Download or read book Genetic Variability for Russian Wheat Aphid Diuraphis Noxia Resistance in South African Wheat Genotypes written by Vicki Louise Tolmay and published by . This book was released on 2006 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Investigation Into the Genetic Control of Russian Wheat Aphid Diuraphis Noxia Resistance written by Lavinia Kisten and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Molecular and Genetic Basis of Resistance to Russian Wheat Aphid Diuraphis Noxia written by Vinod Sharma and published by . This book was released on 2005 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Genetic Studies with Russian Wheat Aphid Diuraphis Noxia Mordvilko in PI 294994 Bread Wheat Triticum Aestivum L written by Ahmed A. Elsiddig and published by . This book was released on 1992 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: Russian wheat aphid (RWA), Diuraphis noxia (Mordvilko), is a widely distributed species in western north America, and a major economic pest of wheat (Triticum aestivum L.) and barley (Hordeum vulgare L.). The objectives of this study were to : 1) determine the inheritance of seedling and adult plant resistances in a wheat line PI 294994 ; 2) establish whether greenhouse and field resistances were related ; 3) determine the effect of RWA infestation on the dry matter, grain yield, and harvest index in the crosses Moro/PI 294994 and Hyak/PI 294994 ; 4) determine whether there was a difference in the three traits between different genotypes due to RWA infestation ; and, 5) assess the degree of protection genetic resistance provided in the two crosses. The club wheat cultivars 'Moro' and 4Hyak' were crossed with PI 294994. Progenies from these two crosses were artificially infested with RWA in the field and the crosses were compared for their dry matter, grain yield, and harvest index. Plant reactions of F2 seedlings, F2 adult plants, and F3 seedlings indicated that both seedling and adult plant resistances are controlled by two genes with dominant and recessive mode of inheritance and that plant reactions in the field were the same as those in the greenhouse. Comparison of mean values of dry matter, grain yield, and harvest index showed that the three traits were affected by RWA infestation and genotype in both crosses. Resistant genotypes and noninfested population were comparable with respect to the three traits in Moro/PI 294994 but they were not in Hyak/PI 294994.
Download or read book Biotypic Status of the Russian Wheat Aphid in Ethiopia written by Tesfay Belay Reda and published by LAP Lambert Academic Publishing. This book was released on 2012 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt: Diuraphis noxia is an insect pest on barley and wheat in Ethiopia. Yield losses of barley can reach up to 79%. Control is through use of resistant barley cultivars. Biotypes can render control with resistance uncertain. In this book it was indicated that no biotypic variation exist in RWA clones on barley in Ethiopia. Susceptibility of one resistant wheat line (Dn4) to the Ethiopian RWA clones indicated biotypic differences between American and Ethiopian RWA clones. Anholocyclic life cycle of RWA in Ethiopia, dependence on land races and fact that barley land races show tolerance to RWA support the finding of no biotypic variation in the Ethiopian RWA clones. It was also indicated in the same book that molecular markers like mtDNA, two microsatellite loci and dnaN and ptrpE genes of the bacterial endosymbiont Buchnera did not reveal genetic variation among worldwide collections of RWA. Only a single substitution was found in the pseudogene (ptrpE) in the Turkish populations. Amercian populations did not reveal a different genetic pattern compared to Ethiopian ones. The absence of genetic variation could be due to the recent and fast spread 0f the insect from its origin.
