Seedling emergence in winter and spring canola genotypes under salinity stress

• DOI: 10.1002/csc2.70011
• Publication Date: 2025-03-11T21:22:56Z
• Authors: Rajan Shrestha; Qingwu Xue; Andrea Leiva Soto; Girisha Ganjegunte; Santosh Subhash P...; V. N. Chaganti; S. Kumar; A. L. Ulery; R. P. Flynn; S. Zapata

Abstract In the worldwide context of rising salinity issues in agriculture, it is important to understand crop responses stress. Currently, standing as second largest oilseed crop, canola ( Brassica napus L.) entices continued research focus on such aspects. Thus, this study investigated genotypic variation seedling emergence characters under Two growth chamber experiments were conducted diverse genotypes (10 each winter and spring types) at six levels (0, 2, 4, 6, 8, 10 dS m −1 EC). Increasing reduced indices (emergence percentage, rate index, corrected velocity) salt tolerance index (STI). An approximate threshold range 6–8 ECs was determined. Importantly, ≥8 EC substantially delayed by 3–7 days after seeding. Winter CP1022WC/Chinook CP320WRR, Monarch, PI597352, PI601200, PI432395 had higher STI indices. Based cluster analysis, genotype groups classified low (Athena, CP115W, Durola, Impress, Gem), medium (Amanda, Ericka, Salut, CP225WRR, Clearwater, Wester), high salt‐tolerant types (CP1022WC/Chinook, PI432395). All showed broad‐sense heritability H 2 = 0.82–0.94). Between types, consistently greater genetic potential for than canola. The results provided useful information establishment further improvement tolerance.