Abstract:

Flesh scallion disease is a physiological disease with a high incidence rate on Myrica rubra, which has a great impact on yield and fruit quality at maturity, and its pathogenesis has not been reported yet. This study used 15-year Dongkui as the test material, selected 2 experimental points for sampling and investigation, and systematically analyzed the changes in nutrient content in the fruits and leaves of Myrica rubra at different disease levels of flesh scallion disease. With the increase of the onset level of flesh scallion disease (level 0-3), the content of N, K, Mg, Fe in fruits and Ca, Fe, B in leaves increased gradually, and the increase of N and K content in fruits was more significant, and the content reached 15.6 g·kg^-1 and 19.2 g·kg^-1 in the most serious level 3, respectively. The increase of Ca and Fe content in leaves was more significant, reaching 8 825.0 mg·kg^-1 and 181.4 mg·kg^-1, respectively, in the onset level 3, while the P content in leaves showed a gradual decreasing trend with the increase of the onset level, and the content was 0.31 g·kg^-1 at the onset level 3. The malondialdehyde content in the pulp was the highest of 124.2 μg·g^-1 at disease level 0, and the proline content tended to increase gradually with disease level and the difference was significant, reaching 119.1 μg·g^-1 at disease level 3. To sum up, this study preliminarily explored the pathogenesis of Myrica rubra cv. Dongkui by dividing the disease incidence level, and analyzing the differences of nutrient elements in corresponding fruits and leaves.

Key words: Myrica rubra, flesh scallion disease, nutrient elements, disease level