English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Genetics of Karnal bunt (KB) resistance in wheat has earlier been investigated using heterogenous pathogen populations of Tilletia indica which has applied significance but does not provide clear cut genotypic resolution as in Puccinia-wheat systems. Therefore, an attempt was made for the first time to deploy genetically homogenous pathogen population for identifying loci involved in KB resistance. Recombinant inbred lines (RILs) derived from the cross, ALDAN 'S'/IAS 58 (KB resistant) and WH542 (susceptible cultivar) were screened with three inoculum types representing various levels of genetic heterogeneity:(i) mixture of 16 pathogen populations (from different agroclimatic regions representing high genetic heterogeneity), (ii) pathogen population from single geographic region (isolate P 4, Gurdaspur, Punjab, India representing heterogeneity within a single teliospore) and (iii) a pair of monosporidial lines of opposite mating types, derived from single teliospore of an isolate, P 4 (ge- netically homogenous culture). For genetic analysis, the RILs were grouped into three classes, using the parental scores for demarcating the categories. Using highly heterogenous inoculum, 2 additive genes (P = 0.947) and with comparatively less heterogenous inoculum system (isolate P 4 ) 3 genes (P = 0.557) for resistance were postulated. When inoculated with a homogenous pathogen population, the proportion of lines in the resistant category were greatly inflated in comparison to the categories obtained against P 4 isolate as well as mixture of isolates. How- ever, after merging resistant and moderately resistant categories, three genes could be postulated (P = 0.99). The additional gene that is observed against less heterogenous inoculum is probably getting knocked out by one or more of the 16 isolates which form a part of the most heterogenous inoculum system. It is inferred that for breed- ing high yielding KB resistant genotypes, genes effective against a wider spectrum of pathogen populations are of greater practical utility. To understand dynamics of host-pathogen interaction use of homogenous inoculum seems appropriate but it may pose sampling related problems of representing pathogen populations through monosporidial cultures as number of primary sporidia arising from a single teliospore are high and variation exists for pathogenecity alleles in different compatible pairs.

Genetics of Karnal bunt resistance: use of Tilletia indica populations at diﬀerent levels of heterogeneity