Abstract
The cowpea (Vigna unguiculata (L.) Walp.) cultivars TVu 354 and Solojo were grown in solution culture at 10 to 1000 μM Ca supply. The Ca supply did not vary by more than 10% during the experiment. The pH value was kept constant within 0.1 units at 4.0 by automatic titration. The cultivar TVu 354 proved to be much more Ca-efficient than Solojo. At 10 μM Ca supply Solojo died, whereas TVu 354 was hardly affected in dry matter production. The differences in Ca efficiency were independent of the P supply. They could not be explained by differences in Ca uptake or Ca concentrations in the plant tissue. Short-term studies using 45Ca, both in the dark and in the light, indicated better transport of Ca from the roots to the shoots and within the shoots to the younger leaves in the Ca-efficient cultivar TVu 354. However, the main reason for the differences between the cultivars in sensitivity to low Ca supply were differences in the Ca requirement of the plant tissue to maintain tissue organization and function. Sequential fractionation of the freeze-dried leaf tissue with hot water, 0.5 M NaCl, 1 M CH3COOH, and 2 M HCl did not reveal cultivar differences in Ca binding state. The results clearly show that considerable genetic potential in tolerance to low Ca supply exists in cowpea. However, a better understanding of the physiological/biochemical reasons for low internal Ca requirement is needed.
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Horst, W.J., Currle, C. & Wissemeier, A.H. Differences in calcium efficiency between cowpea (Vigna unguiculata (L.) Walp.) cultivars. Plant Soil 146, 45–54 (1992). https://doi.org/10.1007/BF00011994
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DOI: https://doi.org/10.1007/BF00011994