Download or read book Development and Characterization of Texas Bluegrass X Kentucky Bluegrass Interspecific Hybrids for the Southern United States written by Meghyn Brianne Meeks and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Kentucky bluegrass (Poa pratensis L.) and tall fescue (Festuca arundinacea Schreb.) are commonly grown cool-season grasses in the United States for home lawns and various sports turf applications. However, environmental conditions such as prolonged periods of drought and heat as well as heavy shade often result in a loss of visual appeal, early dormancy, or death of the turf stand. Hybrid bluegrass (Poa spp.) cultivars derived from Texas bluegrass (P. arachnifera Torr.) x Kentucky bluegrass interspecific crosses may serve as viable alternatives for perennial turfgrass in the southern United States. Methods to aid in the breeding and selection of Texas x Kentucky bluegrasses for these environmental conditions would be useful. The goals of this research were to 1) develop new interspecific hybrid bluegrasses and optimize a seed germination technique, 2) use flow cytometry and molecular markers for the characterization of hybrid progeny, and 3) evaluate the growth response and performance of hybrid bluegrasses maintained in shade. In 2012 and 2013, controlled pollinations were made between different Poa species. Seed from these crosses were germinated through two different techniques that resulted in 61 new interspecific hybrids. A higher percentage of individuals (89%) were recovered through germination on nutrient agar medium than soil. In addition to these hybrids, 52 Texas x Kentucky hybrids created in 2001 were tested for three years in multiple locations across the southern states and the transition zone. Experimental hybrid TAES 5653, registered as DALBG 1201, was the superior genotype. Flow cytometry was used to estimate the DNA content of 19 Texas bluegrass genotypes, and four Texas x Kentucky bluegrass hybrids from two different pedigrees. Variability in DNA content suggested variability in the ploidy levels of Texas bluegrass. Texas x Kentucky bluegrass interspecific hybrids had an intermediate DNA content demonstrating flow cytometry can identify true hybrids between parents with vastly different DNA content. A thioredoxin-like (trx) nuclear gene was also useful in identifying true Texas x Kentucky bluegrass hybrids. A distinctive 851 bp trx allele with a 163 bp insertion site was also identified. The insertion is evidently a transposable element that may help to elucidate ancestors of Texas bluegrass. Another study was conducted to develop a method of comparing Texas x Kentucky bluegrass hybrids to commercial cultivars for shade tolerance. It was determined that evaluations should be conducted in the spring to early summer months using moderate shade (50%) levels, and high turfgrass quality and slower leaf elongation rates as selective traits. Trinexapac-ethyl was not necessary to reduce the leaf elongation rate or increase quality of dwarf hybrids under shade. In summary, several methods have been tested to generate and evaluate new Texas x Kentucky bluegrass hybrids. Seed germination conducted under controlled conditions using agar medium, and flow cytometry and the trx nuclear gene can be employed in bluegrass breeding programs to identify true interspecific hybrids. Finally, improved dwarf-type hybrid bluegrasses, such as DALBG 1201 and TAES 5654, seem to have enhanced shade tolerance and potential for use as perennial turfgrass alternatives in the southern and transition zone regions of the United States. The electronic version of this dissertation is accessible from http://hdl.handle.net/1969.1/155246

