Effect of  Salinity on germination of (Brassica rapa subsp. chinensis L.) through germination and early seedling growth indices

Nguyen Thi Dan Thi1,   , Tran The Khang2, Trinh Minh Nhut2, Pham Le Thao Vy2, Lam Quoc Nam2, Nguyen Nhat Nam2, Auguste Agustian1, Kasim Musliar1
1 Faculty Agriculture, Andalas Universitas, Padang, Indonesia
2 Agriculture and Aquaculture school, Tra Vinh Unviersity, Vietnam

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Tóm tắt

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.

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Tiểu sử các tác giả

Nguyen Thi Dan Thi, Faculty Agriculture, Andalas Universitas, Padang, Indonesia

Giảng viên, Khoa Nông nghiệp thuỷ sản, Đại học Trà Vinh, Viet Nam

Nghiên cứu sinh ngành Khoa học Nông nghiệp, Đại học Andalas, Indonesia

Tran The Khang, Agriculture and Aquaculture school, Tra Vinh Unviersity, Vietnam

Sinh viên địa học, Khoa Nông nghiệp Thuỷ sản, Đại học Trà Vinh, Việt Nam

Trinh Minh Nhut, Agriculture and Aquaculture school, Tra Vinh Unviersity, Vietnam

Sinh viên đại học, Khoa Nông nghiệp thuỷ sản, Đại học Trà Vinh

Pham Le Thao Vy, Agriculture and Aquaculture school, Tra Vinh Unviersity, Vietnam

Sinh viên đại học, Khoa Nông nghiệp Thuỷ sản, Đại học Trà Vinh

Lam Quoc Nam, Agriculture and Aquaculture school, Tra Vinh Unviersity, Vietnam

Giảng viên, Khoa Nông nghiệp Thuỷ sản, Đại học Trà Vinh

Nguyen Nhat Nam, Agriculture and Aquaculture school, Tra Vinh Unviersity, Vietnam

Phó giám đốc trung tâm ứng dụng sinh học, Khoa Nông nghiệp thuỷ sản, Đại học Trà Vinh

Auguste Agustian, Faculty Agriculture, Andalas Universitas, Padang, Indonesia

Giảng viên khao Nông nghiệp, Đại học Andalas, Indonesia.

Kasim Musliar, Faculty Agriculture, Andalas Universitas, Padang, Indonesia

2006-2011: Hiệu trưởng Đại học Andalas, Indonesia

2011 - 2014: Thứ trưởng Bộ Giáo dục và Văn hóa Indonesia, Lĩnh vực Giáo dục

2016 đến nay, Hiệu trưởng Đại học Baiturrahmah, Indonesia

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