Abstract
This study was conducted to determine the stabilities and adaptation classes of edible pea lines, which will be cultivated in mild climate regions. Twenty local pea lines selected in previous breeding studies and 6 control varieties were used. The seeds of pea lines were sowed in 4 different locations in 2 sowing times. The experiment was conducted according to the Augmented design. Adaptation classes and stabilities of pea lines and varieties were determined based on fresh pod yield, fresh seed yield and dry seed yield. The mean of fresh pod yield was found as 1185.7 kg da-1. Stable variety was not determined in terms of fresh pod yield among control varieties, which was conducted in the conclusion of evaluation as determining regression coefficient and average reliability. The average of varieties’ fresh seed yield was 693.8 kg da-1, Klein variety showed medium adaptation for all regions. It was found that 3 lines (B15, B33, and B36) among used ones were placed at the same statistically group with this variety. The average of dry seed yield was 267.1 kg da-1 in the experiment, and Klein, Further, Green Pearl, and Lancet varieties were identified as stable varieties in the conclusion of stability analysis. B6, B13, B14, B15, B16, B17, B18, B32, B40 and B42 lines that involved in the same statistically group with these varieties identified were as stable. In the conclusion of the overall evaluation of the experiment, it was found that B6 and B32 lines could be candidates for variety.
Highlights
This study was conducted to determine the stabilities and adaptation classes of edible pea lines, which will be cultivated in mild climate regions
Total temperature demand of peas is 1600-2800 oC for full maturity; generally, it is sowed in autumn in mild climate regions, though it is sowed in early spring in regions where the winter is spent hard
Experiments were carried out at 8 environments with 6 control varieties and 30 lines. Their yield values and averages belonging to parameters required for stability and statistical grouping were given at Table 3
Summary
This study was conducted to determine the stabilities and adaptation classes of edible pea lines, which will be cultivated in mild climate regions. Stable variety was not determined in terms of fresh pod yield among control varieties, which was conducted in the conclusion of evaluation as determining regression coefficient and average reliability. The average of dry seed yield was 267.1 kg da-1 in the experiment, and Klein, Further, Green Pearl, and Lancet varieties were identified as stable varieties in the conclusion of stability analysis. In Turkey, cultivation area of dry pea is 907 ha, production amount is 2603 tons, average yield is 287.0 kg da-1; vegetable pea cultivation area is 10 917 ha, production amount is 107 344 tons, the average yield is 983.2 kg da-1 for fresh consumption According to these statistics, Turkey takes the last ranks among countries, which cultivate pea. If genotype x environmental interactions are significant, the breeder should determine genotypes that do not show much variability in their productivity under changing environmental conditions, that is to say stable genotypes (Bozoğlu and Gülümser 2000)
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