College of Agriculture and Forestry Sciences, Linyi University, Linyi, 276005, China.
Key Laboratory of Eco-Environment in the Three Gorges Reservoir Region (Ministry of Education), School of Life Sciences, Southwest University, Chongqing, 400715, China.
Sci Rep. 2017 Oct 24;7(1):13885. doi: 10.1038/s41598-017-13467-0.
One-year old seedlings of Salix variegata (submergence-tolerant) and Cinnamomum camphora (submergence-intolerant) were selected and subjected to complete submergence (2 m) for 1, 5, 10, and 20 days, to elucidate the submergence- tolerance mechanism of S. variegata in the Three Gorges reservoir region. The basal CO emission ratios (BCERs) and O consumption rates (OCRs) of leaf, stem, and root were determined. The basal O consumption rates (BOCRs) were calculated from the OCRs of different parts and their biomass allocations and used for evaluating the basal metabolic rate (BMR) of species with BCERs. The results showed that: (1) The BCERs of both species responded to flooding similarly, and no significant differences occurred between the submerged S. variegata (SS) and the submerged C. camphora (SC) seedlings, and between the control S. variegata (CS) and the control C. camphora (CC) seedlings. (2) The BOCRs of SS were significantly lower than those of SC on days 1 and 20, while no significant differences occurred between CS and CC for every duration. Therefore, the BMRs, evaluated from BOCRs rather than from BCERs, were related to submergence-tolerance of species, and the response of BMR to submergence would contribute to the survival of S. variegata seedlings under flooding.
选择 1 年生的杂种柳（耐淹）和樟树（不耐淹）幼苗，进行完全淹没（2m）处理 1、5、10 和 20 天，以阐明三峡库区杂种柳的耐淹机制。测定叶片、茎和根的基础 CO 排放比（BCER）和 O 消耗率（OCR）。从不同部位的 OCR 和它们的生物量分配计算基础 O 消耗率（BOCR），并用于评估具有 BCER 的物种的基础代谢率（BMR）。结果表明：（1）两种物种的 BCER 对洪水的响应相似，淹没的杂种柳（SS）和淹没的樟树（SC）幼苗之间，以及对照的杂种柳（CS）和对照的樟树（CC）幼苗之间均无显著差异。（2）SS 的 BOCR 在第 1 天和第 20 天显著低于 SC，但 CS 和 CC 在每个时间段均无显著差异。因此，从 BOCR 而不是从 BCER 评估的 BMR 与物种的耐淹性有关，BMR 对淹没的响应有助于杂种柳幼苗在洪水下的生存。
