A genetic study of host : parasite relationship involving Hordeum vulgare and Ustilago hordei
department or school: Science, Faculty of
department or school: Botany, Department of
data provider: DSpace
degree campus: UBCV
creator: Sidhu, Gurmel Singh
issued: 2011-03-24T17:33:43Z
issued: 1972
related degree: Doctor of Philosophy - PhD
degree grantor: University of British Columbia
description: The present study was undertaken to learn whether the kind of host-parasite relationships described by H. H. Flor also exist in Hordeum vulgare:Ustilago hordei system. This system provides additional advantages of genetic analysis over most other known parasitic systems, therefore was more suitable for this type of study. Moreover, a complete genetic analysis of a parasitic system involving a smut fungus has never been attempted before, making the system all the more important. To understand gene-for-gene relationships it becomes of fundamental importance to elucidate the genetics of one member of a parasitic system in order to exploit the genetics of the other. This can be efficiently achieved if the genetic purity of interacting members of a parasitic system is ascertained. In cases where sexual reproduction regularly occurs (such as in heterothallic smuts) a greater magnitude of genetic variability is expected as compared to asexually reproducing fungi or fungi with homothallic mating systems. Since one member of the parasitic system with which the present study deals is a heterothallic smut fungus (Ustilago hordei) the study was initiated by establishing which specific virulence genes were borne by the test cultures. The host, barley (Hordeum vulgare), is naturally inbreeding thus creating no serious problem of variability. Two recessive genes for virulence (Uhv₁ and Uhv₂) were discovered in the two test cultures of U. hordei through backcross method. (The back-cross method is more useful than the F₂ ratios obtainable from a tetrad). The culture having virulence gene Uhv₁ was derived from teliospore E through selfing and was effective on both the varieties Hannchen and Vantage. The second culture, possessing virulence gene Uhv₂, however, originated from teliospore D through selfing and was effective on variety Excelsior. Thus the genotype of the two test cultures possessing virulence genes Uhv₁ and Uhv₂ become Uhv₁Uhv₁UhV₂UhV₂ and UhV₁UhV₁Uhv₂Uhv₂ respectively. …
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/32869
note: A GENETIC STUDY OF HOST:PARASITE RELATIONSHIP INVOLVING HORDEUM VULGARE AND USTILAGO HORDEI by GURMEL S. SIDHU B.Sc. Punjab University, India M.Sc. Punjab University, India A THESIS SUBMITTED IN PARTIAL FULFILMENT OF THE REQUIREMENT FOR THE DEGREE OF DOCTOR OF PHILOSOPHY i n the Department of Botany We accept t h i s thesis as conforming to the required standard The U n i v e r s i t y of B r i t i s h Columbia A p r i l , 1972. In p r e s e n t i n g t h i s t h e s i s in p a r t i a l f u l f i l m e n t o f the requirements f o r an advanced degree at the U n i v e r s i t y of B r i t i s h Columbia, I agree that the L i b r a r y s h a l l make i t f r e e l y a v a i l a b l e f o r re ference and s tudy . I f u r t h e r agree t h a t permiss ion fo r e x t e n s i v e copying o f t h i s t h e s i s f o r s c h o l a r l y purposes may be granted by the Head of my Department or by h i s r e p r e s e n t a t i v e s . It i s understood that copy ing o r p u b l i c a t i o n of t h i s t h e s i s f o r f i n a n c i a l ga in s h a l l not be a l lowed wi thout my w r i t t e n p e r m i s s i o n . Depa rtment The U n i v e r s i t y o f B r i t i s h Columbia Vancouver 8, Canada Date i i ct ABSTRACT The present study was undertaken to learn whether the kind of host-parasite r e l a t i o n s h i p s described by H. H. F l o r also e x i s t i n Hordeum vulgare:Ustilago hordei system. This system provides a d d i t i o n a l advantages of genetic analysis over most other known p a r a s i t i c systems, therefore was more suitable f o r t h i s type of study. Moreover, a complete genetic analysis of a p a r a s i t i c system i n v o l v i n g a smut fungus has never been attempted before, making the system a l l the more important. To understand gene-for-gene r e l a t i o n s h i p s i t becomes of funda-mental importance to elucidate the genetics of one member of a p a r a s i t i c system i n order to e x p l o i t the genetics of the other. This can …
has type: Thesis/Dissertation
is shown at: 10.14288/1.0101409
language: eng
degree discipline: Botany
provider: Vancouver : University of British Columbia Library
publisher: University of British Columbia
rights: For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
scholar level: Graduate
type: Text
identifier URI: http://hdl.handle.net/2429/32869