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Ảnh hưởng của sự thích nghi ngoài in-vitro của Stevia rebaudiana (Bertoni) được xử lý bằng tác nhân gây kích thích đối với sinh khối tăng trưởng, đặc điểm sinh lý, tích lũy glycoside steviol và mẫu biểu hiện gen đường sinh tổng hợp
Journal of Plant Growth Regulation - Trang 1-14 - 2023
Tóm tắt
Stevia rebaudiana (Bertoni) là một loại thảo mộc quan trọng về mặt công nghiệp nhờ vào các hợp chất sinh hoạt có vị ngọt, đặc biệt là rebaudioside A và stevioside. Nhu cầu công nghiệp đối với các glycoside steviol chủ yếu được đáp ứng bằng các phương pháp nông nghiệp truyền thống, dẫn đến sự tích lũy không đồng nhất glycoside steviol (SGs) trong sản phẩm của S. rebaudiana, chủ yếu do những thay đổi trong điều kiện khí hậu khác nhau, kiểu gen và giống cây trồng. Do đó, cần có một quy trình mạnh mẽ để cung cấp vật liệu trồng chất lượng nhằm sản xuất S. rebaudiana giàu metabolite. Sự thích nghi ngoài in-vitro tại các khu vực tự nhiên được cho là phần quan trọng trong việc xác định số phận của các cây non được tái sinh thông qua phương pháp vi nhân. Trong cuộc điều tra hiện tại, các cây non được vi nhân đã được xử lý bằng tác nhân kích thích được cho thích nghi trong một tháng; sau đó, tỷ lệ sống sót, sự phát triển và sản lượng sinh khối lá, quang hợp diệp lục, phân tích sinh hóa của các metabolite chuyên biệt, và phân tích biểu hiện gen ứng cử viên được thực hiện. Một tỷ lệ cao (80–100%) cây đã thích nghi được thu được sau 30 ngày. Các cây được xử lý bằng polyethylene glycol (PEG) 1.5 mg L−1 đạt được chiều dài thân cao hơn (14.10 cm) và sinh khối lá tối đa (537.60 mg FW và 111.03 mg DW). Các thông số quang hợp diệp lục và hàm lượng sắc tố cho thấy hiệu suất quang hợp ổn định trong tất cả các điều kiện. Tối đa tổng SGs được tích lũy trong các cây được xử lý bằng PEG 1.5 mg L−1. Phân tích biểu hiện của các gen đường sinh tổng hợp SG cho thấy sự tương quan rõ ràng với hàm lượng metabolite. Nghiên cứu này tiết lộ rằng các cây được xử lý bằng PEG 1.5 mg L−1 thể hiện tốt hơn về sự phát triển, các thuộc tính năng suất và các thông số tích lũy metabolite sau một tháng thích nghi ngoài in-vitro.
Từ khóa
#Stevia rebaudiana #glycoside steviol #xử lý bằng tác nhân kích thích #sinh khối #biểu hiện genTài liệu tham khảo
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