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首页> 外文期刊>Plant Physiology and Biochemistry >Biochemical and anatomical responses related to the invitro survival of the tropical bromeliad Nidularium minutum to low temperatures
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Biochemical and anatomical responses related to the invitro survival of the tropical bromeliad Nidularium minutum to low temperatures

机译：与热带凤梨Nidularium minutum到低温的体外存活相关的生化和解剖反应

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摘要

Nidularium minutum is a tropical bromeliad that grows in natural environment with temperatures ranging from 2 to 30°C. In the present work we cultivated this species invitro at 5, 10, 15, and 25°C for 3 and 6 months aiming at assessing biochemical and morphological responses that allow its survival under low temperatures. No survival was observed for plants cultured constantly at 5°C and the lowest biometric parameters were found for those grown at 10°C. A thick aquiferous parenchyma, accumulation of reducing sugars, and increased pectin content in the cell walls were observed in plants grown at 10 and 15°C when compared to those maintained at 25°C. In plants cultured at 10°C, leaf bleaching correlated with low chlorophyll content and lower survival rate after 6 months when compared to those grown at 15°C. The best invitro culture condition for slow growth and plant acclimatization was found to be at 15°C. This probably correlated with the immediate availability of carbon to restore growth during acclimatization and also with higher root initiation under this condition. This study brings information about the responses related to functional adaptation to low temperatures in N.minutum cultured invitro that can also be implicated in its survival under natural conditions. Additionally, it suggests the best temperature to form a minimal growth collection to be used in restocking and conservation programs for endangered tropical bromeliads.
机译：Mindiumium minutum是一种热带凤梨科植物，在自然环境中生长，温度范围为2至30°C。在目前的工作中，我们在5、10、15和25°C下进行了3到6个月的体外培养，目的是评估能够在低温下存活的生物化学和形态学响应。对于在5°C下持续培养的植物，未观察到存活，对于在10°C下生长的植物，生物特征参数最低。与保持在25°C的植物相比，在10和15°C的植物中观察到了厚的含水薄壁组织，还原糖的积累以及细胞壁中果胶含量的增加。与在15°C下生长的植物相比，在10°C下培养的植物中，叶漂白与叶绿素含量低和6个月后的较低存活率相关。发现缓慢生长和植物适应的最佳体外培养条件是15℃。这可能与碳在适应过程中立即恢复生长所需的碳以及在这种条件下更高的根萌生率有关。这项研究带来了有关在体外培养的猪笼草中低温适应功能相关反应的信息，这也可能与其在自然条件下的存活有关。此外，它提出了形成最低限度生长集合的最佳温度，可用于濒危热带凤梨科动物的补养和保护计划。

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