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首页> 外文期刊>Plant and Soil >The effect of soil moisture on the tolerance of Lupinus pilosus genotypes to a calcareous soil.
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The effect of soil moisture on the tolerance of Lupinus pilosus genotypes to a calcareous soil.

机译：土壤水分对羽扇豆基因型对钙质土壤的耐受性的影响。

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Commercial narrow-leafed lupins (Lupinus angustifolius) grown on calcareous soils commonly display chlorotic symptoms resembling Fe deficiency. The severity of chlorosis increases with concurrent increases in soil moisture content. Research indicated that the rough-seeded lupin species, L. pilosus has a range of adaptation to calcareous soils, from tolerant to intolerant. A pot experiment was conducted comparing a tolerant, a moderately tolerant and a moderately intolerant genotype of L. pilosus. Plants were grown for 35 days in a calcareous soil (50% CaCO3) at three moisture contents (80%, 100% and 120% of field capacity); the growth was compared with that on a fertile black cracking clay control soil at 70% of field capacity. Visual chlorosis score, chlorophyll meter readings, number of leaves and shoot dry weights were recorded at 14, 21, 28 and 35 days after sowing. Concentrations of chlorophyll, active Fe and nutrients in the youngest fully expanded leaves were also measured. Results showedthat increased soil moisture increased the severity of chlorotic symptoms (increased chlorosis score) in all genotypes. The tolerant genotype showed significantly less symptoms than other genotypes at all moisture contents. All genotypes were able to recover from chlorosis symptoms at 80% moisture in the calcareous soil. Chlorosis score negatively correlated with chlorophyll meter readings, chlorophyll concentration and foliar active and total Fe, and Mn concentrations. Visual chlorosis score appeared to be a cost effective, accurate and efficient method enabling classification of the tolerance of genotypes. The chlorotic symptoms were likely to be due to HCO3- induced nutrient deficiencies or a direct effect of HCO3- on chlorophyll synthesis. This study indicates that the most probable mechanism of tolerance is related to an ability to prevent uptake of HCO3- or efficiently sequester it once inside the root which prevents increases in internal pH and transport to the shoots.
机译：在钙质土壤上生长的商品窄叶羽扇豆（羽扇豆羽扇豆）通常表现出类似于铁缺乏的褪绿症状。绿化的严重程度随着土壤含水量的同时增加而增加。研究表明，羽扇豆羽扇豆种L. pilosus对钙质土壤具有一定的适应性，从耐性到不耐性。进行盆栽试验，比较了毛状乳杆菌的耐受性，中度耐受性和中度耐受性基因型。使植物在钙质土壤（50％CaCO3）中以三种含水量（田间持水量的80％，100％和120％）生长35天。在田间持水量为70％的情况下，将其与肥沃的黑色开裂粘土对照土壤的生长进行了比较。在播种后第14、21、28和35天记录视觉萎黄评分，叶绿素仪读数，叶数和枝干重量。还测量了最年轻的完全膨胀叶片中的叶绿素，活性铁和营养素的浓度。结果表明，增加土壤水分会增加所有基因型的褪绿症状的严重程度（增绿作用分数）。在所有水分含量下，耐性基因型表现出的症状明显少于其他基因型。在钙质土壤中，所有基因型在含水量为80％时都能从萎黄病症状中恢复。叶绿素得分与叶绿素计读数，叶绿素浓度和叶面活性以及总铁和锰浓度呈负相关。视觉萎黄评分似乎是一种能够对基因型耐受性进行分类的经济有效，准确而有效的方法。褪绿的症状可能是由于HCO3-引起的营养缺乏或HCO3-对叶绿素合成的直接影响。这项研究表明，最可能的耐受机制与防止HCO3-吸收或有效隔离HCO3-根部内部的能力有关，这防止了内部pH的增加和向芽的转运。

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