چکیده
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Interest in growing winter spinach (Spinacia oleracea L.) in Iran is increasing due to its
good nutritional potential returns relative to other vegetable crops. The objectives of this
research were to investigate the interrelationships among different traits of spinach and to
evaluate different Iranian spinach landraces with application of the genotype × trait (GT)
biplot methodology in visualizing research data. 81 spinach landraces were grown during
2-years according to randomized complete block design with four replications. Ranking
of the genotypes based on the ideal entry revealed that genotypes G1, G20, G7, G8, G9,
G27, G49 G70 and G79 were higher in the measured traits and could be good candidates
for improving most of the measured traits. Ranking of traits for the leaf yield showed that
petiole diameter, petiole length, leaf numbers at flowering, 1000-seed weight and root dry
weight were the most discriminating traits which influence spinach leaf yield at both
years. There were 9 winning genotypes and 4 which-won-where patterns at the first year
while there were 8 winning genotypes and 4 which-won-where patterns at the second
year. As a result, the findings from our study are as follows: (i) traits leaf numbers at
flowering, leaf length, leaf width, leaf area, petiole diameter and petiole length could be
as selection indices for spinach leaf yield improvement, (ii) genotypes G1, G20, G7, G8,
G9, G27, G49 G70, and G79 were the most favorable and is thus recommended for
commercial release or incorporating in breeding programs; (iii) the GT biplot method can
be used to identify superior genotypes in other crops and in other parts of the world.
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