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Outline
To investigate the effects of two microbial fertilizers on the growth and photosynthetic characteristics of Camellia oleifera seedlings, and to provide some practical references and theoretical support for the nutrient management of Camellia oleifera.
The growth indexes, gas exchange parameters, chlorophyll fluorescence parameters and antioxidant enzyme activities of Camellia oleifera seedlings were measured after applying two kinds of microbial fertilizers, and combined with the principal component and subordinate function analysis to comprehensively evaluate the effects of different treatments and screen the optimal fertilizers and application rates.
The application of microbial fertilizer significantly promoted the growth and photosynthetic characteristics of Camellia oleifera. Compared with the control group (CK), A4 and L2 treatments increased plant height by 71.74% and 67.94%, respectively; A2 and L2 treatments increased ground diameter by 60.00% and 45.40%, respectively. Chlorophyll and carotenoid contents were significantly increased by A3 and L3 treatments, where the increase in chlorophyll a, chlorophyll b, total chlorophyll and carotenoids were 147.64%, 90.62%, 122.08%, 213.43% and 130.27%, 121.03%, 126.85% and 280.07%, respectively. The A2 treatment increased the net photosynthetic rate (Pn) compared to the 93.03% and 66.66% in the control (CK) and nitrogen fertilizer treatment (N), respectively. qP and ETR of A2-treated leaves were 31.03% and 35.95% higher than that of CK, and 46.15% and 33.75% higher than that of N group, respectively. In addition, superoxide dismutase (SOD) activities of A4 and L2 treatments were significantly higher than CK and N by 24.69%, 28.57% and 51.82%, 56.54%, respectively, while peroxidase (POD) and catalase (CAT) activities were enhanced. The comprehensive evaluation of principal component analysis and affiliation function indicated that the growth, photosynthetic characteristics and antioxidant enzyme activities of Camellia oleifera performed best under A2 treatment.
The microbial fertilizer and Randidobond significantly promoted the growth of Camellia oleifera seedlings, and enhanced the antioxidant enzyme activities by increasing the chlorophyll content, gas exchange parameters, chlorophyll fluorescence parameters of the leaves, effectively enhanced the photosynthesis of the plants, and provided a strong support for the high-efficiency cultivation of Camellia oleifera.
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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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