柠檬桉叶水浸提液对蓝莓幼苗根生长及部分生理指标的影响

摘要

通过土培试验就不同质量浓度(0、10、20、40、60和80 g/mL)柠檬桉 (Eucalyptus citriodora Hook.f.) 叶水浸提液对蓝莓 (Vaccinium spp.) 幼苗根生长及部分生理指标的影响进行了研究.结果表明:蓝莓根系活力随柠檬桉叶水浸提液质量浓度的增加先升高后降低,在质量浓度20 g/mL时根系活力最大,各处理间差异显著(P<0.05),但浸提液对根系干质量的影响不显著.低质量浓度(≤20 g/mL)柠檬桉叶水浸提液可显著提高蓝莓叶片叶绿素a、叶绿素b和总叶绿素质量分数,但高质量浓度(≥60 g/mL)时则表现为显著降低作用.高质量浓度(≥60 g/mL)柠檬桉叶水浸提液可显著提高蓝莓叶片相对电导率和叶绿素a/b,而低质量浓度则没有显著影响.由此表明蓝莓对柠檬桉叶水浸提液不太敏感,表现出一定耐受性,但超过一定质量浓度范围时,则会出现明显的受害特征.%Effects of different concentration (0, 10, 20, 40, 60 and 80 g/mL)water extracts of Eucalyptus citriodora Hook.f.leaves on root growth and some physiological indices of Vaccinium spp.seedlings were studied based on soil culture experiments.The results showed that the root activity of Vaccinium spp.increased first and then decreased with concentration of water extracts of E.citriodora leaves, and reached the peak with 20 g/mL.The root activity was significantly different but dry mass of root was insignificantly different between different concentration treatments.Low concentration (≤20 g/mL) water extracts significantly improved chlorophyll a, chlorophyll b and total chlorophyll of Vaccinium spp.leaves, but high concentration (≥60 g/mL) of water extracts significantly reduced those(P<0.05).High concentration (≥60 g/mL) water extracts of significantly improved relative conductivity rate and chlorophyll a/b of Vaccinium spp.leaves, but low concentration of water extracts had no significantly effect.These investigations indicated that Vaccinium spp.had a less sensitive and a certain tolerance to the water extracts of E.citriodora, but a significant inhibition of growth occurred with a higher concentration of water extracts.