Studies With Alfalfa Populations Selected For High Or Low Single Plant Yield
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Studies With Alfalfa Populations Selected For High Or Low Single Plant Yield
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Author : Mark Howard McCaslin
language : en
Publisher:
Release Date : 1976
Studies With Alfalfa Populations Selected For High Or Low Single Plant Yield written by Mark Howard McCaslin and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1976 with categories.
Dna Marker Assisted Selection To Improve Drought Tolerance In Alfalfa Medicago Sativa L
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Author : Ma Gina Maramara Babb
language : en
Publisher:
Release Date : 2014
Dna Marker Assisted Selection To Improve Drought Tolerance In Alfalfa Medicago Sativa L written by Ma Gina Maramara Babb and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with Alfalfa categories.
Alfalfa is a perennial forage legume grown extensively under both rainfed and irrigated conditions. It is the most important forage crop and the third most valuable crop in the United States of America. Alfalfa production is affected by abiotic stress factors such as drought that causes plant yield reduction. Because of this, plant breeding efforts are geared towards breeding for crop drought tolerance. Most traits governing drought tolerance are influenced buy multiple genes, referred to as quantitative trait loci (QTL), and environmental factors. The NMSU alfalfa genetics and breeding program previously conducted forage and root biomass QTL mapping experiments in two segregating alfalfa populations grown under drought-stressed field conditions. Ten shoot and root biomass QTLs were identified in that research and represented by 10 simple sequence repeat (SSR) DNA markers. These markers were selected for use in a marker assisted selection (MAS) experiment in alfalfa in the current study. MAS was imposed on the unselected control (C0) (base population) by selecting plants that possessed (+), or did not possess (-), specific combinations of DNA marker alleles associated with high shoot (HS), low shoot (LS), high root (HR), and low root (LR) biomass, all designated as Cycle 1. the Cycle 1 populations that possessed (+) the marker alleles and the C0 population were then crossed to the three cultivars Malone, Melton and Multileaf to develop 18 cultivar-MAS hybrids (referred to as Malone-MAS, Melton-MAS, and Multileaf-MAS). A total of 32 populations were evaluated for shoot biomass production under normal irrigation (NI) and limited irrigation (LI) field conditions during 2011 and 2012. The goal of this research study was to validate if these drought tolerance QTLs can be used to improve the performance of three elite cultivars for yield under NI and LI management. The impact of MAS on forage quality factors and leaf relative water content was also monitored. Results show that selection for high shoot biomass markers and high root biomass markers in the MAS-derived Cycle 1 populations improved forage yield by 23% and 20%, respectively in the LI study. IN addition, selection for the low shoot and low root biomass marker alleles in the same populations decreased forage yield by 3% and 15%, respectively, in the LI study. In the NI study, selection for HS3+ improved forage yield by 9% (not significant) while all other population yield differences were small. For the cultivar-MAS hybrids two superior Malone-MAS and Multileaf-MAS hybrids outperformed their respective parent cultivar by 6% and 19% in the LI study, and 6% and 7% in the NI study. While no Melton-MAS hybrids outperformed their drought tolerant Melton parent in the LI study, one of the hybrids yielded 7% more than Melton in the NI study. Forage quality results indicated that most of the MAS-derived Cycle 1 populations had significantly higher leaf to stem ratio (LSR) than the three cultivars and their cultivar-MAS hybrids under the LI and NI management. For the cultivar-MAS hybrids, results show that under the LI and NI studies, one and two Multileaf-MAS hybrids, respectively, had a significantly higher LSR than the Multileaf cultivar; five and six Malone-MAS hybrids, respectively, had a significantly higher LSR than the Malone cultivar; and four and six Melton-MAS hybrids, respectively, had a significantly higher LSR than the Melton cultivar. For leaf relative water content (RWC), no significant year by entry, or main entry effect on leaf RWC were detected among the 32 populations under LI and NI management. The rankings among the populations were inconsistent in both studies. The overall results presented in this study validated the past QTL experimental outcome that the marker effects were in the same direction as previously determined under well-watered and water-limited environments. This study also demonstrated that DNA MAS was effective at improving forage yield of three existing cultivars in both limited irrigation and normal irrigation management.
Alfalfa Management Guide
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Author : D. J. Undersander
language : en
Publisher:
Release Date : 2011
Alfalfa Management Guide written by D. J. Undersander and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with Alfalfa categories.
