Abstract:

In this study, the wood properties of 92 one-year-old and 65 four-year-old Populus nigra clones were measured. QTLs analysis was combined with the measured result with 171 SSR marker loci, and the research showed that the wood basic density (WBD) of one-year-old and four-year-old was 0.308 8 g·cm^-3 and 0.355 2 g·cm^-3 , the fibre length(FL) was 601.3 μm and 649.4 μm, the fibre width(FW) was 21.81 μm and 23.11 μm and the microfibre angle(MFA) was 26.5° and 26.1° respectively. The contents of benzene-alcohol extraction, holocellulose, α-cellulose and lignin of four-year-old P. nigra were 2.32%, 78.62%, 41.48% and 20.93% respectively. SSR marker loci correlated with WBD, MFA, FL and FW of one-year-old P. nigra were identified to be 3,5,2 and 4 respectively, and their contributions ranged from 6.43% to 23.18%. In four-year-old P. nigra, SSR marker loci correlated with WBD, FL, MFA, holocellulose, α-cellulose and lignin were identified to be 1, 1, 2, 2, 2 and 1 respectively, and the contributions ranged from 7.41% to 28.56%. These markers might be useful for wood property improvement if using them correctly in breeding program.

Key words: Populus nigra, SSR marker, wood property