Abstract:

To test the application effect of brassinolide (BR), a field experiment was conducted, and the effects of different concentrations of BR and exogenous calcium on the growth, physiological characteristics, fruit setting and yield of tomato in solar greenhouse were studied. The results showed that: in the experimental concentration range, high concentration of BR treatment inhibited the growth of tomato plant height in the early stage, while the appropriate concentration of BR treatment increased plant height. High concentration of BR increased MDA content and decreased soluble sugar content in tomato leaves. Appropriate concentration of BR treatment could reduce MDA content and relative electrical conductivity of tomato leaves, increase the proline content and soluble sugar content of tomato leaves, and increase the chlorophyll content of tomato. High concentration of BR could inhibit tomato fruit setting and reduce the yield of the first inflorescence, while the appropriate concentration of BR treatment could increase the fruit setting rate of each layer of inflorescence and the yield of tomato. The additive effect of BR combined with exogenous calcium on tomato growth, physiological indexes, fruit setting rate and yield was not obvious. To sum up, the effect of BR combined with exogenous calcium is not significant, and the appropriate concentration of BR could be used alone in the production of overwintering tomato in solar greenhouse to improve the stress resistance and yield of tomato.

Key words: brassinolide, exogenous calcium, solar greenhouse, over-winter tomato, physiological characteristics