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Cây ngô có các chiến lược khác nhau để bảo vệ hạt đang phát triển của chúng khỏi độc tính của cadmium
Tóm tắt
Nghiên cứu này nhằm xác định nồng độ của các axit amin hòa tan, ni tơ (N) và Cd trong các hạt ngô đang phát triển, được trồng trong đất ô nhiễm Cd từ giai đoạn gieo hạt đến các giai đoạn sinh sản. Các hoạt động cụ thể và tính chất ức chế phản hồi của các enzyme chuyển hóa lysine (Lys) cũng được xác định trong các hạt đang phát triển. Năng suất ngô tiềm năng đã bị suy giảm do sự tiếp xúc với Cd. Nồng độ cadmium trong các cơ quan cây trồng theo thứ tự giảm dần: rễ > thân = lá > hạt đang phát triển (37.04, 1.95, 1.46 và 0.22 mg kg−1 Cd, tương ứng). Nồng độ Cd tương đối thấp trong các hạt đang phát triển còn lại là kết quả của việc giảm sự chuyển vị Cd trong cây do rễ và bông tai. Các cây tiếp xúc với Cd có hạt đang phát triển với nồng độ N tăng (lên tới 7%) so với các cây kiểm soát. Hơn nữa, mức độ axit amin hòa tan (đặc biệt là histidine, glycine, tyrosine, methionine, isoleucine và valine) đã được tăng lên trong các hạt đang phát triển của các cây được xử lý Cd. Ngoài ra, những thay đổi trong tính chất phản hồi của dihydrodipicolinate synthase (DHDPS), một enzyme từ chuyển hóa lysine, đã được quan sát trong các hạt đang phát triển. Tóm lại, nghiên cứu hiện tại cho thấy rằng sự tiếp xúc của cây mẹ với Cd có thể làm thay đổi nồng độ của các axit amin hòa tan và hành vi của các enzyme chuyển hóa Lys trong các hạt đang phát triển. Nghiên cứu này không chỉ cung cấp thông tin mới về ảnh hưởng của việc tiếp xúc lâu dài với Cd trên cây, mà còn cung cấp dữ liệu về các chiến lược bảo vệ của cây chống lại độc tính của Cd.
Từ khóa
#cadmium #ngô #hạt đang phát triển #axit amin hòa tan #enzyme chuyển hóa lysineTài liệu tham khảo
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