The comparison of genotypes with and without tannins of faba bean in Gorgan climatic conditions

Document Type : Research Paper

Abstract

Background and objectives: There are two types of faba bean varieties - tannin and low tannin (zero tannin). Tannins are anti-nutritive compounds that affect quality and digestion. This study was performed to evaluate the performance of genotypes zero tannins genotypes whit tannin genotypes.
Materials and methods: This experiment was conducted in the crop year of 2015-2016 in agricultural research station of Gorgan, in RCBD with three repetitions. 11 different faba bean genotypes (five tannin genotypes, five zero tannin genotypes, and Barakat as control genotype) were evaluated in the terms of agronomic traits of plant height, number of pods per plant, 100-seed weight, grian yield and green pod yield, biological yield and harvest index.
Results: The results of variance analysis showed a significant difference between genotypes in terms of plant height, number of pod per plant, 100-seed weight, seed yield, biomass yield, green pod yield and harvest index. The results of mean comparisons showed that GF-311 and GF-332 both from tannin genotypes had the most seed yield (6746 and 6426 kg ha-1 respectively). The minimum seed yield (3540 kg ha-1) was referred to GF-98 zero tannin. The green sheath yield varied from 15080 to 33067 kg. The least amount was referred to GF-98 (zero tannin) and the maximum amount was referred to GF-20 (control). The yield of biomass varied from 29000 to 57333 kg ha-1. The GF-247 genotype (no tannin) had the maximum and GF-98 (zero tannin) had the minimum yield. According to mean comparisons, the maximum weight of 100-seed with 158.33 gr belonged to GF-21 (tannin group) and the minimum with 102 gr belonged to GF-249 (zero tannin). The results of group comparisons showed no difference between two groups of tannin and zero tannin in terms of plant height, green pod yield and biomass yield. Generally, the tannin genotypes considering traits including, 100-seed weight, seed yield and harvest index were better than none tannin genotypes.
Conclusion: In this study, tannin genotypes considering the most of studied traits had a significant predominance to zero tannin genotypes. As a result, if the goal of faba bean production is to obtain high yields, using tannin genotypes in Gorgan climatic conditions is preferred. On the other hand, according to the results of this survey, the seed yield of zero tannin genotypes was similar to Barakat genotype and because none tannin genotypes had higher quality and are better than Barakat genotype, in case of repeating these results (similarity of performance of zero tannin and tannin genotypes) in future experiments, expansion and harvesting is justified in the region.

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