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Phân lập chi tiết và tích hợp đồng vị gen sdw3 ở lúa mạch
Tóm tắt
Alen đột biến sdw3 ở lúa mạch mang lại kiểu hình lùn bán nhạy với gibberellin, có tiềm năng cho việc lai tạo các giống lúa mạch lùn mới. Hướng tới việc phân lập dựa vào bản đồ gen, sdw3 được xác định trong vùng 0.04 cM tại một "điểm lạnh" tái tổ hợp của vùng gần đầu ngắn của nhiễm sắc thể 2H. Sự tương đồng rộng rãi giữa vị trí Sdw3 của lúa mạch (Hvu_sdw3) và các vùng tương đồng (Osa_sdw3, Sbi_sdw3, Bsy_sdw3) của ba loài cỏ khác (Oryza sativa, Sorghum bicolor, Brachypodium sylvaticum) cho phép chúng tôi tiến hành bão hòa dấu hiệu hiệu quả trong khoảng mục tiêu. Phân tích trình tự so sánh đã phát hiện sự đồng tuyến cho 23 trong số 38, 35 và 29 gen được xác định trong Brachypodium, lúa và Sorghum, tương ứng. Các dấu hiệu đồng phân lập với Hvu_sdw3 đã được tạo ra từ hai trong số những gen này. Những nỗ lực ban đầu trong việc đi bộ trên nhiễm sắc thể ở lúa mạch đã được thực hiện với bảy trình tự gen đối hom ở mức vật lý lần lượt là 223, 123 và 127 kb trong Brachypodium, lúa và Sorghum. Sáu đoạn BAC (biến thể DNA nhân tạo của vi khuẩn) không chồng chéo nhỏ có tổng chiều dài 670 kb đã được thu nhận, cho thấy kích thước vật lý của Hvu_sdw3 lớn hơn đáng kể. Phân đoạn có chọn lọc BAC từ các đoạn lúa mạch này cho thấy tần suất gen trên mỗi khoảng cách vật lý thấp hơn đáng kể và sự hiện diện của các gen không đồng tuyến bổ sung. Bốn gen ứng viên cho sdw3 đã được xác định trong các trình tự BAC của lúa mạch, mà hoặc đồng phân lập với gen sdw3 hoặc nằm cạnh các gen đồng phân lập này. Việc xác định các trình tự gen trong ngữ cảnh sdw3 cung cấp công cụ cho việc chọn lọc bằng dấu hiệu hỗ trợ. Việc xác định cuối cùng gen thực sự sẽ góp phần cung cấp thông tin mới cho sự hiểu biết cơ bản về các cơ chế điều tiết sự phát triển ở lúa mạch.
Từ khóa
#lúa mạch #gen lùn sdw3 #phân lập gen #lai tạo giống #dấu hiệu hỗ trợ #tương đồng di truyềnTài liệu tham khảo
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