Invasive Species Compendium

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Abstract

Advances in the triploid breeding programme of Populus tomentosa in China.

Abstract

Advances of in the breeding of allotriploids of Populus tomentosa are reported from China. By combining chromosome doubling with interspecific hybridization and pollen radiation, 20 allotriploid clones of backcross hybrids of (P. tomentosa × P. bolleana [P. alba var. pyrimidalis]) × P. tomentosa have been successfully screened. Stem volume of the best clone (B301) surpassed 0.36 m3 per tree (19.9 m in height and 24.1 cm in diameter) in an 8-yr-old plantation at 3×3 m spacing, which is a gain of 255% over that of the local diploid counterpart. It is demonstrated that the genetic composition of the breeding materials and the breeding methods used are essential to the expected genetic gains. Plus-tree selection from diploids can only generate a 45% gain, while backcross hybrid selection from diploids and allotriploids (B301) can generate 155 and 255% gain, respectively. It is clear that choosing the proper material and method is the key to the breeding success of Populus tomentosa.