Abstract:

In this study, six-year-old Ningqi Ⅶ wolfberry (Lycium bararum) plants under the normal management were used as test materials. Four plant immune inducers, i. e., acetylsalicylic acid (ASA), methyl jasmonate (MeJA), β-aminobutyric acid (BABA), amino oligosaccharide (AOS) were sprayed on the plant as treatments, and the fungicide and water were used as controls. The changes of fruit yield, weight loss rate, natural infection rate, active oxygen metabolism and phenylpropane metabolism of Ningqi Ⅶ were measured, to explore the effects of spraying different plant immune inducers on the fruit yield, disease resistance and storage ability of Ningqi Ⅶ. The results showed that spraying four kinds of plant immune inducers on the leaves before fruit harvest could induce varied disease resistance of Ningqi Ⅶ. Compared with the fungicide control and water control, 1 mg·mL^-1 BABA exhibited the best immune induction effect. With induction by 1 mg·mL^-1 BABA, the activities of superoxide dismutase (SOD), peroxidase (POD) and phenylalanineammonialyase (PAL) were significantly (P<0.05) increased on the 21^st day, the accumulation of secondary metabolites (total phenols and flavonoids) were significantly promoted on the 28^th day, and the fruit yield was significantly enhanced on the 14^th, 21^st, 28^th day. Therefore, 1 mg·mL^-1 BABA could be sprayed per 7 days and five times continuously from the young fruit stage of wolfberry, and the induction of 21 days could improve the disease resistance and effectively enhance the fruit storage capacity of Ningqi Ⅶ.

Key words: plant immune inducers, wolfberry, yield, disease resistance, storage capacity