Facilities The Cantaloupe New Varieties 'dongfangmi' Cultivation Characteristics Of Their Production Practices To Develop

Two new Hami melon (Cucumis melo) varieties, i.e. Dongfangmi No.1 and Dongfangmi No.2, and their control varieties, i.e. 'Xuelihong' and 'Xianguo', were used as plant materials in the present study. Comparisons on fruit quality, resistance to fusaric acid, NaCl, low temperature and weak light between the new varieties and their own control as well as SSR marker assisted parental identification of 'Dongfangmi No.2' were carried out. The main results were summarized as folio wings:The development of Hami melon fruit showed a classic S dynamic growth pattern with TSS and total sugar content in fruit increased with the growth of fruit. Changes in titratable acidity during fruit development showed a one-peak pattern. The two new varieties had higher concentration of TSS, fructose, glucose, sucrose and total sugar than those in their own control variety, which suggested that Dongfangmi No. 1 and Dongfangmi No.2 had better fruit quality.Fusaric acid (FA) stongly inhibited the growth of the radicle in all melon varieties tested and such inhibition showed a concentration effect. High concerntration of FA hurt the melon radicle and seedlings to different degrees among different varieties. Young melon plants showed significant injury symptom 7 d after fusaric acid treatment. Dongfangmi No.1 and Dongfangmi No.2, especially Dongfangmi No.1, had higher resistance to blight than did the control varieties.NaCl at low concentration showed promotion effect on the growth of melon radicle, while it showed significant effect at higher concentration. Young melon plants showed significant injury symptom 5 d after high concentration NaCl treatment and the symptoms varied among different varieties. Saline soil influenced seedlings numbers and the normal seedling numbers. Dongfangmi No.1 and Dongfangmi No.2, especially Dongfangmi No.1, had higher resistance to NaCl than did the control varieties.Seed germination and the average length of radicle of the new Hami melon varieties under low temperature and low light were better than those of controls, respectively. The chlorophyll a (Ca)and chlorophyll b (Cb) concentrations and the total chlorophyll concentration decreased significantly under low temperature, but the Ca/Cb ratio increased. Dongfangmi No.1 and Dongfangmi No.2 showed better resistance to low temperature and weak light than did the control varieties.Dongfangmi No.1 and Dongfangmi No.2 also shwoed better storability with long shelf life of more than 2 weeks at high temperature in the summer.The results of SSR marker assisted parental identification of 'Dongfangmi No.2' showed that the outcrossing purification of Dongfangmi No.2 was 100%, which consisted with the result obtained from the field planting.Based on the results above, an operating procedure of cultivation of pollution-free melon fruit was established, including three key control techniques. Results of the present study will play an important role in the cultivation and production of Hami melon of new varieties.