Author: L. Neville WilsonPublisher:
ISBN:
Category :
Languages : en
Pages : 160
Book Description
Nitrate Reductase Activity in Alfalfa (Medicago Sativa L.)
Author: L. Neville WilsonGenetic Variability and Inheritance of Nitrate Reductase Activity in Alfalfa and Its Association with Forage Yield
Author: David Loren NelsonPublisher:
ISBN:
Category : Alfalfa
Languages : en
Pages : 184
Book Description
Host Plant Metabolism of Symbiotically Fixed Nitrogen in Alfalfa (Medicago Sativa L.) Root Nodules
Author: Randall Gene GroatSelection for Traits Associated with Dinitrogen Fixation and Nitrogen Assimilation in Alfalfa (Medicago Sativa L.)
Author: Nicholas Ray DegenhartPublisher:
ISBN:
Category :
Languages : en
Pages : 160
Book Description
Nitrogen Nutrition of Seedling Alfalfa (Medicago Sativa L.)
Author: Bertrand D. EardlyPublisher:
ISBN:
Category : Alfalfa
Languages : en
Pages : 220
Book Description
Nitrogen fertilization of seedling legumes is a controversial practice intended to provide N to the plant during periods when seed N, soil N, and N2 fixation may not meet plant requirements; eg. prenodulation, postharvest, or in the event of an inoculation failure. Field experiments were conducted in 3 consecutive years (1980, 1981, and 1982) on a Woodburn silt loam soil (Aquultic Argixeroll) containing low soil N to evaluate the effect of 9 rates of NH4 NO3 -N (0-224 kg N ha−1) on nodulation, acetylene reduction (AR), percentage herbage N, percentage nitrate N, and dry matter yield of seedling alfalfa (Medicago sativa L. cv. 'Apollo'). The R. meliloti at the field site were found to be ineffective at N2 fixation, thus an inoculation treatment was added in 1982 by the use of a split-block design. The response of the variables to applied N was evaluated at 10 weeks, and over a postharvest time course. At ten weeks after planting, only the uninoculated, ineffectively nodulated plants exhibited increased herbage yield and %N in response to the applied N. All rates of N fertilization decreased nodulation and AR in a curvilinear response, regardless of rhizobial effectiveness. The applied NH4NO3 continued to decrease AR and nodulation of seedlings through the third week after the initial harvest. Acetylene reduction activity of control plants dropped to 68% of preharvest levels at 2 to 4 days postharvest, then recovered during the next 4 weeks. Herbage nitrate N was increased in one year out of three. Dry matter yield and total herbage N of uninoculated plants were increased during the initial growing season, and unaffected the following spring. Since the inoculated plants showed little response to the N rates, except for decreased N2 fixation, it was concluded that during establishment, managerial emphasis should be placed on inoculation rather than N fertilization to obtain a consistent source of N for herbage protein. An ancillary investigation was conducted to characterize native Rhizobium taken from uninoculated, ineffectively nodulated, M. sativa nodules. Results suggested that Phaseolus vulgaris L. may be an alternate host for the native Rhizobium. Agricultural implications of this finding were discussed.
Agronomy and Plant Genetics at the University of Minnesota
Author: Environmental Physiology
Author: A. HemantaranjanPublisher: Scientific Publishers
ISBN: 9387307522
Category : Technology & Engineering
Languages : en
Pages : 858
Book Description
The innovative theme of the book entitled Environmental Physiology is basically molecular physiology of abiotic stress response in plants. This has been especially edited for realistic and rational utilization by planners, scientists, investigators, academicians and postgraduate students. This book is an exceptional assimilation of well-timed, crucial and comprehensive twenty-one worthy reviews of diverse significance contributed by sincere dedication of experienced, laudable and well-known scientists/ stalwarts all over the world. The genuineness that due to incredible harmony with the world scientists of various disciplines developed in the last eight years, over nineteen Indian and twenty-nine foreign intellectuals enthusiastically came forward and associated in this extensive project of pragmatic importance. In fact, this kind of momentous work cannot be accomplished effectively and productively by a single person belonging principally to a specific field of specialization. This is also strongly realized that there is progressively more a need of united effort of experts in the ground-breaking work of precise importance above all in the agricultural sciences, which absolutely depends on environmental situations. The intricacies of abiotic and biotic stresses on growth and development of plants have been understood in the last few decades. This is the right time to apply the knowledge acquired in this direction, out of exhaustive research throughout the globe, in anyhow enhancing yield of crop plants cultivated under a variety of environmental stresses, in general, and extending basic research, in particular, for having more insight in establishing new cultivars under higher intensities of abiotic stresses like drought, high and low temperature, salinity, sodicity, flooding, mineral, oxidative, heavy metals, etc. This book too is an endeavour to make aware the young workers with allied techniques comprising destructive and non-destructive methods for extending relevant research incessantly in the years to come to gain further information of both basic and applied significance for sustainability of agriculture under environmental stresses. The manifold ideas on basic problems of the present and the future as well as resolutions have been consolidated through precious reviews by distinguished personnel of plant sciences in twenty-one chapters. In this enthusiastic and forceful enterprise, the real appreciation is due to all notable and brilliant authors, for bringing up most needed unrivalled, practical, thoughtful and comprehensive reviews of international standard on physiology of plants and their responses under wide-ranging environmental stresses. Hopefully, the wonderful multifaceted reviews selected and compiled very systematically in this exclusive book for the first time by genuine experts and distinguished scientists would enable to plan meaningful advanced research and profuse consequential teaching on the extremely crucial theme of abiotic stress responses in plants. This unique collection must be of enormous help for post-graduate studies and higher research in all disciplines of plant science in every university and research institute of the world.
Symbiotic Nitrogen Fixation
Author: P. GrahamPublisher: Springer Science & Business Media
ISBN: 9401110883
Category : Science
Languages : en
Pages : 206
Book Description
During the past three decades there has been a large amount of research on biological nitrogen fixation, in part stimulated by increasing world prices of nitrogen-containing fertilizers and environmental concerns. In the last several years, research on plant--microbe interactions, and symbiotic and asymbiotic nitrogen fixation has become truly interdisciplinary in nature, stimulated to some degree by the use of modern genetic techniques. These methodologies have allowed us to make detailed analyses of plant and bacterial genes involved in symbiotic processes and to follow the growth and persistence of the root-nodule bacteria and free-living nitrogen-fixing bacteria in soils. Through the efforts of a large number of researchers we now have a better understanding of the ecology of rhizobia, environmental parameters affecting the infection and nodulation process, the nature of specificity, the biochemistry of host plants and microsymbionts, and chemical signalling between symbiotic partners. This volume gives a summary of current research efforts and knowledge in the field of biological nitrogen fixation. Since the research field is diverse in nature, this book presents a collection of papers in the major research area of physiology and metabolism, genetics, evolution, taxonomy, ecology, and international programs.
Author: Ian M. Ray
Author: