Tarbiat Modares University Journal of Agricultural Science and Technology 1680-7073 24 1 2022 01 01 Differential Accumulation Patterns of Seed Proteins in Salt-Tolerant and Salt-Sensitive Rice Lines under Varying Salinity Levels الگوی انباشت افتراقی پروتئین دانه در لاین های برنج متحمل و حساس به شوری در سطوح مختلف شوری 139 153 16622 EN A. Singh Department of Botany, Akal University Talwandi Sabo (Bathinda), Punjab, India. B. Arora Department of Botany, Akal University Talwandi Sabo (Bathinda), Punjab, India. N. K. Matta Department of Botany, Kurukshetra University, Kurukshetra, Haryana, India. Journal Article Salt-induced changes in the accumulation pattern of seed proteins were studied in salt-sensitive (MI-48) and tolerant (CSR-10) rice lines. An increase in seed protein content was observed with progress in seed development from 4 to 12 Days After Flowering (DAF) and up to maturity at each salinity level (4, 7, and 10 dS m^-1). However, a 10-21, and 14-30% reduction in seed protein was noted when compared at a given developmental stage at all the salinity levels in ‘CSR-10’ and ‘MI-48,’ respectively. Among the four seed protein fractions, the proportion of glutelins revealed an increase (5-9%) in mature seeds of ‘CSR-10’ with a decrease (11-13%) in ‘MI-48’ under increasing salinity levels. Prolamins exhibited a reverse trend in both lines. Albumins and globulins revealed a decreased proportion in 'CSR-10' but an increase in 'MI-48' only at 10 dS m^-1 at a given developmental stage. In ‘CSR-10’, the accumulation pattern of the glutelin [Molecular weight (<em>Mr</em>.) 36-40.5 and 19-21.5 kDa] and prolamin (13 kDa) polypeptides was seen similar at the control, 4, and 7 dS m^-1 except for the higher concentration of these at later two. At 10 dSm^-1, a contradictory pattern of accumulation of these polypeptides was observed. In ‘MI-48’, a completely different trend (earlier and faster accumulation) of the above-mentioned polypeptides was seen at 4 and 7 dS m^-1 in comparison to the control from early stages. Prolamin polypeptide (13 kDa) showed a continuous decrease in its concentration at all the salinity levels; more pronounced at 10 dSm^-1. Therefore, both lines revealed a different mechanism in response to a given salinity condition. https://jast.modares.ac.ir/article_16622_dae43844e99e2120bb9f2e00b05d7ca3.pdf