Effects of Pre-harvest Light Treatments on the Growth and Quality of Basil
In order to regulate the growth,development,and quality of basil(Ocimum basilicum L.)plants,the'purple leaf basil'in artificial climate chamber was used as the test material,different combina-tions of light intensity and photoperiod were set with 224 μmol·m-2·s-1×16 h·d-1,224 μmol·m-2·s-1×24 h·d-1,330 μmol·m-2·s-1×16 h·d-1 in the last 7 days before harvesting.The results showed that compared with the control(224 μmol·m-2·s-1×16 h·d-1),the plant height and stem diameter of basil plants were increased by 19.1%and 20.6%,respectively;the shoot fresh weight,shoot dry weight and root dry weight of basil plants were increased by 26.2%,41.7%,and 115.0%,re-spectively;and the vitamin C content of basil leaves was increased by 47.1%.In addition,the dimension-ality reduction method of principal component analysis was used to analyze each index.The method of comprehensive evaluation was obtained that the treatments with 224 μmol·m-2·s-1×24 h·d-1 and 330 μmol·m-2·s-1×16 h·d-1 were better than the treatment with 224 μmol·m-2·s-1×16 h·d-1,and the comprehensive scores of the basil plants treated with 224 μmol·m-2·s-1×24 h·d-1 ranked first.In conclusion,short-term continuous light before harvesting improves growth and quality of basil plant under fully-controlled environmental conditions.
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