|Busse, James - UNIV OF WI-MADISON, HORT|
|Palta, Jiwan - UNIV OF WI-MADISON, HORT|
Submitted to: American Journal of Potato Research
Publication Type: Abstract Only
Publication Acceptance Date: June 1, 2006
Publication Date: February 1, 2007
Citation: Busse, J.S., Bamberg, J.B., Palta, J.P. 2007. Correlation between aerial shoot and tuber calcium accumulation in solanum genotypes segregating for tuber calcium uptake efficiency [abstract]. American Journal of Potato Research. 84:79. Technical Abstract: INCREASING tuber calcium concentration improves tuber quality and increases resistance to biotic and abiotic stresses. Genetic variability for tuber calcium efficiency has been reported. We investigated the relationship between stem, leaf, and tuber calcium in three F2 families segregating for tuber calcium uptake efficiency from extreme parents Solanum kurtizianum (ktz) and S. microdontum (mcd). Plants were grown in a controlled environment facility and watered with 1/4 x strength Hoagland's nutrient solution adjusted to either 5 or 25 ppm calcium. Data was collected on tuber yield, size and number. Calcium values were determined for the stem, first two fully expanded leaves and nonperiderm tuber tissue. Calcium accumulation in stem, leaf and tuber overwhelmingly cosegregated by genotype. In all cases, mcd accumulated the most calcium and ktz tended to accumulate the least calcium. Tuber calcium values ranged from 173 to 523 ppm Ca g-1DW. Stem calcium values ranged from 14,876 to 31,248 ppm Ca g-1DW. Leaf calcium values were consistently higher than stem values. Correlations existed between calcium values in stem and tuber (R2=0.6791), leaf and tuber (R2=0.5385) and leaf and stem (R2=0.7832). Plants watered with 25 ppm Ca nutrient solution consistently had calcium values in stems, leaves and tubers which were higher than the same genotype watered with 5 ppm Ca nutrient solution. Wild germplasm holds potential for increasing tuber calcium levels. Calcium accumulation efficiency between the tubers and aerial shoot appears to be positively correlated. Furthermore, aerial shoots accumulated 60-100 times more calcium than tubers under our experimental conditions.