Physiology of gibberellins in conifers

1977 ◽  
Vol 7 (2) ◽  
pp. 299-325 ◽  
Author(s):  
R. P. Pharis ◽  
C. G. Kuo
Keyword(s):  
Seed Production ◽  
Vegetative Growth ◽  
Growth And Development ◽  
Tree Breeding ◽  
Early Flowering ◽  
Progeny Testing ◽  
Screening Techniques ◽  
Exogenous Application ◽  
Development Processes ◽  
Made In

The literature on endogenous gibberellins (GAs) of conifers, and on processes correlated with changes in GA-like substances, or processes affected by exogenous application of GAs is reviewed. It is now apparent that GAs mediate or influence many different growth and development processes in conifers, although just how they evoke the observed responses remains obscure.Practically, the use of certain GAs on conifers should allow advances to be made in the areas of tree breeding (i.e. the promotion of early flowering) and enhancement and regularization of seed production. The possible use of GAs to enhance early vegetative growth is feasible for many species. The use of endogenous GA levels, rate of synthesis, or metabolism as screening techniques in progeny testing, while still speculative, appears attractive.

scholarly journals Progeny Testing Preceded by Phenotypic Pre-selection – Timing Considerations

2004 ◽  
Vol 53 (1-6) ◽  
pp. 20-26 ◽  
Author(s):  
Darius Danusevičius ◽  
D. Lindgren
Keyword(s):  
Gene Diversity ◽  
Field Testing ◽  
Tree Breeding ◽  
Rate Of Change ◽  
Early Flowering ◽  
Progeny Test ◽  
Common Element ◽  
Progeny Testing ◽  
Two Stage

Abstract Progeny-testing is a common element in tree breeding. It takes long time until trees reach the sexual maturity. That time could be used for field testing followed by progeny-test of the selected phenotypes (two-stage strategy), or the time until mating could be reduced by forcing early flowering (singlestage strategy). Benefit of phenotypic pre-selection followed by progeny testing in long-term breeding was assessed as a function of the age at the pre-selection by the aid of a deterministic tree breeding simulator. As a criterion of goodness of a breeding program, annual progress in group merit (GM/Y-refers to the rate of change in the average of genetic gain and gene diversity) at a total budget constraint was used. For simplicity, a long-term program with balanced selection was studied. Scenarios with different genetic parameters, cost and time components were evaluated and optimised for resource allocation. At the optimum age of mating for progeny test, two-stage Phenotype/ Progeny strategy generated higher GM/Y than singlestage Progeny strategy at the age of mating for progeny test equal to three years, except for a typical scenario with weak JM correlation, low heritability and long rotation time. High heritability, short rotation and strong J-M genetic correlation favoured phenotypic pre-selection. Optimum age for phenotypic pre-selection varied from 6 to 17 years and the percentage of GM/Y lost in comparison to the maximum due to delay of mating for the progeny test until age 15 and 25 years ranged from 0 to 14% and from 1 to 29%, respectively. In the case of low heritability, long rotation, low J-M correlation, high cost for cycling and low budget, early mating age would bring little benefit if compared to mating at the optimum age. We suggest that, in long-term breeding based on progeny testing, investment in phenotypic pre-selection is more beneficial than investment to achieve early flowering to initiate the progeny test early.

scholarly journals Effects of Seasonal Variation and Gibberellic Acid Treatment on the Growth and Development of Gypsophila paniculata

HortScience ◽  
2019 ◽  
Vol 54 (8) ◽  
pp. 1370-1374
Author(s):  
Fan Li ◽  
Guoxian Wang ◽  
Rongpei Yu ◽  
Min Wu ◽  
Qinli Shan ◽  
...  
Keyword(s):  
Gibberellic Acid ◽  
Vegetative Growth ◽  
Growth And Development ◽  
Acid Treatment ◽  
Early Flowering ◽  
Low Latitude ◽  
Planting Time ◽  
Gypsophila Paniculata ◽  
Autumn And Winter ◽  
Gibberellic Acid Treatment

We investigated the effects of different planting seasons and gibberellic acid treatments on the growth and development of Gypsophila paniculata to explore new approaches to controlling the flowering period. Four different cultivars were selected and continually planted in July, September, and November in the low-latitude and high-altitude region of Kunming, China (25° N, 102° E). Results showed that the vegetative growth and flowering time of Gypsophila paniculata were prolonged and postponed when the planting time was delayed. Specifically, ‘My Pink’ showed 20% and 80% rosette rates when grown in autumn and winter, respectively, thus indicating that Gypsophila paniculata is sensitive to planting time. Moreover, GA3 treatment not only can significantly promote vegetative growth but also can stimulate early flowering and suppress the occurrence of rosettes during winter. This is more specific to ‘My Pink’, which showed 40% and 80% reductions in rosette rates with four and eight GA3 treatment applications, respectively. Our study showed that seasonal variations in the growth and development of Gypsophila paniculata and GA3 treatment can effectively stimulate early flowering and suppress rosettes during winter.

