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Quang hợp của hai lớp địa y rêu từ sa mạc Tengger với độ nhạy khác nhau đối với bức xạ UV-B bổ sung
Tóm tắt
Dự đoán những tác động của bức xạ cực tím-B (UV-B) tăng cao do sự suy giảm tầng ozon đối với hệ sinh thái sa mạc ôn đới đòi hỏi phải có kiến thức tốt hơn về phản ứng sinh thái sinh lý của các loài rêu phổ biến. Mục tiêu của công trình hiện tại là xác định liệu bức xạ UV-B gia tăng có ảnh hưởng đến hiệu suất quang hợp và cấu trúc siêu vi của hai lớp địa y rêu hay không và liệu có sự khác biệt trong phản ứng giữa các lớp hay không. Trong các thí nghiệm trong phòng thí nghiệm, Bryum argenteum và Didymodon vinealis, thể hiện sự phân bố vi mô và chiếm ưu thế trong các lớp đất ở sa mạc Tengger, miền Bắc Trung Quốc, đã được tiếp xúc với bốn mức độ bức xạ UV-B là 2.75 (kiểm soát), 3.08, 3.25 và 3.41 W m−2 trong 10 ngày, mô phỏng 0, 6, 9, và 12% tầng ozon stratospheric tại vĩ độ Shapotou, tương ứng. Kết quả cho thấy rằng các thông số huỳnh quang chlorophyll a (tức là, năng suất lượng tử tối đa của quá trình quang hóa PSII, năng suất lượng tử hiệu quả của quá trình quang hóa PSII, và hệ số bội thu quang hóa) , nội dung sắc tố, nội dung protein hòa tan, và cấu trúc siêu vi bị ảnh hưởng tiêu cực bởi bức xạ UV-B tăng cao và mức độ tác động có hại tăng rõ rệt với cường độ bức xạ UV-B. Hơn nữa, các kết quả chỉ ra rằng B. argenteum có thể nhạy cảm hơn với bức xạ UV-B bổ sung so với D. vinealis. Do đó, chúng tôi đề xuất việc sử dụng các lớp địa y B. argenteum như một chỉ số sinh học phản ánh sự đáp ứng đối với bức xạ UV-B tăng cao.
Từ khóa
#bức xạ UV-B #rêu #hiệu suất quang hợp #cấu trúc siêu vi #chỉ số sinh họcTài liệu tham khảo
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