Subjects: Biology >> Botany >> Applied botany submitted time 2020-05-28 Cooperative journals: 《广西植物》
Abstract： The native communities of Manglietia patungensis are difficult to regenerate naturally, and seedlings or saplings are rarely found under the forest. To explore the tolerance of seed germination and the growth period of bud seedlings under drought stress, this study employs the seeds of M. patungensis with different mass concentrations of polyethylene glycol (PEG-6000) to analyze the effects of drought stress on seed germination, sprout growth and related physiological and biochemical indexes under different simulate drought treatments. The results showed that the concentration of PEG solution had a significant impact on seed germination and sprout growth of M. patungensis (P <0.05). The germination and survival rate gradually decreased with the increase of PEG mass concentration. When the PEG mass concentration was more than 301 g·L-1, seed germination was inhibited, and the germination time was significantly delayed. The chlorophyll content of M. patungensis buds decreased gradually with the increase of the degree of drought stress; the content of soluble protein and the activity of SOD enzyme increased and then decreased; while the content of proline, MDA and the activity of POD and APX enzyme increased. In summary, the water demand for seed germination and bud growth of M. patungensis is obvious. Although it can adapt to a certain degree of drought stress through osmotic adjustment and increase protective enzyme activity, it is necessary to prevent drought damage in the breeding process. The research provides a theoretical basis for seed reproduction and regeneration of M. patungensis, and contribute to the population expansion.
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