Download or read book Performance of Texas Bluegrass Hybrids in the Transition Zone written by and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: High temperature and drought may reduce quality in cool-season turfgrasses during summer in the transition zone. Texas bluegrass hybrids (HBG) are genetic crosses between native Texas bluegrass (Poa arachnifera Torr.) and Kentucky bluegrass (Poa pratensis L.) (KBG) that resemble KBG but may have greater drought and heat resistance than other cool-season grasses. The objectives of four studies were to evaluate high temperature, drought, and lower mowing height effects on HBG compared with KBG ('Apollo') and tall fescue (Festuca arundincea Schreb.)(TF, 'Dynasty'), compare their rooting characteristics, and investigate their membrane lipid molecular species compositional differences. Under high temperature (35/25[degrees]C, 14h light/10h darkness), HBG ('Thermal Blue') had greater quality and gross photosynthesis (Pg), and lower electrolyte leakage than KBG and TF in a growth chamber study. The combination of high temperature and drought (60% ET replacement) caused rapid declines in quality, but HBG generally performed better. In field and greenhouse studies, TF had more roots deeper in the profile than two HBG ('Reveille' and Thermal Blue) and KBG under well-watered conditions. In the field, quality and Pg were greatest in TF among turfgrasses. Performances in quality and Pg generally ranked: TF> Reveille>= Thermal Blue = KBG. In a separate mowing height and drought field study, HBG (Thermal Blue) generally had lower quality and Pg than KBG at both high (7.62 cm) and low (3.81 cm) heights but particularly at the low height. Drought resistance and tolerance to low mowing in Thermal Blue was similar to or poorer than in KBG. Under supra-optimum temperature (35 /25[degrees]C and 40 /30[degrees]C, 14h light/10h darkness), the ratio of digalactosyldiacylglycerol (DGDG) to monogalactosyldiacylglycerol (MGDG) was highest in HBG (Thermal Blue) and lowest in TF. Heat tolerance was also associated with higher phosphatidylethanolamine (PE) content, higher phosphatidylglycerol (PG) content, and reduced overall unsaturation compared with heat-sensitive. Results suggest that 40 membrane lipid molecules are potential biomarkers for heat tolerance and that compositional changes in lipids in response to heat may contribute to differences in heat tolerance among cool-season grasses. Generally, studies indicated greater heat resistance, but not drought resistance, in HBG than in KBG or TF.

Download or read book Physiological Morphological and Spectral Reflectance Characteristics of Kentucky Bluegrass Texas Bluegrass and Their Hybrids in Response to Water Stress written by Ploense Mary Rebecca and published by . This book was released on 2002 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Adulteration and Misbranding of the Seeds of Kentucky Bluegrass and Redtop written by United States. Department of Agriculture and published by . This book was released on 1914 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Effects of Weed Control and Fertilization on Botanical Composition and Forage Yields of Kentucky Bluegrass Pasture written by Elroy John Peters and published by . This book was released on 1971 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Annual Meetings Abstracts written by American Society of Agronomy and published by . This book was released on 1998 with total page 460 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book An Econometric Analysis of the United States Kentucky Bluegrass Seed Industry written by Washington State University. College of Agricultural Research and published by . This book was released on 1978 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book National Kentucky Bluegrass Test 1990 written by and published by . This book was released on 1996 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Kentucky Bluegrass Seed written by Adrian John Pieters and published by . This book was released on 1902 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Kentucky Bluegrass Seed written by Adrian John Pieters and published by Legare Street Press. This book was released on 2022-10-27 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work is in the "public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.

Download or read book Kentucky Bluegrass in Missouri written by Bascom Milton King and published by . This book was released on 1927 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Econometric Analysis of the United States Kentucky Bluegrass Seed Industry written by Raymond J. Folwell and published by . This book was released on 1978 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Kentucky bluegrass Seed Crop Reported Largest in 5 Years written by United States. Bureau of Agricultural Economics and published by . This book was released on 1947 with total page 2 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Kentucky Bluegrass Versus Hybrid Bluegrass for the Elimination of Sod Net in Production Turf type Tall Fescue written by Rhonda Conn Britton and published by . This book was released on 2006 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Kentucky Bluegrass written by V.D. Meier and published by . This book was released on 1989 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: A variety of Kentucky bluegrass having a high level of disease resistance, good turf performance, and a very high level of seed yield potential.

Download or read book Research on Roadside Development written by W. H. Daniel and published by . This book was released on 1967 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Vegetative Growth Development and Reproduction in Kentucky Bluegrass written by Morgan William Evans and published by . This book was released on 1949 with total page 39 pages. Available in PDF, EPUB and Kindle. Book excerpt: