Bücher von Ashwani Kumar

Although boron (B) is a micronutrient, it is frequently found at toxic concentrations in soils and ground waters in arid and semi-arid conditions worldwide. Boron poses a challenge as its management is difficult due to its high permeability and presence as an uncharged molecule at physiological pH. B is now recognized as a toxic component of the saline milieu which interacts with salinity and further aggravates its toxic effects. Interactions between salinity and B toxicity are rather complex. The mechanism of boron uptake under saline conditions is not well known. Under saline and excessive B conditions, absorption and translocation of B by passive diffusion might be inhibited by decreased transpiration rates. Inadequate information regarding the response of plants to the combination of excess B and salinity on plant growth and yield is available. So, this study was undertaken to analyze and compare the combined effect of boron and salinity and to evaluate the response of wheat varieties differing in their tolerance to boron and salinity stresses.

The present investigation entitled, ¿Population dynamics and management of cabbage white butterfly, Pieris brassicae (Linn.) in district Sultanpur (U.P)¿ was carried out at the Farmer field, village Bhain, district Sultanpur, U.P. during the rabi season 2012-13 and 2013-14. In order to see the incidence and management of invasive pest i.e. cabbage white butterfly, which is a regular pest and causing heavy damage in the Himachal Pradesh, some parts of Uttarakhand and U.P.,. Incidence of this pest is studied to plan the dates of sowing, in order to escape the pest infestation. Management is done with the chemicals and bio pesticides to minimize the indiscriminate use of insecticides for the pest i.e. cabbage white butterfly (Pieris brassicae). Laboratory study was also carried apart from the field work on biology of cabbage white butterfly and mortality of catterpillars against certain chemical and bio-pesticides. Studies on the incidence of cabbage white butterfly (Pieris brassicae) population with weather parameters given in table 4.1, figure 4.1 and table 4.2, figure 4.2. The occurrence of cabbage white butterfly (Pieris brassicae) was commenced from 4th standard week.

Introduction.- Historical Developments of Cell and Tissue Culture Techniques.- Callus Cultures.- Cell Suspension Cultures.- Protoplast Cultures.- Haploid Techniques.- Plant Propagation: Meristem Cultures, Somatic Embryogenesis Micropropagation, and Transformation of Somatic Embryos in Bioreactors.- Some Endogenous and Exogenous Factors in Cell Culture Systems.- Primary Metabolism.- Secondary Metabolism.- Phytohormones and Growth Regulators.- Cell Division, Cell Growth, Cell Differentiation.- Genetic Problems and Gene Technology.- Summary of Some Physiological Aspects in the Development of Plant Cell and Tissue Culture.

This book is an exposition of how political, cultural, historical, and economic structures and processes shape the nature and character of curriculum landscapes globally.