Download or read book Genetic Variation Within and Between Russian Wheat Aphid Diuraphis Noxia Kurdjumov Biotypes Found in the United States written by Tracey Lee Payton and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Russian Wheat Aphid Diuraphis Noxia Mord Damage on Kenyan Wheat Triticum Aestivum L Varieties and Possible Control Through Resistance Breeding written by Oliver K. Kiplagat and published by . This book was released on 2005* with total page 141 pages. Available in PDF, EPUB and Kindle. Book excerpt: . The Kenyan varieties were 91B33, Fahari, Kwale, Mbuni, Chiriku, Kongoni, Nyangumi and Mbega. Two RW A resistant wheats, Halt and PI 294994, were also tested against Kenyan isolates of the aphid. All the Kenyan varieties were susceptible to RW A when compared with the resistant line PI 294994. Halt, which is a resistant variety developed in the USA, was susceptible to Kenyan isolates of RW A. This indicates that the Kenyan RW A isolates are different from the USA ones. In seedlings, the RW A damage was expressed mainly as leaf chlorosis and leaf rolling, with damage scores increasing with time. Differences among the Kenyan varieties in the extent of leaf chlorosis were observed. The most devastating effect of RW A infestation of adult plants of the Kenyan varieties was the reduction in seed set. The tight rolling of flag leaves caused by the aphid delayed ear emergence, leading to floret sterility. Infestation also reduced the quality of the seeds produced, as shown by increased rate of seed deterioration under accelerated ageing conditions, and reduced seedling vigour. The effect of infestation on seed quality was more pronounced under dry conditions. Morphological and genetic variations within PI 294994 were identified. The PI 294994 plants tested could be separated into three distinct groups, all of which had equally high resistance to Kenyan RW A. One PI 294994 derived line, designated P3, was discovered to require no vernalization and therefore to be suitable for use in a Kenyan breeding programme. Segregation in the Fz populations indicated that resistance in two PI 294994 derived lines (PI and P2) was controlled by two genes (one dominant and one recessive). For P3, the results were inconclusive since in one Fz population the segregation indicated that the resistance was controlled by one dominant gene, whereas in another population the segregation indicated that resistance was due to one dominant and one recessive gene. Work to identify molecular markers linked to RW A resistance genees) in P3 was initiated.
Download or read book Molecular Mapping of Wheat Genes Expressing Resistance to the Russian Wheat Aphid Diuraphis Noxia Mordvilko Homoptera Aphididae written by Xuming Liu and published by . This book was released on 2001 with total page 332 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Russian wheat aphid research at CIMMYT Current status and future goals written by Burnett, P.A. and published by CIMMYT. This book was released on 1991 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Displacement of Russian Wheat Aphid Diuraphis Noxia Kurdjumov Biotype 1 in Colorado by Russian Wheat Aphid Biotypes Virulent to the Wheat Resistance Gene Dn4 written by Scott Curtis Merrill and published by . This book was released on 2009 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Displacement of Russian Wheat Aphid Diuraphis Noxia Kurdjumov Biotype 1 in Colorado by Russian Wheat Aphid Biotypes Virulent to the Wheat Resistance Gene Dn4 written by and published by . This book was released on 2009 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Identification and Characterization of Resistance to the Russian Wheat Aphid in Small grain Cereals written by Jonathan Robinson and published by CIMMYT. This book was released on 1994 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Sucking Pests of Crops written by Omkar and published by Springer Nature. This book was released on 2020-10-12 with total page 515 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sucking pests are most notorious group of pests for agricultural crops. Unlike most pests with chewing mouth parts, sucking pests cause more severe damage to the crops and are complex to get identified until advanced stages of infection. Not only is this late detection detrimental to their effective control, sucking pests also often cause fungal growth and virus transmission. The book emphasizes on sucking pests of most major crops of India. It aims to reflect Indian scenario before the international readership. This book complies comprehensive information on sucking pests of crops and brings the attention of the readers to this multiple damage causing insect complex. The chapters are contributed by highly experienced Indigenous experts from Universities & ICAR institutes, and book collates useful content for students and young researchers in plant pathology, entomology and agriculture.
Download or read book Plant Breeding Abstracts written by and published by . This book was released on 1999 with total page 1132 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Response Model for an Introduced Pest written by Sharron Sue Quisenberry and published by . This book was released on 1998 with total page 454 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Plant Breeding Reviews Volume 22 written by Jules Janick and published by John Wiley & Sons. This book was released on 2002-11-13 with total page 456 pages. Available in PDF, EPUB and Kindle. Book excerpt: Plant Breeding Reviews, Volume 22 presents state-of-the-art reviews on plant genetics and the breeding of all types of crops by both traditional means and molecular methods. The emphasis of the series is on methodology, a practical understanding of crop genetics, and applications to major crops.
Download or read book Wheat Special Report written by and published by . This book was released on 199? with total page 382 pages. Available in PDF, EPUB and Kindle. Book excerpt:
