Subjects: Biology >> Botany >> Applied botany submitted time 2021-12-19 Cooperative journals: 《广西植物》
Abstract： Melia azedarach is widely distributed in China and has a wide range of genetic variation. In order to study the growth characters of 1-year-old seedlings of M. azedarach from different seed sources, the growth characters of seedling height, ground diameter, compound leaf growth and biomass accumulation of M. azedarach seedlings from 15 seed sources were observed, and the growth rhythm was fitted by logistic equation. The results were as follows: (1) There were significant differences in seedling height, ground diameter, root biomass, stem biomass and compound leaf correlation between different habitats(P<0.05 or P<0.01). (2) The growth of seedling heights and ground diameters showed a slow-fast-slow growth pattern with type S. Compared with the emergence time of seedling height growth peak, the emergence time of ground diameter growth peak was later. (3) The R2 of logistic fitting equation was 0.976-0.994, which reached the highly significant correlation level, indicating that the growth rhythm of M. azedarach could be fitted by logistic equation. (4) According to theoretical calculation and practical observation, the duration of fast-growing stage of ground diameter was generally 20-30 d longer than that of high-speed growth stage of seedling. The time of seedling heights and ground diameters entering fast-growing stage and ending fast-growing stage in northern locality was earlier than that in southern locality. The cumulative growth of seedling height and ground diameter in fast-growing stage was more than 60% of the total growth.（5）All though traits were negatively correlated with latitude, seedling height, biomass of root and leaf area were positively correlated with longitude, the other traits were negatively correlated with longitude. In general, M. azadarach begongs to full-time growth type with significant differences in growth traits among seed sources. The growth was regulated by latitude and longitude, mainly by latitude .
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