Further Studies on Coenurus glomeratus

1940 ◽  
Vol 18 (2-3) ◽  
pp. 95-102 ◽  
Author(s):  
Phyllis A. Clapham
Keyword(s):  
Old Age ◽  
Vegetative Growth ◽  
Growth And Development ◽  
Small Area ◽  
Cyst Formation ◽  
Daughter Cyst ◽  
New Hosts ◽  
Growth And Reproduction

The structure of the normal coenurus of M. glomeratus is described and some observations have been made on its powers of budding and vegetative growth and reproduction. It is suggested that only a small area of the cyst has the power of growth and development and that budding and daughter cyst formation is an action which attempts to stave off old age and sterility. It has been found possible to cause new growths and infections by the transplantation of certain elements to new hosts. Some remarks are made on the occurrence of abnormalities in a coenurus cyst.

scholarly journals Collection season and auxin treatment in the propagation by cuttings of mandarin hybrids

2016 ◽  
Vol 46 (2) ◽  
pp. 215-221 ◽  
Author(s):  
Andrés Iván Prato Sarmiento ◽  
Paulo Vitor Dutra de Souza ◽  
Sergio Francisco Schwarz
Keyword(s):  
Experimental Design ◽  
Vegetative Growth ◽  
Late Spring ◽  
Indolebutyric Acid ◽  
Rooted Cuttings ◽  
Exogenous Application ◽  
Auxin Treatment ◽  
Randomized Experimental Design

ABSTRACT Propagation by cuttings is an alternative for obtaining citrus rootstocks. The exogenous application of indolebutyric acid (IBA), cutting collection season and genotypes used may affect the rooting and vegetative growth of citrus rootstocks cuttings. Two experiments were conducted to study the influence of these factors. In the first one, semi-hardwood cuttings from the 'Sunki' mandarin hybrids H49 and H77 were collected in the fall and late spring of 2013 and treated with IBA (0 mg L-1, 1,500 mg L-1 and 3,000 mg L-1). For each collection season, a 2 x 3 (two genotypes x three IBA concentrations) factorial scheme was adopted, in a randomized blocks design. In the second experiment, the development of cuttings that rooted in the late spring was evaluated until grafting. In this case, a completely randomized experimental design was adopted, with the hybrids H49 and H77. The IBA treatments positively influenced rooting and number of roots only in the fall collection, peaking at 23.3 % of rooted cuttings. In the late spring collection, rooting was close to 100 %, with the IBA treatment being unnecessary. Around 50 % of cuttings from the 'Sunki' mandarin hybrids were ready for grafting at 14 months after cutting.

scholarly journals Desarrollo de Sistema Portable para al Medición del Gasto Energético

2019 ◽  
Author(s):  
David Alexander Urrego-Higuita
Keyword(s):  
Heart Rate ◽  
Energy Consumption ◽  
Gas Sensors ◽  
Indirect Calorimetry ◽  
Growth And Development ◽  
Living System ◽  
Human Being ◽  
Research Paradigm ◽  
Calibration Protocol ◽  
Development Processes

Every living system consumes energy for its growth and development processes, in the human being it becomes a research paradigm, where the aim is to determine the interaction of man with his environment and the transformation of the energy coming from food.For your study there are different techniques which differ in their level of specialization, cost and accuracy, these are divided into predictive, estimating and measurement. For this project a system that seeks to determine the energy consumption during different states is developed, due to the variability of conditions in which the study of energy consumption is developed, different techniques are established such as indirect calorimetry and the conditions for the evaluation by means of accelerometers and the study of heart rate, where a record of the related variables is made through a computational applicationFinally, the behavior of the prototype in different resting states is evaluated, as well as the evaluation of the sensors used in indirect calorimetry, where evaluation tests of the gas sensors and calibration protocol for the flow sensor are defined.

scholarly journals FOREIGN DIRECT INVESTMENT IN INDIA: A TREND ANALYSIS

10.36713/3205 ◽  
2020 ◽  
pp. 57-64
Author(s):  
Rudresha C. E
Keyword(s):  
International Economic ◽  
Foreign Direct Investment ◽  
Economic Integration ◽  
Growth And Development ◽  
Direct Investment ◽  
Policy Reforms ◽  
New Economic Policy ◽  
Fdi Inflows ◽  
Indian Economy ◽  
Made In

