This experiment aimed to address the problem of growth inhibition of Avena sativa L. under shading and low light conditions between photovoltaic panels. Using ‘Kona’ oats and plant regulator melatonin （MT） as materials， treatments， including a normal light control （CK-Z）， a shading stress control （CK-F）， and treatments with 20， 40， 60， 80， and 100 mg·L^-1melatonin （MT） sprayed under shade a pot experiment were conducted. The growth and physiological indicators at 30 and 50 days after emergence were measured， and the regulatory effect was evaluated by correlation analysis and membership function. Compared with CK-Z， CK-F significantly reduced oat stem thickness， dry weight， and antioxidant enzyme activity， while increasing plant height， fresh weight， and MDA （Malondialdehyde） content （P<0.05）； Spraying MT could improve its growth physiological indicators， with a significant positive correlation between stem thickness and fresh weight， dry weight， etc. （P<0.01）， a positive correlation between SOD （Superoxide dismutase） and plant height （r=0.075， P<0.05）， and a negative correlation between MDA and dry weight； The membership function indicated that the comprehensive evaluation value （D=0.89） was the highest when treated with 80 mg·L^-1 MT for 50 days. Exogenous MT enhanced the antioxidant system and alleviated shade stress. The optimal combination of 80 mg·L^-1 MT treatment for 50 days provided a solid theoretical basis for improving oat shade tolerance and grass cultivation in photovoltaic areas.

Oats  /  Melatonin  /  Shade conditions  /  Physiological and biochemical