Các yếu tố phiên mã NAC CcNAC1 và CcNAC2 từ Citrullus colocynthis tham gia vào tín hiệu ánh sáng và auxin

Plant Cell Reports - Tập 33 - Trang 1673-1686 - 2014
Zhuoyu Wang1, Aaron M. Rashotte2, Fenny Dane1
1Department of Horticulture, Auburn University, Auburn, USA
2Department of Biological Sciences, Auburn University, Auburn, USA

Tóm tắt

Hai yếu tố phiên mã NAC mới từ Citrullus colocynthis được suy diễn liên quan đến con đường tín hiệu ánh sáng và auxin. Các yếu tố phiên mã NAC (NAM, ATAF1, 2, CUC2) có nhiều chức năng trong sự phát triển và tăng trưởng của cây trồng. Hai yếu tố NAC, CcNAC1 và CcNAC2, đã được xác định gần đây trong loài bầu bí có khả năng chịu hạn cực tốt, Citrullus colocynthis. Nghiên cứu này xem xét vai trò chức năng của các gen này dưới các loại ánh sáng khác nhau dựa trên phân tích in silico các promoter của CcNAC1 và CcNAC2 cho thấy sự hiện diện của nhiều motif liên quan đến ánh sáng. Tác động của ánh sáng và auxin đến biểu hiện của CcNAC1 và CcNAC2 được xem xét trên lá của C. colocynthis, và thông qua các dòng báo cáo (pCcNAC1, 2::GUS) trong Arabidopsis. Hơn nữa, tác động của việc biểu hiện quá mức liên tục (OE-CcNAC1, 2) trong Arabidopsis cũng được xem xét dưới nhiều điều kiện khác nhau để xác nhận mối liên kết giữa các dòng báo cáo. Các điều trị ánh sáng trắng, xanh, đỏ và đỏ xa đã mang lại các mô hình thay đổi định lượng tương tự trong biểu hiện của CcNAC1 và CcNAC2 ở cả hai loài, với sự gia tăng bản sao cao nhất theo sau ánh sáng đỏ. Những thay đổi quang hình (photomorphogenesis) trong giò cây Arabidopsis có liên quan đến mức độ bản sao của gene. Trong điều kiện không có ánh sáng, các giò cây của các dòng OE-CcNAC1/CcNAC2 dài hơn đáng kể so với WT. Việc bổ sung auxin ngoại sinh (+IAA) vào môi trường phát triển cũng dẫn đến sự thay đổi chiều dài giò cây của các dòng biểu hiện quá mức và các thay đổi không gian-thời gian của các dòng báo cáo trong cây con. Dữ liệu của chúng tôi gợi ý rằng CcNAC1, 2 có thể có vai trò chức năng quan trọng trong con đường tín hiệu ánh sáng, và có vẻ như liên quan đến hormone auxin. Đây là nghiên cứu đầu tiên chỉ ra rằng các gen NAC có thể đóng vai trò trong cả con đường tín hiệu ánh sáng và auxin.

Từ khóa

#CcNAC1 #CcNAC2 #NAC transcription factors #Citrullus colocynthis #light signaling #auxin signaling

Tài liệu tham khảo

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