混种少花龙葵嫁接后代对镉胁迫枇杷幼苗光合生理的影响

采用盆栽试验,将4种少花龙葵嫁接后代分别和枇杷(大五星枇杷和川早枇杷)幼苗混种于镉含量为10 mg/kg的污染土壤中,研究了混种对两种植物光合生理的影响。结果表明:混种后,枇杷幼苗相应的叶绿素a含量、叶绿素b含量、叶绿素总量、净光合速率、蒸腾速率、胞间CO2浓度、气孔导度及可溶性糖含量均高于单种,叶表面蒸汽压亏缺降低;少花龙葵嫁接后代相应的SPAD值和净光合速率、蒸腾速率、胞间CO2浓度、气孔导度均高于单种,其可溶性糖含量较单种有所降低,混种大五星枇杷的少花龙葵嫁接后代的叶表面蒸汽压亏缺高于其单种,但混种少花龙葵嫁接后代的川早枇杷叶表面蒸汽压亏缺低于其单种。因此,少花龙葵嫁接后代混种枇杷可提高两种植物的光合作用,进而可促进两种植物的生长。

Effects of Intercropping with Post-Grafting Generation of Solanum Photeinocarpum on Photosynthetic Physiology of Loquat Seedlings Under Cadmium Stress

A pot experiment was conducted to study the effects of intercropping with post-grafting generation of Solanum photeinocarpum on photosynthetic physiology of loquat seedlings under cadmium (Cd) stress, in which 4 post-grafting generations of S. photeinocarpum were intercropped with two kinds of loquat seedlings (Dawuxing and Chuanzao) in Cd-contaminated soil. The results showed that, compared with the monoculture, intercropping significantly improved chlorophyll a, chlorophyll b and total chlorophyll contents, net photosynthetic rate, transpiration rate, intercellular CO₂ concentration, stomatal conductance and soluble sugar content of loquat seedling, decreased the vapor pressure deficit on leaf surface. SPAD and net photosynthetic rate, transpiration rate, intercellular CO₂ concentration, stomatal conductance of the post-grafting generation of S. photeinocarpum inter crop-Red were higher than those of monoculture, while the soluble sugar content was lower, the vapor pressure deficit on leaf surface of the post-grafting generation of S. photeinocarpum intercropped with Dawuxing seedling was higher than the that of monoculture, but the early Sichuan loquat was lower. Therefore, the post-grafting generations of S. photeinocarpum intercropping with loquat could enhance the photosynthesis of these two plant species, thus could promote the growth of them.