Identification of Quantitative Trait Loci for Altitude Adaptation of Tree Leaf Shape With <i>Populus szechuanica</i> in the Qinghai-Tibetan Plateau.

To test the significance effect of altitude, F-value ( Table 1 ) for altitude effect was 105.834, 107.570, and 117.366 respectively for trait of leaf width, leaf length and leaf area, all of which had reached to the extremely significant level.

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