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In this experiment, the \characteristics of the main results are as follows: 1, compared with suitable temperature and light processing, sub-suitable temperature and light (17 ° C / 12 ° C, the 250 micromol \u0026 m -2 · s -1 ) of tomato seedlings under the net photosynthetic rate (Pn) and stomatal conductance (Gs), carboxylation efficiency (CE) apparent quantum yield (AQY), light the actual photochemical efficiency (ΦPSII,), photochemical quenching coefficient (qP), the antenna conversion efficiency (Fv '/ Fm'), light compensation point (LCP), CO2 compensation point (CCP), chlorophyll content, etc. significantly reduced intercellular CO2 concentration (Ci) increased; 2, Asian suitable temperature and light conditions water treatment compared to tomato leaves Pn spraying ALA treatment, GS, CE, AQY ΦPSII, qP, Fv '/ Fm', chlorophyll content were improved, Ci, LCP, CCP are reduced. Said the Minya suitable temperature and light conditions in tomato seedlings under Pn main reason for the decline in non-stomatal limitation;, compared with the appropriate temperature and light processing, sub-suitable temperature and light processing tomato malondialdehyde (MDA) content increased, catalase ( activity decreased CAT), superoxide dismutase (SOD) and peroxidase (POD) activity first increased and then reduced. Compared with CK (water treatment), 30 mg · L -1 the ALA pretreatment tomato seedling leaves of Pn, Gs, CE, AQY ΦPSII, qP, Fv '/ Fm' and SOD , POD and CAT activity have improved to varying degrees, Ci, LCP, CCP and MDA content decreased; summer shade 60% of the light intensity by 952μmol · m -2 · s -1 reduced to 263μmol · m -2 · s -1 , and 80% shade and the light intensity by 952μmol · m -2 · s -1 194μmol · m reduced to -2 · s -1 . Shade 60%, 80% of the processing tomato leaves Pn, Gs, CE, AQY, LCP, qP and lower production, Ci, CCP, chlorophyll content, Fv / Fm, Fv '/ Fm' and elevated ΦPSII plants increase in height, stem diameter smaller; 5, sub-appropriate light conditions, foliar application of 0.06 g · m -2 ALA treatment reduced tomato leaves Pn, GS, CE, AQY, LCP , qP and production decrease and Ci, CCP, Fv / Fm, Fv '/ Fm' and ΦPSII, increased range, to further improve the chlorophyll content, but had no significant effect on plant height and stem diameter. 60% shade in summer conditions, foliar application of 0.06 g · m -2 ALA is the most significant mitigation effect of low light.
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