Saad Diab Aldo
The present study investigated eight rice lines (Rupsal,
Nagalmutha, Polai, Ravana, Marishal, Talmugra, Kamini and
Raspanjar) collected from coastal region of eastern India for salinity
tolerance through phenotypic and genotypic screening. Among
these, three rice lines as highly tolerant (Talmugra, Marishal and
Kamini), three tolerant (Rupsal, Polai and Raspanjar) and two
moderately tolerant (Ravana and Nagalmutha) to salt stress were
identified in phenotypic screening. Pokkali was categorized as
tolerant under salinity condition (12 EC dS m-1). In PCR screening
using microsatellite (SSR) markers located within Saltol locus,
we documented new allelic pattern in selected highly tolerant and
tolerant genotypes with RM8094 marker as compared to Pokkali.
Besides, another marker RM10694 was found to associate with
selection of salinity tolerant genotypes similar to Pokkali. In gene
expression studies, no significant difference linked with abscisic
acid (ABA), calciumdependent proteins kinase (CDPK), ionic and
osmotic signaling pathways in salinity tolerant genotypes was
found as compared to sensitive line (IR29). Induction of AP37 gene
expression differentiated Kamini and Marishal genotypes from
other tolerant and sensitive lines.
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