Salicornia as a crop plant in temperate regions: selection of genetically characterized ecotypes and optimization of their cultivation conditions

Salicornia as a crop plant in temperate regions: selection of genetically characterized ecotypes and optimization of their cultivation conditions
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海蓬子作为温带作物:遗传特征生态型的选择及其栽培条件的优化

DOI:
10.1093/aobpla/plu071
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发表时间:
2014
期刊:
影响因子:
2.9
通讯作者:
Papenbrock
Papenbrock
中科院分区:
生物学3区
文献类型:
--
作者:
Buhmann;Flowers;Papenbrock

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全球气候变化导致的海平面上升和地下水盐碱化导致淡水资源迅速减少。因此,寻找种植粮食作物和蔬菜的替代品是很重要的。盐生植物是自然进化而来的耐盐植物,适应于生长在极大程度上抑制大多数糖类作物生长的环境中。盐角亚科植物因其对盐分的高度耐受性而成为盐碱地农业的潜在候选者。我们的目标是开发具有遗传特性的海蓬子和海蓬子品系,以供进一步育种和确定最佳栽培条件。为了获得一个庞大和多样化的基因库,从不同的国家和生态条件收集了种子。对62份海龙和肉鸡种质资源的外转录间隔区(ETS)序列进行了分析:ETS序列数据表明这两个属之间以及不同的海龙属之间存在明显的区别。然而,在某些情况下,ETS没有足够的可变性来解析形态上不同的物种。为了确定适宜的栽培条件,对不同材料的海蓬子进行了发芽、成苗和生长试验。实验结果表明,盐度较低、温度为20/10℃(昼夜)的种子萌发率最高。水培比沙培产生更多的可收获生物量,但由于水培植物表现出胁迫症状,营养浓度需要优化。分枝盐角草产生的可收获生物量比盐角草含有257 mM氯化钠的人工海水更多。在对其易培性、生物量增长、形态和口感等进行初步试验的基础上,对其进行了较为详细的研究,确定了其育苗的最适盐度为100 mm。正在收割OFS。在一个生长季节种植多年生草木是成功的,但需要优化收获之间的间隔,以最大限度地提高生物量产量。
Rising sea levels and salinization of groundwater due to global climate change result in fast-dwindling sources of freshwater. Therefore, it is important to find alternatives to grow food crops and vegetables. Halophytes are naturally evolved salt-tolerant plants that are adapted to grow in environments that inhibit the growth of most glycophytic crop plants substantially. Members of the Salicornioideae are promising candidates for saline agriculture due to their high tolerance to salinity. Our aim was to develop genetically characterized lines ofSalicorniaandSarcocorniafor further breeding and to determine optimal cultivation conditions. To obtain a large and diverse genetic pool, seeds were collected from different countries and ecological conditions. The external transcribed spacer (ETS) sequence of 62SalicorniaandSarcocorniaaccessions was analysed: ETS sequence data showed a clear distinction between the two genera and between differentSalicorniataxa. However, in some cases the ETS was not sufficiently variable to resolve morphologically distinct species. For the determination of optimal cultivation conditions, experiments on germination, seedling establishment and growth to a harvestable size were performed using different accessions ofSalicorniaspp. Experiments revealed that the percentage germination was greatest at lower salinities and with temperatures of 20/10 °C (day/night).Salicorniaspp. produced more harvestable biomass in hydroponic culture than in sand culture, but the nutrient concentration requires optimization as hydroponically grown plants showed symptoms of stress.Salicornia ramosissimaproduced more harvestable biomass thanSalicornia dolichostachyain artificial sea water containing 257 mM NaCl. Based on preliminary tests on ease of cultivation, gain in biomass, morphology and taste,S. dolichostachyawas investigated in more detail, and the optimal salinity for seedling establishment was found to be 100 mM. Harvesting ofS. dolichostachyatwice in a growing season was successful, but the interval between the harvests needs to be optimized to maximize biomass production.
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