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Ecophysiology of two endemic Amazon quillworts
Aquatic Botany ( IF 1.8 ) Pub Date : 2020-12-31 , DOI: 10.1016/j.aquabot.2020.103350
Daniel Basílio Zandonadi , Heitor Monteiro Duarte , Mirella Pupo Santos , Luis Alfredo dos Santos Prado , Rodrigo Lemes Martins , Emiliano Nicolas Calderon , Ana Carolina Almeida Fernandes , Quézia Souza Santos , Filipe Junior Gonçalves Nunes , Luiz Carlos Felisberto Ribeiro , Taís Nogueira Fernandes , Alexandre Castilho , Francisco de Assis Esteves

Isoetes L. is a genus of lycophytes widely distributed around the world, with many endemic species. In our work we document the first successful large scale ex situ cultivation of the threatened species from Brazilian Amazon Isoetes cangae and Isoetes serracarajensis, which are endemic of a lake and close ponds nearby, respectively. This study aimed to develop the ex situ cultivation methods of the species I. cangae and I. serracarajensis. The capacity of regrowth and to tolerate high soluble iron in the water was monitored. We also studied plant leaf nutrition, growth, photosynthesis, and plasma membrane H+-ATPase activity. Both species were cultivated in a low-cost system at a greenhouse during three seasons through a year. The survival rate of plants was higher as 98%, and both species developed effectively on the culture system with different patterns during linear growth: I. cangae showed faster leaf growth but was slower on new leaves production compared to I. serracarajensis. The mechanism of leaf expansion seems to be related to H+-ATPase activation, near to 2-fold higher in I. cangae. Contrarily, the effective quantum yield of photosystem II was higher in I. serracarajensis than in I. cangae. Both species accumulate very high concentration of minerals in the leaf tissue, and I. serracarajensis presented more iron than I. cangae, and remarkably showed more new leaves on higher iron concentration exposure. I. cangae showed the ability to reproduce during ex situ cultivation. The results of this work have broad applicability, assisting other low-cost cultivation studies, which are critical to ecosystem recovery of mining areas and conservation strategies.



中文翻译:

两种地方性亚马逊草的生态生理学

Isoetes L.是苔藓植物的一种,广泛分布于世界各地,有许多特有物种。在我们的工作中,我们记录了巴西亚马逊Isoetes cangaeIsoetes serracarajensis的濒危物种的首次成功大规模异地栽培它们分别是湖泊和附近池塘的特有种。本研究旨在开发易地物种的栽培方法一cangae。serracarajensis。监测再生能力和耐受水中高铁的能力。我们还研究了植物叶片的营养,生长,光合作用和质膜H +-ATP酶活性。在一年中的三个季节中,这两个物种都在低成本系统中的温室中栽培。植物的成活率较高为98%,而这两个物种具有不同图案的培养体系上的线性增长过程中有效发展:一,cangae呈现较快茎叶生长但相比于新叶生产慢一个serracarajensis。叶片扩张的机制似乎与H + -ATPase活化有关,在I. cangae中高出近2倍。相反,光系统II的有效量子收率为较高的I. serracarajensisI. cangae。两种物种在叶片组织中积累的矿物质浓度很高,并且锯齿状山雀的铁含量高于海藻,并且在铁浓度较高的情况下,叶片中显示出更多的新叶片。I. cangae异地栽培中显示出繁殖能力。这项工作的结果具有广泛的适用性,有助于其他低成本的耕种研究,这对于采矿区的生态系统恢复和保护战略至关重要。

更新日期:2021-01-06
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