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Sự hao hụt carbohydrate không cấu trúc của thân hỗ trợ việc giải phóng các nhánh bên khỏi kiểm soát ngọn trong cây con Quercus mongolica
Tóm tắt
Việc cắt tỉa lặp đi lặp lại đã làm thay đổi phân bố carbohydrate không cấu trúc ở các cơ quan khác nhau của cây con Quercus mongolica. Sự cạn kiệt carbohydrate không cấu trúc ở thân địa phương đã giải phóng các nhánh hoạt động khỏi kiểm soát ngọn. Các carbohydrate không cấu trúc (NSC) được tích trữ (tức là đường và tinh bột) trong cây đóng vai trò quan trọng trong trao đổi chất và sự phát triển, nhưng mối quan hệ của chúng với kiến trúc thực vật vẫn chưa được hiểu rõ. Sòi Mông Cổ (Quercus mongolica) là một loại gỗ quý có giá trị kinh tế quan trọng ở miền đông bắc Trung Quốc, nhưng thiếu kiểm soát ngọn trong giai đoạn cây con có thể làm giảm tiềm năng phát triển gỗ chất lượng. Trong nghiên cứu này, chúng tôi đã định lượng ảnh hưởng của việc cắt tỉa lặp lại (RP) lên hình thái, khối lượng sinh học và động lực học NSC trong cây con sòi Mông Cổ. Phương pháp RP đã thúc đẩy sự phát triển của chồi ngọn bằng cách làm tăng chiều dài của đợt đâm chồi thứ hai; tuy nhiên, sự phục hồi nhanh chóng của sự phát triển nhánh bên cho thấy khả năng kiểm soát ngọn không được cải thiện. Phương pháp RP đã thay đổi đáng kể mô hình phân bố dọc theo thân NSC trong các đơn vị tăng trưởng khác nhau (GUs) của thân, với trữ lượng NSC cao hơn ở các phần trên của thân được mong đợi sẽ nâng cao tiềm năng phát triển. Việc lưu trữ tổng hợp NSC của toàn bộ cây con, cùng với sự cạn kiệt tinh bột ở GU1 của thân, chỉ ra rằng cả trạng thái carbohydrate của toàn bộ cây con và chi phí địa phương của tinh bột là lý do để duy trì sự phát triển nhánh hoạt động. Việc định lượng sự biến đổi theo thời gian và không gian trong nồng độ đường và tinh bột ở các mô khác nhau đã cải thiện hiểu biết của chúng tôi về động lực học NSC trong sòi Mông Cổ, tiết lộ những mối quan hệ tiềm năng giữa trạng thái carbohydrate và sự thống trị ngọn ở cây.
Từ khóa
#Quercus mongolica #carbohydrate không cấu trúc #cắt tỉa lặp lại #sự phát triển của nhánh #động lực học NSCTài liệu tham khảo
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