Variation in tuber mineral concentrations among accessions of Solanum species held in the Commonwealth Potato Collection

Abstract

Abstract:The variation in tuber mineral concentrations amongst accessions of wild tuber-bearing Solanum species in the Commonwealth Potato Collection (CPC) was evaluated under greenhouse conditions. Selected CPC accessions, representing the eco-geographical distribution of wild potatoes, were grown to maturity in peat-based compost under controlled conditions. Tubers from five plants of each accession were harvested, bulked and their mineral composition analysed. Among the germplasm investigated, there was a greater range in tuber concentrations of some elements of nutritional significance to both plants and animals, such as (Ca, Fe and Zn; 6.7, 3.6, and 4.5-fold respectively) than others, such as (K, P and S; all <3-fold). Significant positive correlations were found between mean altitude of the species' range and tuber P, K, Cu and Mg concentrations. The amount of diversity observed in the CPC collection indicates the existence of wide differences in tuber mineral accumulation among different potato accessions. This might be useful in breeding for nutritional improvement of potato tubers. Powered by Editorial Manager® and ProduXion Manager® from Aries Systems Corporation AbstractThe variation in tuber mineral concentrations amongst accessions of wild tuber-bearing Solanum species in the Commonwealth Potato Collection (CPC) was evaluated under greenhouse conditions. Selected CPC accessions, representing the eco-geographical distribution of wild potatoes, were grown to maturity in peat-based compost under controlled conditions. Tubers from five plants of each accession were harvested, bulked and their mineral composition analysed. Among the germplasm investigated, there was a greater range in tuber concentrations of some elements of nutritional significance to both plants and animals, such as (Ca, Fe and Zn; 6.7, 3.6, and 4.5-fold respectively) than others, such as (K, P and S; all <3-fold). Significant positive correlations were found between mean altitude of the species' range and tuber P, K, Cu and Mg concentrations. The amount of diversity observed in the CPC collection indicates the existence of wide differences in tuber mineral accumulation among different potato accessions. This might be useful in breeding for nutritional improvement of potato tubers.

Metabolomics and Ionomics of Potato Tuber Reveals an Influence of Cultivar and Market Class on Human Nutrients and Bioactive Compounds

“…Importantly, key minerals essential for human development and nutrition (e.g., Fe, Zn, Co, and Ca) significantly varied within potato market class (Table 3 and Figure 7B ). For example, iron showed a 3 mFV within potato market classes, which supports data from previous studies ( 126 ). The combination of low phytic acid and high ascorbic acid in potato tubers increases iron bioavailability allowing for even small increases in potato tuber iron content to help overcome human iron deficiency ( 126 ).…”

“…For example, iron showed a 3 mFV within potato market classes, which supports data from previous studies ( 126 ). The combination of low phytic acid and high ascorbic acid in potato tubers increases iron bioavailability allowing for even small increases in potato tuber iron content to help overcome human iron deficiency ( 126 ). Studies focusing on increasing iron content in potato tubers revealed moderate heritability estimates ( 127 ).…”

Variation of mineral contents with nutritional interest in a collection of Solanum tuberosum group Phureja tubers

“…1). Similar to our results, positive correlation among K, Ca, Fe and Zn has been described before in potato tubers (Subramanian et al., 2017). Furthermore, a positive correlation between Ca and Fe and between Zn and Fe but no correlation between Ca and Zn has been described previously (Andre et al., 2007).…”

“…The prevalence of K towards the other minerals seems to be a common feature in potato tubers. This fact can be seen not only in the current research, but also in other reports when collections of potato tubers were either analysed raw and unpeeled (Subramanian et al., 2017; Saar‐Reismaa et al., 2020) or raw and peeled (Wu et al., 2020).…”

“…A more recent study analysed raw and unpeeled potato tubers from different taxonomic Groups (49 genotypes). The maximum amounts of minerals found were as follows: 26 860 mg K kg −1 DW, 670 mg Ca kg −1 DW, 40 mg Fe kg −1 DW and 27 mg Zn kg −1 DW (Subramanian et al., 2017). The prevalence of K towards the other minerals seems to be a common feature in potato tubers.…”