◽  
Barley Cultivars ◽  
Grain Nitrogen ◽  
Total P

The total P-glucan contents of 13 barley cultivars and 12 experimental barley lines were measured using an enzymic technique. The average P-glucan content of barley cultivars grown in 1981 and 1982 at two different sites ranged from 4.03% for Clipper to 5.26% for Malebo. The average values for the experimental lines varied from 4.12 to 5.12%. Total P-glucan was more closely related to grain hardness than to malt extract. For individual varieties P-glucan content increased with increasing grain nitrogen but the magnitude of varietal differences meant that there was no overall relationship between P-glucan and nitrogen.

Enhancement of plant regeneration from embryogenic callus of commercial barley cultivars

1998 ◽  
Vol 17 (12) ◽  
pp. 941-945 ◽  
Author(s):  
P. Bregitzer ◽  
L. S. Dahleen ◽  
R. D. Campbell
Keyword(s):  
Plant Regeneration ◽  
Embryogenic Callus ◽  
Barley Cultivars

scholarly journals Genotype, Temperature, and Sampling Date Affect Embryogenesis in Asparagus Anther Culture

HortScience ◽  
1993 ◽  
Vol 28 (3) ◽  
pp. 216-217 ◽  
Author(s):  
David J. Wolyn ◽  
Xiaorong Feng
Keyword(s):  
Anther Culture ◽  
Embryogenic Callus ◽  
Callus Formation ◽  
Temperature Treatment ◽  
Asparagus Officinalis ◽  
Embryo Recovery ◽  
Callus Production ◽  
Haploid Embryos ◽  
Incubation Temperatures ◽  
Embryogenic Callus Formation

Asparagus (Asparagus officinalis L.) anthers from flowers of field-grown plants were cultured for five genotypes, four incubation temperatures, and three sampling dates. Treatments were evaluated for total and embryogenic callus production. Incubating anthers at 35C was optimal for initiating embryogenic callus for three genotypes. Another line performed best and equally well at 29 and 32C, while one was recalcitrant to embryogenic callus formation at the temperatures evaluated. For all genotypes, almost half of the anthers produced callus for at least one temperature treatment, hut the percentage of these calli that was embryogenic ranged from 0% to 50%. Sampling date affected response only for specific genotype-temperature combinations. Embryo recovery ranged from six to 14 per callus. For the four responsive genotypes, 77% to 100% of plantlets was haploid. Culturing anthers at several temperatures ranging from 29 to 35C, with repeated samplings of flowers from the field, likely will allow recovery of haploid embryos from many selections. This result will expand the germplasm base to develop all-male asparagus hybrids.

scholarly journals A Comparative Study of Trust in Mobile Banking

2020 ◽  
Vol 28 (4) ◽  
pp. 95-119 ◽  
Author(s):  
Ravi Lonkani ◽  
Chuleeporn Changchit ◽  
Tim Klaus ◽  
Jomjai Sampet
Keyword(s):  
Comparative Study ◽  
Rapid Growth ◽  
Cross Cultural ◽  
Mobile Banking ◽  
Factors Influencing ◽  
Cultural Strategies ◽  
Mobile Phone Usage ◽  
Financial Transactions ◽  
Practical Implications ◽  
Significant Factors

With the rapid growth of mobile phone usage, mobile services have influenced many industries including banking. Mobile banking has become a popular service as it offers a convenient channel for customers to perform banking transactions. Nevertheless, not all customers feel safe performing financial transactions online. Trust has become a crucial element on whether customers choose to use mobile banking. As a comparative study, this research examines factors and bank customers' characteristics that influence trust in mobile banking between U.S. and Thai mobile banking customers. Three hundred and eight USA consumers and two hundred and fifty-two Thai consumers participated in this study. The results found multiple significant factors influencing trust and usage of mobile banking. This study expands on previous trust and mobile banking usage research and provides practical implications for cross-cultural strategies in mobile banking.

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