Grain yield and porphology of dwarf vs tall white lupin in Mediterranean environments
2017
Annichiarico, Paolo | Carroni, Antonio Melchiorre | Manunza, P. | Huyghe, Christian | Pecetti, Luciano
There is lack of information on the preferable plant architecture of white lupin (Lupinus albus L.) for Mediterranean environments. The objective of this study was to compare tall vs dwarf near-isogenic lines from two gene pools for grain yield and plant morphology. The four lines were assessed in a Mediterranean-climate site of Sardiniafor two seasons under two sowing densities (25.4 and 35.5 seeds/m2). On average, one gene pool (#15) exhibited a semi-determinate growth habit on the basis of its high seed proportion on the main stem relative to the other, indeterminate gene pool #16 (54.9 % vs 45.5; P < 0.05). As expected, dwarfism reduced plant stature (106 vs 124cm) and increased the harvest index (0.293 vs 0.250). Compared with the tall variant, dwarfism led to significantly (P < 0.05) higher grain yield in the gene pool #16, and lower yield in the gene pool #15, giving rise to significant plant stature × gene pool interaction (P < 0.05). Sowing densities and seasons did not differ for grain yield, nor interacted significantly with plant stature or gene pool for this variable (P > 0.05). Although preliminary, our results for Mediterranean environments highlight the genotype-specific usefulness of dwarfism and suggest that this trait might be beneficial in germplasm with indeterminate growth habit.
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