Effect of Salinity on germination of Pak Choi (Brassica rapa subsp. chinensis L.) through germination and early seedling growth indices
Main Article Content
Abstract
Salinity acts as a key abiotic stress that hampers seed germination and early seedling growth. This study examined how salinity affects germination and initial development in Pak Choi (Brassica rapa subsp. chinensis L.) at electrical conductivity (EC) levels from 0 up to 16 dS m⁻¹. We measured parameters like germination percentage (GP), germination index (GI), mean germination time (MGT), T₅₀, seedling vigor index (SVI), shoot and root lengths, fresh and dry biomass, plus dry weight-to-length ratios. At mild salinity (EC ≤ 4 dS m⁻¹), GP stayed high at 91.8%, and seedlings actually developed better - with fresh weight achieving a maximum of 51.30 mg at EC 4 dS m⁻¹ (almost twice the control's 22.88 mg) and SVI-shoot topping surpassing 250—suggesting a favorable response to low-level salt stress. Germination time-related indices increased progressively with EC, with T₅₀ rising from 12.38 h at EC 0 to 27.02 h at EC 16 dS m⁻¹. Seedling growth and vigor declined sharply at EC 10 dS m⁻¹, growth and vigor dropped off quickly: shoot length fell from 3.2 cm to just 0.72 cm at EC 16 dS m⁻¹. Shoots suffered more than roots, and higher salinity boosted dry weight-to-length ratios (from 0.60 to 1.51 mg cm⁻¹), pointing to a change toward denser biomass rather than longer growth. Thus, these findings provide quantitative salinity thresholds for Pak choi at the germination and early seedling stage, offering practical references for agronomic management in saline-affected areas and a basis for selecting salt-tolerant genotypes within the Brassicaceae family.
Keywords
Germination, Growth and development, Pak choi, Salt stress
Article Details

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References
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