Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 68 for “"resistant cultivars"”.
-
Intercropping with resistant cultivars reduces early blight and root knot disease on susceptible cultivars of tomato (Lycopersicon esculentum)
… to determine if disease on susceptible tomato cultivars is reduced by intercropping with resistant cultivars. A second objective was to investigate the mechanism of the disease reduction observed. Early blight (caused by Alternaria solani) rate of disease increase and lesion expansion were …
-
Control of fusarium head blight in wheat: I. Evaluation of host plant resistance and fungicides II. Molecular markers associated with QTL for resistance
… treatments can suppress FHB, the use of resistant cultivars is also an essential tool for control of FHB. Breeding for resistance to FHB has become a very large part of wheat and barley breeding programs in temperate climates. Various sources of resistance have been used to develop new …
-
Determination of soybean cultivar resistance to soybean cyst nematode with quantitative polymerase chain reaction
… of this pathogen is contingent on the use of resistant cultivars, thus screening for resistant cultivars is essential. The purpose of this research was to develop a method to assess infection of soybean roots by H. glycines with real-time quantitative Polymerase Chain Reaction (qPCR), a …
-
Association Between SCN Resistance and Yield in Soybean, And, QTL Mapping of Field Resistance to Sclerotinia Sclerotiorum in Soybean
… breeding for the development of SCN resistant cultivars with higher yield potential and the development of soybean cultivars with increased levels of resistance to Sclerotinia stem rot.
-
Responses of selected chickpea cultivars to imidazolinone herbicide
… of Saskatchewan, has developed chickpea cultivars with resistance to imidazolinone (IMI) class of herbicides. The objectives of this study were: (i) to examine the reaction of four chickpea cultivars – CDC Luna, CDC Corinne, CDC Alma, and CDC Cory - to imazamox, imazethapyr, and a …
-
Resistance to Walnut Anthracnose Development in Juvenile Leaves of Black Walnut Seedlings
… Early studies failed to identify functionally resistant cultivars of balck walnut to this disease. From previous artificial inoculation studies on greenhouse-grown seedlings, juvenile leaves were observed to be less infected than mature leaves. The mechanism(s) of juvenile-leaf resistance in …
-
Response of Soybean Iron and Manganese Deficiency
… more reliable and effective. Identification of resistant cultivars requires an understanding of the genetic inheritance for resistance, knowledge of the physiological mechanisms involved with resistance, and the development of reliable screening techniques to identify superior soybean cultivars. …
-
Regeneration and Transformation of Impatiens walleriana Using Cotyledonary Node Culture
… Impatiens Necrotic Spot Virus (INSV). A lack of resistant cultivars leaves growers with the sole option of destroying infected plants before INSV spreads throughout their entire crop. Therefore, the introduction of INSV resistant cultivars would have the potential to save Impatiens growers a …
-
Genetic Analysis of the Resistance of Soybean Genotypes to Sclerotinia Sclerotiorum
… stem rot in a cross between the partially resistant cultivars Asgrow 'A2506' (A2506) and Novartis 'S19--90' (S19--90); (iii) determine the inheritance of field resistance to sclerotinia stem rot in crosses between S19--90 and plant introductions (PIs) 358.318A, 391.589B, and 561.353; and …
-
An Evaluation of Unmanned Aircraft Systems' Ability to Assess Stripe Rust in Large Wheat Breeding Nursies
… impacts global wheat production, and resistant cultivars provide the most efficient method of control. High-throughput phenotyping using unmanned aircraft systems (UAS) offers a potentially more efficient method for field-based phenotyping compared to visual assessment. Here we tested …
-
Molecular Approaches to Facilitate Marker-Assisted Selection for Soybean Aphid Resistance in Soybean
… that Rag1 can be used for developing A. glycines resistant cultivars without an associated yield reduction in the Midwestern region of the USA.
-
Evaluation of rootstock and crop load effects on the performance of `Gibson Golden Delicious' and three scab-resistant apple cultivars
… Golden Delicious' apples' and three apple scab-resistant cultivars (Redfree, Liberty, and GoldRush).</p> <p>Two field research studies were conducted at the Iowa State Horticulture Research station near Ames, Iowa. The first experiment was conducted in an established `Gibson Golden Delicious' …
-
Host Plant Resistance in Strawberries to Anthracnose and Colonization of Crown and Root Tissue by Verticillium dahliae and Macrophomina phaseolina
… evaluate host resistance of anthracnose in 105 cultivars and elite breeding lines developed by six strawberry breeding programs. Cultivars and elite breeding lines were inoculated using three local isolates in both years. All breeding programs provided genotypes that had a wide range of …
-
Molecular Characterization of Sugarcane Yellow Leaf Virus (SCYLV) and its Effect on Sucrose Transporters in Sugarcane Saccharum spp. hybrids
… was determined by RT-PCR in several sugarcane cultivars, mostly from Hawaii. Interesting was the comparison of so-called susceptible versus resistant cultivars. As expected, the susceptible Hawaiian cultivars H73-6110 and H87-4094 showed strong PCR amplification products of SCYLV, while the …
-
Evaluating populations derived from complex crosses involving both bread wheat and durum wheat parentage for partial resistance to crown rot
… this potential loss, breeding of partially resistant cultivars could complement agronomic approaches. However, the limited variation in durum has meant that development of partially resistant lines is still a major objective to overcome. The aim of this study was to evaluate, through …
-
Phakopsora pachyrhizi growth in tissue of leaves from resistant and susceptible soybean germplasm
… color and sporulation has been observed among resistant soybean germplasm accessions that develop RB lesions. The objective of this study is to compare the reactions of accessions with different resistance symptoms to P. pachyrhizi infection. Ten soybean plant accessions were rated two weeks …
-
Evaluation and Identification of Soybean Aphid Resistance Sources and Mapping of Soybean Aphid Resistance Loci in Early Maturing Soybean Germplasm Accessions
… and thus will help to develop soybean aphid resistant cultivars. To identify new sources of resistance in early maturing soybeans, 330 soybean germplasm accessions from Maturity Group (MG) I, along with 11 resistant or susceptible checks, were evaluated against soybean aphid in greenhouse by …
-
Assessment of a Muscadine Grape (Vitis rotundifolia) Mapping Population for Tolerance to Pierce’s Disease Pathogen Xylella fastidiosa and Resistance to Black Rot Disease Pathogen Guignardia bidwellii
… for controlling these disease by developing resistant cultivars. Muscadine grape (<em>Vitis rotundifolia</em>) cultivar ‘Pam’ has been identified to possess a high level of resistance to diseases. To elucidate the genetic basis of the resistance to the causal pathogens <em>Xylella …
-
Management Strategies for Hop Downy Mildew Utilizing Fungicides and Host Resistance
… that significant interactions exist between cultivars, environments, and fungicidal compounds with regards to disease severity. With regards to host resistance, H. lupulus var. lupuloides E. Small accessions originating from the United States were highly-resistant to P. humuli compared to …
-
Molecular response of soybean (Glycine max (L.) Merr) to Phialophora gregata
… by the fungus Phialophora gregata. Several cultivars of soybean (Glycine max (L.) Merr.) show levels of resistance to attack by the fungus. In order to determine the mechanism of this resistance, the response of whole plants and soybean cells in culture was studied at the biochemical and …
Page 1 of 4