کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4554490 | 1628081 | 2013 | 10 صفحه PDF | دانلود رایگان |
• Accessions from several Noccaea/Thlaspi species were compared in common conditions.
• Differences in metal uptake and accumulation were evidenced.
• Sequence analysis has identified significant polymorphisms in target genes.
• A trade-off between genetic variation and adaptation to metalliferous soils is discussed.
Forty-seven accessions of Noccaea and Thlaspi grown in the presence of Ni were phenotyped for leaf mineral concentrations and morphology. Sequences of 9 target genes involved in metal homeostasis were compared in a Ni-adapted population of Noccaea caerulescens grown on the serpentine Monte Prinzera (MP), and in accessions from metalliferous and non-metalliferous soils. The MP population, which resembled most the Zn/Cd accumulators from Austria, showed little genetic variation. Higher levels of sequence variation found in target genes compared to non-target genes, suggest that selective pressure by exposure to high concentrations of metals may have led to adaptation to metalliferous environments, in trade-off with genetic variation. The ZNT2 zinc deficiency responsive zinc transporter gene showed significant variation in a selection test. The hydrophobicity profile of ZNT2 variants indicates, in this case, sequence variation is likely to affect the function of the encoded protein.
Journal: Environmental and Experimental Botany - Volume 96, December 2013, Pages 1–10