The Alfalfa Management Guide is designed especially for busy growers, with to-the-point recommendations, useful images of diseased plants and pests, and quick-reference tables and charts. Revised in 2011, this edition of Alfalfa Management Guide covers the latest strategies for alfalfa establishment, production, and harvest-soil testing, fertilizing, integrated pest management, rotation, and more.
Genetic Variability And Inheritance Of Nitrate Reductase Activity In Alfalfa And Its Association With Forage Yield
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Author : David Loren Nelson
language : en
Publisher:
Release Date : 1985
Genetic Variability And Inheritance Of Nitrate Reductase Activity In Alfalfa And Its Association With Forage Yield written by David Loren Nelson and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1985 with Alfalfa categories.
Plant Parasitic And Entomogenous Nematode Research
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Author :
language : en
Publisher:
Release Date : 1991
Plant Parasitic And Entomogenous Nematode Research written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with Nematodes categories.
Studies On The Expression And Inheritance Of Some Components Of Nutritional Quality In Alfalfa Medicago Sativa L Forage
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Author : James Enos Sumberg
language : en
Publisher:
Release Date : 1978
Studies On The Expression And Inheritance Of Some Components Of Nutritional Quality In Alfalfa Medicago Sativa L Forage written by James Enos Sumberg and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1978 with Alfalfa categories.
Identification Of Genes Involved In Environmental Adaption And Yield Traits In Forage And Other Ecologically Important Plants
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Author : Qiang Guo
language : en
Publisher: Frontiers Media SA
Release Date : 2023-11-07
Identification Of Genes Involved In Environmental Adaption And Yield Traits In Forage And Other Ecologically Important Plants written by Qiang Guo and has been published by Frontiers Media SA this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023-11-07 with Science categories.
The Influence Of Seeding Rate On Plant Population Yield And Quality Of Two Alfalfa Medicago Sativa L Varieties
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Author : Madhat M. Al-Hassani
language : en
Publisher:
Release Date : 1965
The Influence Of Seeding Rate On Plant Population Yield And Quality Of Two Alfalfa Medicago Sativa L Varieties written by Madhat M. Al-Hassani and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1965 with Alfalfa categories.
A field study was conducted in the Willamette Valley near Corvallis, Oregon, to determine the influence of seedling rate, drill row spacing, grass association, and variety on the yield of dry matter and quality (crude protein content and leafiness) of alfalfa. Treatments included seeding rates of 7.5, 10, 15 and 20 pounds per acre in various combinations with row spacings of 3, 6 and 12 inches. Orchardgrass (Dactvlis glomerata L.) was included tn three treatments. Complete data were obtained for three harvests and yield data only for an aftermath harvest. Alfalfa varieties were Vernal and DuPuits. Plant population and stem numbers per unit area increased with increasing seeding rates and with closer row spacing, but stem size, dry weight of the stems, leafiness and crude protein were not affected by seeding rate or row spacing. Grass grown in association with alfalfa did not influence any of the characteristics studied except for an increase in stem size at second harvest and increased protein content of the alfalfa at first harvest. Vernal and DuPuits yielded the same weight of dry material for the season. Vernal maintained a higher plant population, more stems per square foot at each harvest and a higher percentage of leaves than DuPuits. Stem size and weight and crude protein content of whole plants was higher in DuPuits than in Vernal. Both varieties decreased in yield, plant population, stem size and stem weight with each successive cutting. Stem number per square foot and per plant increased with each successive cutting. It was concluded that seedling rates from 7.5 to 20 pounds per acre and row spacings up to 12 inches had very little influence on quantity and quality of alfalfa hay production.
Crop Science
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Author :
language : en
Publisher:
Release Date : 1987
Crop Science written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1987 with Crop science categories.
Nitrogen Fixation By Selected Alfalfa Populations And Effects On A Succeeding Crop
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Author :
language : en
Publisher:
Release Date : 1985
Nitrogen Fixation By Selected Alfalfa Populations And Effects On A Succeeding Crop written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1985 with Alfalfa categories.
Uit onderzoek aan bestaande alfalfa-rassen blijkt een stimulerend effect op het volggewas, vergelijkbaar met 112 kg kunstmeststikstof per ha. Drie alfalfa-typen werden geselecteerd op een verhoogde acetyleen-reductie en onderzocht op de in de titel genoemde aspecten