Barely Significant

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Based on the above results, we speculate that CCC induced tomato resistance to TYLCD may be realised through the following two ways: 1 in previous studies, CCC was often used to cultivate strong seedlings in industrial seedling raising, indicating that although CCC delayed the growth of plants to a certain extent, the photosynthetic related indexes, chlorophyll content and stem diameter of plants showed an increasing trend, thus improving the resistance of plants to external adversity; 2 we found that after spraying CCC, the level of JA in tomato could be increased, and JA was one of the important signals of ISR-mediated pathway.
Although the fresh-to-dry ratio displayed a negative trend, it did not reach statistical significance, indicating that dry matter accumulation efficiency is governed by other regulatory pathways.
For both varieties, the endogenous ABA content showed a decreasing trend over time following the application of exogenous GA 3 and IAA, reaching the highest level after 5 days, significantly higher than at other times ( p < 0.05).For both ‘Xinmu No. 4’ and ‘Saiwo’, under the treatment with exogenous growth regulators GA 3 and IAA, the endogenous ABA content in the crown buds decreased with increasing concentrations.