Nội dung được dịch bởi AI, chỉ mang tính chất tham khảo
Phân tích di truyền khả năng chịu hạn và tiềm năng phục hồi thông qua lập bản đồ vị trí tính trạng định lượng của một quần thể khoai tây lưỡng bội
Tóm tắt
Khoai tây là loại cây lương thực quan trọng thứ ba về mức tiêu thụ, tuy nhiên, nó khá nhạy cảm và dễ bị ảnh hưởng bởi sự mất mùa do hạn hán. Bước đầu tiên để cải thiện khả năng chịu hạn ở loại cây này, chúng tôi đã thực hiện việc xác định cơ sở di truyền cho khả năng chịu hạn trong một quần thể khoai tây lưỡng bội. Các thí nghiệm được tiến hành trong điều kiện nhà kính trong hai năm liên tiếp bằng cách ghi nhận bốn thông số sinh lý, bảy thông số sinh trưởng và ba thông số năng suất dưới các biện pháp stress và phục hồi. Các kiểu gen cho thấy sự biến đổi đáng kể về phản ứng với hạn hán và sự phục hồi. Các đặc điểm đo được có độ kế thừa thấp đến vừa phải (từ 22 đến 74%). Tổng cộng có 47 vị trí tính trạng định lượng (QTL) đã được xác định, trong đó có 28 vị trí đặc hiệu cho hạn, 17 vị trí dưới điều trị phục hồi và hai vị trí trong điều kiện tưới đủ nước. Phần lớn các QTL ảnh hưởng đến sinh trưởng và năng suất này nằm gần vị trí QTL cho độ chín trên nhiễm sắc thể 5. Bốn QTL cho δ13C, ba cho hàm lượng diệp lục và một cho độ phát quang diệp lục (F
v/F
m) được phát hiện có sự đồng vị trí với các QTL năng suất và các đặc điểm sinh trưởng khác được xác định trên các nhiễm sắc thể khác. Nhiều QTL được phát hiện trong nhiều năm và nhiều biện pháp điều trị, và tương tác QTL × môi trường được ghi nhận cho δ13C. Theo hiểu biết của chúng tôi, đây là nghiên cứu QTL toàn diện đầu tiên về tình trạng thiếu nước và tiềm năng phục hồi ở khoai tây.
Từ khóa
#khả năng chịu hạn #khoai tây #lập bản đồ QTL #sinh trưởng #năng suất #di truyềnTài liệu tham khảo
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