The influence of tannin content in faba bean seeds (Vicia faba L.) on germination, vigour, health and yield of seeds

Kolasinska, K.; Wiewiora, B.

Biuletyn Instytutu Hodowli i Aklimatyzacji Roslin 221: 235-251

2002


ISSN/ISBN: 0373-7837
Accession: 003976080

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Abstract
The objectives of the study were to determine the interaction between tannin content and standard germination, vigour and seed health as well as to determine the influence of tannin content of seeds on field emergence, plant health, seed yield and yield components. Field and laboratory experiments were performed on six different faba bean genotypes derived from harvests during 1998-2000. Seeds with low tannin content, commonly considered as tannin less, - from 0.03 to 0.14% (Caspar and BKSK 1074) and high tannin content genotypes - from 0.88 to 1.69% in dry matter (Rajan, Titus, Tim and Bronto) were chosen. Evaluation of the chemical components, standard germination, vigour and seed health was carried out in tests conducted in the laboratory. Under field conditions, seed emergence, plant health, yield and yield components were determined. Seeds with low tannin content depending on the year, exhibited poor germination (~12%), showed lower (~10%) field emergence, and in general were characterized with lower vigour compared to seeds with high tannin content. Seeds with low tannin content were weaker than those with high tannin content. Standard germination (r=0.64), conductivity (r=-0.59) and cold-test (r=0.52) significantly correlated with tannin content. The results suggested that seeds with low tannin content have poor germination and less resistant to suboptimal environmental conditions. In conclusion, it may be stated that the influence of tannin content on germination, health status and tolerance to environmental stress of faba bean seeds seems to be significant with some variation depending on year of harvest.