两种荷花Corniculatus L.种对组合涝渍-盐胁迫的响应不同,Plant Biology

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两种荷花Corniculatus L.种对组合涝渍-盐胁迫的响应不同
Plant Biology ( IF 4.2 ) Pub Date : 2020-11-15 , DOI: 10.1111/plb.13216
C. J. Antonelli ₁ , P. I. Calzadilla ₁ , M. P. Campestre ₁ , F. J. Escaray ₁ , O. A. Ruiz ₁

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涝渍和盐渍化损害了世界范围内的作物生长和生产力，它们的综合作用大于两个胁迫分别的相加作用。在这里，从沿海地区发生高涝-盐胁迫事件的频率高的地区收集了普通草料四倍体莲花角ic（c。San Gabriel）和二倍体角.L。的添加物，以评估其对涝渍，盐分的耐受性，并将这两种胁迫相结合。我们假设，由于其环境利基，与四倍体的L. corniculatus相比，二倍体的种质将表现出更好的对水涝综合胁迫的适应性。
在控制条件，涝渍，盐度和涝渍-盐渍综合处理下对植物进行了33天的评估。评估枝条和根的生长，以及叶绿素荧光和气体交换测量。结果表明，四倍体添加对盐度和涝渍的影响更为严重，在组合胁迫条件下观察到的影响更大。
钠的浓度⁺，氯^-和K ⁺在顶部和基部叶片进行测定，并在根部。的Na的较大的累积⁺和Cl ^-既盐水下观察，为四倍体组合胁迫处理L.百脉，对此离子毒性效应是很明显的。
的表达CLC基因，编码为C1 ^-转运蛋白，仅在二倍体增加L.百脉植物响应于合并的胁迫条件下，这表明离子室化机制在此加入诱导。因此，这种最近表征的L. corniculatus可以用于在其他用作饲料的莲花品种中引入新的耐性性状。

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Contrasting response of two Lotus corniculatus L. accessions to combined waterlogging–saline stress

Waterlogging and salinity impair crop growth and productivity worldwide, with their combined effects being larger than the additive effects of the two stresses separately. Here, a common forage tetraploid Lotus corniculatus (cv. San Gabriel) and a diploid L. corniculatus accession, collected from a coastal area with high frequency of waterlogging–saline stress events, were evaluated for tolerance to waterlogging, salinity and these two stresses combined. We hypothesize that, due to its environmental niche, the diploid accession would show better adaptation to combined waterlogging–saline stress compared to the tetraploid L. corniculatus.
Plants were evaluated under control conditions, waterlogging, salinity and a combined waterlogging–saline treatment for 33 days. Shoot and root growth were assessed, together with chlorophyll fluorescence and gas exchange measurements. Results showed that salinity and waterlogging effects were more severe for the tetraploid accession, with a larger effect being observed under the combined stress condition.
Concentrations of Na⁺, Cl⁻ and K⁺ were measured in apical and basal leaves, and in roots. A larger accumulation of Na⁺ and Cl⁻ was observed under both saline and combined stress treatments for the tetraploid L. corniculatus, for which ion toxicity effects were evident.
The expression of CLC gene, coding for a Cl⁻ transporter, was only increased in diploid L. corniculatus plants in response to the combined stress condition, suggesting that ion compartmentalization mechanisms were induced in this accession. Thus, this recently characterized L. corniculatus could be used for the introduction of new tolerance traits in other Lotus species used as forage.

更新日期：2020-11-15

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