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| Effect of 5-Aminolevulinic Acid on Leaf Photosynthetic Characteristics，Yield and Quality of Potato |
| LI Ming’an1，3，MA Li2，HAO Qi3，AN Yuyan3，WANG Liangju3* |
| 1Beidahuang Black Soil Potato Industry Co.，Ltd.，Harbin 150000，Heilongjiang，China；2Seed Potato R & D Center，Beidahuang Black Soil Potato Industry Co.，Ltd.，Qiqihar 161621，Heilongjiang，China；3 College of Horticulture，Nanjing Agricultural University，Nanjing 210095，Jiangsu，China |
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Abstract Application of 50 mg · L-1 5-aminolevulinic acid（ALA）solution to potato（Solanum tuberosum L.cv. Netherlands 806）seedlings at different stages of plant growth，this paper studied the effects of ALA on potato leaves photosynthetic characteristics，and potato yield and quality．The results indicated that ALA could increase the relative chlorophyll content of potato leaves，and especially improve photosynthetic ability at the noon and in the afternoon，and reduce photosynthetic noon break level．Results of the test analysis showed that ALA treatment had increased the maximum photochemical efficiency of PSⅡ and PSⅠ reaction centers of potato leaves（φPo and φRo）；reduced the maximum close rate of PSⅡ reaction center（Mo）；maintained the higher photosynthetic electron transfer quantum yield （φEo） and lower energy dissipation through heat （φDo）．So as to improve the photosynthetic capacity index based on absorption（PIabs）and the total index including PSⅠ and PSⅡ（PItotal）．ALA treatment could also up-regulate the transcriptional level of Psb A and Psb D，coding gene D1 and D2，the core proteins in PSⅡ reaction center．Additionally，ALA treatment had significantly increased the tuber yield and its soluble sugar and vitamin C contents．However，ALA treatment had no significant effect on starch content of the tubers．Therefore，ALA，as a natural non-protein amino acid，may have wide popularization and application prospect in potato industry．
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Received: 26 December 2019
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