Answered: Drought is one of the major problems…

Human Anatomy & Physiology (11th Edition)

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

Section: Chapter Questions

Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

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Drought is one of the major problems which cause serious yield reduction in wheat crop. How QTL mapping could help to improve the yield related attributes in wheat. Explain the best morphological, biochemical and molecular markers and mechanism involved in QTL breeding

Expert Solution

Step 1

The Quantitative trait loci (QTL) is a location from where some genes influence a phenotype of quantitatively inherited trait.
Genetic variations of a crop can be explored through QTL mapping.
Mapping of QTL allows the estimation of the places, quantity, size of effects for the phenotype, and gene activity pattern.
In wheat, due to drought stress, the place of genes which had influence on ABA concentration was detected .It is detected that 5A chromosome transports gene(s) for ABA concentration.
Double haploid populations is permanent source of QTL mappings. Recombinant inbred lines from crossing of drought-resistant and drought-susceptible cultivars were used to create mapping populations for QTL analysis regulating yield under drought .
QTL analysis is important to target genes and for doing this : Firstly, phenotypic evaluation of relatively large population for markers which are polymorphic is needed. Secondly, genotyping of the population is important. Thirdly, there is a need for statistical analysis to detect the loci that are influencing the target trait.
QTL analysis is proper method which have been done for qualitative and quantitative characteristics including resistance for stress.