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Rubber tree is important in global rubber production. In order to reveal the effects of microelement fertilizer combined with absorption enhancer on the growth of rubber tree seedlings, and lay a foundation for the innovation of microelement fertilizer application technology of rubber tree. In this study, the single application of microelement (W), the combination of absorption enhancer formula 1 and microelement fertilizer (C1+W), and the combination of absorption enhancer formula 1 and microelement fertilizer (C2+W) were treated with ultra-pure water as the control to investigate the effects of compound microelement fertilizer application alone or combined with absorption enhancer on the growth, dry matter accumulation, photosynthesis, root development and nitrogen distribution of rubber tree seedlings and their mechanisms. The results showed that micronutrient fertilizer could increase the dry matter accumulation of roots, stems, and leaves in rubber seedlings, thereby increasing the individual fresh weight, dry weight, and dry to fresh ratio. Among them, C2+W increased the fresh and dry weight of plants by 4.18 and 5.89 times, which is much greater than those of C1+W and W. The accumulation of dry matter in rubber seedlings by microelements fertilizers was positively correlated with root length, root surface area, and root volume, and with chlorophyll content, transpiration rate, and net photosynthetic rate of rubber seedlings. The root development and photosynthesis were positively correlated with nitrogen accumulation in various organs of crops, soluble protein content, nitrate reductase activity (NR), glutamine synthase activity (GS), and glutamate dehydrogenase activity (GDH) in leaves. Notably, the single application of microelements fertilizer had no significant effect on NR activity, indicating that W had a weak effect on nitrogen assimilation in the reduction of nitric acid to nitrite. Significantly, the single application of microelements fertilizer (W) had no significant effect on NR activity, indicating that microelements fertilizer had a weak effect on nitrogen assimilation in the reduction of nitric acid to nitrite. In summary, microelements fertilizers and absorption enhancer enhance the connection between C assimilation and N metabolism processes in rubber seedlings, promote the growth and development of rubber seedlings. Considering the wide and thick leaves of rubber, tight cells, and thick stratum corneum, subsequent research should continue to screen more suitable absorption enhancer and optimize the combination with microelements.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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