Role of Apomixis in Perpetuation of Flowering Plants: Ecological Perspective

Author(s):  
Roopam Sharma ◽  
Vishnu Bhat
2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Yaarit Kutsher ◽  
Michal Fisler ◽  
Adi Faigenboim ◽  
Moshe Reuveni

AbstractIt is widely known that during the reproductive stage (flowering), plants do not root well. Most protocols of shoot regeneration in plants utilize juvenile tissue. Adding these two realities together encouraged us to study the role of florigen in shoot regeneration. Mature tobacco tissue that expresses the endogenous tobacco florigen mRNA regenerates poorly, while juvenile tissue that does not express the florigen regenerates shoots well. Inhibition of Nitric Oxide (NO) synthesis reduced shoot regeneration as well as promoted flowering and increased tobacco florigen level. In contrast, the addition of NO (by way of NO donor) to the tissue increased regeneration, delayed flowering, reduced tobacco florigen mRNA. Ectopic expression of florigen genes in tobacco or tomato decreased regeneration capacity significantly. Overexpression pear PcFT2 gene increased regeneration capacity. During regeneration, florigen mRNA was not changed. We conclude that florigen presence in mature tobacco leaves reduces roots and shoots regeneration and is the possible reason for the age-related decrease in regeneration capacity.


Author(s):  
S. Sharma

The concept of e-governance in the modern times refocuses on the fundamental role of government as the institution of transformation of society. To understand the intricacies of e- governance it will be pertinent to examine the concept from an ecological perspective. The system of governance in order to meet the challenges must equip itself with the mechanisms of managing the pressures generated from different subsystems. The interrelationship and interdependence of these subsystems explain the operational reality of bureaucratic systems in relation to societal transformation. In last few decades, the history of humankind has seen the enormous growth of technology and its utilization for creating a better global society, by disseminating the knowledge down to common person and transcending the geographical boundaries. The accessibility of knowledge is not confined to any nation. Thus, the whole world has to acquire a bigger vision of coexistence with divergent societal patterns in future, because it is the source of developing shared visions. The present analysis focuses on the normative aspects of e-connectivity, specifically, 1. It proposes a conceptual framework to understand the futuristic operational dynamics of ecology of e-governance; 2. It proposes how the interactions of various components of e-governance, can help in evolving a universal society with ethical axis to create a better world; 3. It suggests that the whole world eventually has to move in the direction of evolving a global society by inculcating universal values of coexistence with divergent ethos. Hence, the need to transform the society cannot be subdued; and 4. It focuses on striving a balance between technological and human aspects by bringing out philosophical core at the centre to evolve global society.


1978 ◽  
Vol 7 (1) ◽  
Author(s):  
Urie Bronfenbrenner

ZusammenfassungDie Rolle des Kindes in der Gesellschaft wird als Funktion von Stabilität und Wandel der ökologischen Umwelt betrachtet. Diese umfaßt nicht nur die unmittelbare Umgebung der sich entwickelnden Personen, sondern auch die weiteren Kontexte formeller und informeller Natur, in die jene Umgebung eingebettet ist. Unter methodischen Gesichtspunkten betont der Ansatz die Anwendung genau geplanter natürlicher und künstlicher Experimente, mit denen bereits in frühen Stadien des Forschungsprozesses begonnen wird. Die sich verändernden Beziehungen zwischen Person und Umwelt werden mit Systembegriffen analysiert. Diese Systemeigenschaften werden in einer Reihe von Aussagen dargestellt, welche jeweils durch konkrete Beispiele aus der Forschung illustriert werden.


2004 ◽  
Vol 104 (2) ◽  
pp. 109-124 ◽  
Author(s):  
John P. Tracey ◽  
Rupert Woods ◽  
David Roshier ◽  
Peter West ◽  
Glen R. Saunders

Author(s):  
P. R. Bell

SynopsisArguments based on their technical advantages, undoubted antiquity and lack of evolutionary extravagances are advanced for promoting the study of the Pteridophyta. Sound interpretations of fundamental aspects of the land plants, together with useful knowledge, are likely to follow, and grievous errors arising from too great a concentration on the flowering plants can be avoided.


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