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| Effects of Foliar Spraying Melatonin on Strawberry Growth，Photosynthesis and Fruit Quality |
| LI Gongfeng，GAO Yaxin，MA Wancheng，ZHANG Zhenxing，LIU Yike，LI Ning，LI Qingyun* |
| College of Horticulture，Hebei Agricultural University， Vegetable Industry Collaborative Innovation Center of Hebei Province，Baoding 071000，Hebei，China |
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Abstract In order to explore the effects of foliar spraying melatonin on strawberry growth，photosynthesis and fruit quality，this experiment took‘Xiangye’ strawberry as test material；sprayed 150，300，450 μmol · L-1 melatonin solutions（being T1，T2，T3，T4 treatments）and pure water（as the contrast）regularly from the first fruit blooming stage to maturing stage；and measured the strawberry growth index，chlorophyll content，chlorophyll fluorescence parameters，photosynthetic parameters and fruit quality，etc．The results showed that the appropriate melatonin concentration could significantly promote the plant growth and leaf blade photosynthesis，and improve fruit quality．With the increase of melatonin concentration，plant petiole length，leaf area，leaf blade SPAD value，single fruit weight，Fv/Fm，Fv/Fo，ABS/RC and net photosynthetic rate of strawberry showed a tendency of first increasing then decreasing．The leaf petiole length，leaf area，leaf blade SPAD value and single fruit weight of strawberry treated by T3 were the highest and significantly higher than those of the contrast，being higher than the contrast by 47.98%，62.22%，16.82% and 38.68%，respectively．The leaf petiole length and leaf blade SPAD value of T2 treatment were significantly higher than those of the contrast．The contents of fruit soluble solid matter，soluble protein，soluble sugar，and VC were the highest，while the contents of titratable acid were the lowest．The contents of fruit soluble solid matter，soluble protein，soluble sugar，titratable acid and VC were increased than the contrast by 3.93，0.24，2.69，-0.12 percentage points and 50.65%，respectively．Moreover，the single fruit weight was increased by 23.12% than the contrast．The contents of fruit free amino acid，flavonoid and polyphenol treated by T1 were significantly higher than those of the contrast by 16.34%，61.19% and 57.01%，respectively．In conclusion，foliar spraying 300 μmol · L-1 melatonin on strawberry at the first fruit was benefit to improve facility strawberry quality and increase its yield as well．
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Received: 30 May 2022
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