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Single-Plant Selection at Ultra-Low Density to Improve Stability of a Bread Wheat Cultivar

^a Dep. of Agricultural Development, Democritus Univ. of Thrace, Orestiada, 68200, Greece
^b Technological Education Inst. of Kalamata, 24100, Greece
^c Hellenic Sugar Industry SA, Larissa, 41110, Greece
^d Technological Education Inst. of W. Macedonia, Florina, 53100 Greece

View larger version (24K): [in a new window]   Fig. 1. Experimental procedure across two sites and five growing seasons. Pedigree single-plant selection was conducted for two generations under the ultra-low density (ULD) of 1.2 plants/m2 in honeycomb trials (NR0 and R21). Progeny families were tested under ULD in R21 trials, typical crop density (TCD) of 500 plants/m2 in RCB trials, and four densities (100, 300, 500, 700 plants/m2) in SPLIT-PLOT trials.

View larger version (24K): [in a new window]   Fig. 2. Single-plant yield frequency distribution of the source material (a), and of the first generation H (continues line) and L (dotted line) families in Site 1 (b) and Site 2 (c), under the ultra-low density (ULD) of 1.2 plants/m2. ( = mean yield, CV = coefficient of variation, Sk. = skewness, Kur. = kurtosis, n = number of harvested plants). P < 0.05, P < 0.01, P < 0.001.

View larger version (31K): [in a new window]   Fig. 3. Mean experimental performance of the families H2 and H10 under ultra-low density (ULD), typical crop density (TCD), and four densities on average (SPLIT PLOT), being significantly superior over cv. Nestos in both generations.

View larger version (10K): [in a new window]   Fig. 4. The average response of the five H first generation families to density changes, and in relevance to cv. Nestos. The equation of line is y = 4 x 10–5X2 – 0.04X + 113. Data obtained from the SPLIT PLOT trials (four densities, two locations, and 2 yr).