MOLECULAR MARKER ANALYSIS OF SELECTED RICE LINES FOR AEROBIC TRAITS UNDER WATER LIMITED CONDITIONS TER LIMITED CONDITIONS

Abstract

In present scenario it is necessary to be a step ahead conferring with water scarcity. Aerobic rice is a newly
developed water efficient rice system which flourishes under unsaturated and non-flooded condition. High yield
in aerobic method of cultivation were ascribed to genotypes tolerance to moisture. In this context to assess the
influence of water use efficiency on grain yields in rice genotypes, field experiments were conducted. Segregating
aerobic x lowland progenies [MAS25/HKR47 (F3 & F4); MASARB25/HKR47 (F3
& F4
) and [MASARB25/HKR47)/
HKR47 (BC1F3)] were evaluated for various physio-morphological and/or root traits and SSR markers linked to the
traits promoting aerobic adaptation. In all the populations, enormous variation was observed for various physiomorphological and root traits. In these populations, significant positive correlation was observed between yield
per plant with plant height, effective number of tillers per plant, grain length/breadth ratio, 100 grain weight, root
length and/or root biomass. A total of 40 SSR markers linked to the QTL promoting aerobic adaptation (as found
by others) were used for the parental screening. Presence of these traits was ascertained using single marker
analysis. A total of 3-7 polymorphic microsatellite markers linked to the traits promoting aerobic adaptation were
used to analyze the segregation in the selected F4 and BC1F3 plants derived from the five crosses. In SSR marker
analysis most of the selected plants were found to posses desirable alleles for the markers reported earlier to be
linked with the aerobic adaptation traits.