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首页> 外文期刊>Current Science: A Fortnightly Journal of Research >Combined effect of PGRs and soil facilitate early flowering of an endangered alpine orchid Dactylorhiza hatagirea at lower elevation
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Combined effect of PGRs and soil facilitate early flowering of an endangered alpine orchid Dactylorhiza hatagirea at lower elevation

机译：PGR和土壤的共同作用促进了濒临灭绝的高山兰花Dactylorhiza hatagirea在较低海拔的早期开花

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Formation of aerial parts, inflorescence or flowers are important adaptive features of alpine plants, making them successful in alpine environment. This is considered as an ubiquitous arctic–alpine adaptation that has evolved independently in all arctic and alpine areas of the world, including the Himalayas. The alpine flora is mainly composed of herbaceous perennials and prostrate shrubs which are well adapted, successful, autochthonous elements of high altitudes1. Flower induction in plants is controlled by primary and secondary environmental factors such as photoperiod, temperature, irradiance and water availability. These environmental factors can promote the synthesis of a floral stimulus that is transported through vascular tissues to the shoot apical meristem and subsequently induce flower initiation2. Formation of aerial parts, inflorescence or flowers of plants are habitat specific, depends on various microclimatic conditions including altitude and it was difficult to obtain these plant developmental stages at lower elevation due to change in climatic conditions and habitat. However, it is now possible to obtain early sprouting and floral formation of an endangered high altitude medicinal orchid Dactylorhiza hatagirea (D. Don) Soo at lower elevation using plant growth regulators (PGRs). Besides, it would also reduce the time for collection of explants required for in vitro culture establishment. Early sprouting and flowering at lower elevation provides explants much earlier than at higher elevation.
机译：空中部分，花序或花朵的形成是高山植物的重要适应特征，使其在高山环境中获得成功。这被认为是普遍存在的北极-高山适应，已在包括喜马拉雅山在内的世界所有北极和高山地区独立发展。高山植物区系主要由多年生草本植物和strate灌木组成，它们是高海拔地区适应性强，成功的土生植物元素1。植物的花诱导受主要和次要环境因素控制，例如光周期，温度，辐照度和水利用率。这些环境因素可以促进花香刺激物的合成，该花香刺激物通过血管组织转运到茎尖分生组织，随后诱导花的萌生2。植物的空中部分，花序或花的形成是特定于栖息地的，取决于各种微气候条件，包括海拔高度，由于气候条件和栖息地的变化，很难在较低海拔获得这些植物发育阶段。但是，现在可以使用植物生长调节剂（PGR）在较低的高度上获得濒危高海拔药用兰花Dactylorhiza hatagirea（D. Don）Soo的早期发芽和花的形成。此外，这还将减少收集建立体外培养所需的外植体的时间。较低高度的早期发芽和开花比高度较高的提供更早的外植体。

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