International economic integration plays a significant role in the growth and development of any country, whether rich or poor. And foreign direct investment (FDI) is one of the major components in the process of achieving international economic integration in any economy. As is known, FDI serves as a link between investment and savings. This is true even in the case of India which is facing the deficit of savings and which can be addressed with the help of FDI. It (i.e., FDI) also helps in raising the growth and development of the economy. India is one of the leading markets at the global level. It has emerged as one of the attractive destinations in the world with a significant change in the inflow of FDI. The journey of FDI is very interesting with the introduction of liberalized policy through new economic policy 1991 and also other policy reforms of Government of India. It has witnessed a drastic change in the inflow and direction of foreign investment in Indian economy. In this backdrop, an attempt is made in this paper to examine country-wise, sector-wise and region-wise FDI inflows in Indian economy during last 19 years, 2000-01 to 2018-19. KEY WORDS: Economic Integration, Foreign Direct Investment, Developing Nations, Savings, Policy Reforms

scholarly journals UTILIZATION OF CORK AS COOLER BAG MAKING MATERIALS FOR DAIRY BREAST MILK AS AN EXCLUSIVE BREAST MILK COVERAGE ON WORKING MOTHER

2019 ◽  
Vol 4 (1) ◽  
pp. 38-44
Author(s):  
Bina Melvia Girsang ◽  
Farida Linda Sari ◽  
Nur Afi Darti
Keyword(s):  
Breast Milk ◽  
Community Service ◽  
Growth And Development ◽  
Working Mothers ◽  
Infant Health ◽  
Health Workers ◽  
Working Mother ◽  
Health Counseling ◽  
Self Learning ◽  
Made In

Working mother factors, lack of knowledge about the benefits of breast milk, and the low support of assisting health workers are factors that influence the achievement of exclusive breast milk targets. The method of implementing community service activities was carried out with health counseling and assistance in the manufacture of milk bag milk milk cooler for 20 breastfeeding working mothers. Making cooler bags using cork as a material that is easily available and economical, is a breakthrough that can be made in helping to achieve exclusive breastfeeding programs. The purpose of this community service is to empower mothers through making cooler bags that are expected to improve the skills and confidence of working mothers in providing breast milk. The implementation of community service shows the results that mothers understand about the benefits of breast milk (80%), the statement of the attitude of mothers who are willing to milk breast milk in the workplace (80%), and all mothers are able to play a role in making cooler bags independently. Communities can learn independently (self learning) and can share experiences in preventing and tackling infant health, especially in fulfilling breast milk for infant growth and development

scholarly journals The effect of the photoperiod on the level of endogenous growth regulators in pine (Pinus silvestris L.) seedlings

2014 ◽  
Vol 51 (1) ◽  
pp. 59-70 ◽  
Author(s):  
Krystyna Kriesel ◽  
Sławomir Ciesielska
Keyword(s):  
Abscisic Acid ◽  
Growth And Development ◽  
Morphological Characters ◽  
Axillary Buds ◽  
Pinus Silvestris ◽  
Low Intensity ◽  
Pine Seedlings ◽  
Terminal Bud ◽  
Development Processes ◽  
High Level

The investigations were performed on pine seedlings growing under 12, 16 and 20 hour photoperiods. In 4 succesive stages of seedling development i.e. after 2, 12, 18 and 30 weeks of culture morphological characters of the seedlings were measured and the levels of auxins-, gibberellins-, cytokininsand abscisic acid-like inhibitor were determined. The intensity of growth and development of juvenile leaves, needles and of the shoot was the lowest in plants growing under 12 hour photoperiod conditions. As the length of the photoperiod increased so did the intensity of these processes. Under the 12 hour photoperiod the development of scale leaves, axillary buds and the formation of the terminal bud started earliest. This process reached completion under the 12 hour photoperiod and the bud remained in a state of dormancy. Seedlings growing under the 12 hour photoperiod were characterized by a low level of stimulators, and at the same time by a high level of inhibitors. On the other hand in seedlings grown at 16 and 20 hour photoperiods the content of stimulators was higher and that of inhibitors lower. A high intensity of growth and development processes was correlated with a high level of stimulators while a high level of inhibitors was correlated with a low intensity of these processes.The obtained results suggest the participation of gibberellins and cytokinins in the processes of regulation of the initiation of scale leaves and axillary buds, and the participation of these hormones and of abscisic acid in the regulation of needle elongation.

Education Attainment and Feminization of Labor Markets in Arab Countries with Comparisons to Eastern and Central European Countries

2014 ◽  
pp. 292-311
Author(s):  
Fatima-Zohra Filali Adib ◽  
Amale Achehboune
Keyword(s):  
Human Resources ◽  
Labor Markets ◽  
Growth And Development ◽  
Arab Countries ◽  
Education Attainment ◽  
Central European ◽  
Developed Economies ◽  
Participation Of Women ◽  
Development Processes

The feminization of labor markets through the role of education is among the means that enhance the participation of women to development and ensure further involvement of human resources in the growth and development processes. While this is a process that is highly pursued in most developed economies, it is not clearly seen to be pervasive in most developing countries. The Arab economies are among those countries where lower participation of women is observed but where education can be an important leverage for further feminization of labor markets. These issues are discussed in the present chapter to underline the role of education in Arab economies.

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