| Effects of combined application of gibberellin and phosphorus fertilizer on photosynthetic enzyme activity and grain yield of oilseed flax |
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| DOI：10.7606/j.issn.1000-7601.2023.04.08 |
| Key Words: oilseed flax phosphorus fertilizer GA3 photocatalytic assimilation enzyme grain yield |
| Author Name | Affiliation | | WANG Yingze | College of Agriculture, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | CAO Zhi | College of Agriculture, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | GAO Yuhong | College of Agriculture, Gansu Agricultural University, Lanzhou, Gansu 730070, China
State Key Laboratory of Arid Land Crop Science of Gansu Province, Lanzhou, Gansu 730070, China | | WU Bing | State Key Laboratory of Arid Land Crop Science of Gansu Province, Lanzhou, Gansu 730070, China
College of Life Science and Technology, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | WANG Yifan | State Key Laboratory of Arid Land Crop Science of Gansu Province, Lanzhou, Gansu 730070, China | | YAN Bin | College of Agriculture, Gansu Agricultural University, Lanzhou, Gansu 730070, China
State Key Laboratory of Arid Land Crop Science of Gansu Province, Lanzhou, Gansu 730070, China | | CUI Zhengjun | College of Agriculture, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | XU Peng | College of Agriculture, Gansu Agricultural University, Lanzhou, Gansu 730070, China |
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| Abstract: |
| In order to explore the effects of combined application of gibberellin and phosphorus fertilizer on photosynthetic enzyme activity in leaves and grain yield of oilseed flax, we used ‘Lunxuan 2’ as the experiment material. A two\|factor split field experiment was used to study the effects of different phosphorus levels (P2O5: P0：0 kg·hm-2, P1：67.5 kg·hm-2, P2：135 kg·hm-2) and GA3 (gibberellic acid) spraying concentrations (G0：0 mg·L-1, G1：15 mg·L-1, G2：30 mg·L-1) on photosynthetic assimilatory enzymes activity, dry matter accumulation and grain yield of oilseed flax. The results showed that phosphorus fertilizer application and GA3 spraying significantly improved the RuBP (Ribulose-1,5-bisphosphate) carboxylase activity, PEP (Phosphoenolpyruvate) carboxylase activity of leaves and increased the plant dry matter accumulation of the whole growth period and grain yield of oilseed flax. The dry matter accumulation after anthesis and grain yield of oilseed flax at the P0 and P1 levels increased with the increase of GA3 spraying concentration, among which G2 was 8.08%~27.32% and 7.64%~9.04% higher than G0, respectively. The dry matter accumulation of the whole growth period and the RuBP carboxylase activity of leaves under the P2 level were the highest at 1 and 5 days after spraying G1 at budding and anthesis stages of oilseed flax. Under the same GA3 spraying concentrations, the P application treatments significantly increased the photosynthetic assimilatory enzymes activity of leaves, dry matter accumulation and grain yield of oilseed flax. Compared with the treatments without application of P fertilizer and gibberellin, applying P and spraying gibberellin significantly increased PEP carboxylase activity of leaves at anthesis stage, with an average increase of 147.44%~265.87%. And P1G2 and P2G1 treatments significantly increased RuBP carboxylase activity of leaves at budding stage, with an increase of 9.77%~128.82% and 7.14%~126.33%, respectively. During the two growth seasons, the grain yield of oilseed flax was higher in P1G2 and P2G1 treatments, which were significantly higher than that of P0G0 treatment by 15.88% and 17.64% (P<0.05), and higher than other treatments by 2.91%~13.81% and 1.28%~12.94%, respectively. The analysis of interaction effect showed that the interaction effect of phosphorus and GA3 had significant effects on RuBP, PEP carboxylase activity of leaves, dry matter accumulation and grain yield of oilseed flax in the whole growth period. The correlation analysis showed that RuBP and PEP carboxylase activities of oilseed flax leaves were significantly and positively correlated with dry matter accumulation and grain yield. In general, applying 67.5 kg P2O5·hm-2combined with spraying 30 mg·L-1 GA3 and applying 135 kg P2O5·hm-2 combined with spraying 15 mg·L-1 GA3 significantly improved the activity of photosynthetic assimilatory enzymes of leaves at budding and anthesis stages, promoted the dry matter accumulation of oilseed flax, and had a significant grain yield increase effect. Therefore, both treatments can be used as a suitable high\|yield and fertilization management approach for oilseed flax production in the test area. |
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