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Metal accumulation and its effect on leaf herbivory in an allopolyploid species Arabidopsis kamchatica inherited from a diploid hyperaccumulator A. halleri
Plant Species Biology ( IF 1.4 ) Pub Date : 2020-12-01 , DOI: 10.1111/1442-1984.12304
Rie Shimizu‐Inatsugi 1 , Silvija Milosavljevic 1 , Kentaro K. Shimizu 1, 2 , Gabriela Schaepman‐Strub 1 , Keitaro Tanoi 3 , Yasuhiro Sato 4, 5
Affiliation  

Excessive amounts of metal ions in soil are toxic for most plant species, yet metal can also facilitate plant survival by elemental defense against herbivores and pathogens. Zinc and cadmium hyperaccumulation in Arabidopsis halleri is known to be effective for the defense against natural enemies. The allotetraploid species A. kamchatica, derived from A. halleri and a non‐hyperaccumulator A. lyrata, has a lower hyperaccumulation level of zinc than A. halleri, but its significance for elemental defense remains unknown. In this study, we evaluated the accumulation levels of zinc and cadmium in the allotetraploid compared with its diploid progenitors, and evaluated the contribution of metal treatments to anti‐herbivore resistance under field conditions. The accumulation level of zinc in A. kamchatica was intermediate between the progenitors, but that of cadmium was lower than in both diploid progenitors. The elemental defense of A. kamchatica and A. halleri was supported by a field experiment comparing the herbivory level between a control group and metal‐supplemented plants. Moreover, the effect of elemental defense was lower in A. kamchatica than in the hyperaccumulator progenitor A. halleri, which is consistent with the metal accumulation level. This result reveals that the allotetraploid plant inherited its hyperaccumulating ability from one progenitor as an advantageous trait but at an intermediate level.

中文翻译:

从二倍体超积累A. halleri遗传的异源多倍体物种拟南芥kamchatica中的金属积累及其对叶片草食动物的影响

土壤中过量的金属离子对大多数植物物种有毒,但是金属还可以通过对食草动物和病原体的元素防御来促进植物存活。众所周知,拟南芥中的锌和镉积累过多,可有效防御天敌。源自A. halleri和非超蓄积性A. lyrata的同种四倍体物种A. kamchatica具有比A. halleri更低的锌超富集水平,但其对元素防御的意义仍然未知。在这项研究中,我们评估了同种四倍体与其二倍体祖细胞相比锌和镉的积累水平,并评估了田间条件下金属处理对抗草食动物的贡献。锌在A. kamchatica中的积累水平介于两个祖细胞之间,但镉的水平低于两个二倍体祖细胞。田间试验比较了对照组和添加金属的植物之间的食草水平,从而支持了kamchaticahalleri的基本防御。此外,A。kamchatica中元素防御的作用比高蓄积祖细胞中的低Halleri,与金属积累水平一致。这一结果表明,异源四倍体植物从一个祖先那里继承了其超积累能力,这是一种有利的性状,但处于中等水平。
更新日期:2020-12-01
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