Drought-resistant sweet potato variety rapid breeding method

Abstract

The invention relates to a drought-resistant sweet potato variety rapid breeding method, and relates to the technical field of hybridization breeding. The breeding method comprises the following steps: F1 generation hybrid true seeds are obtained through directional crossing or polycrossing; drought resistance screening and identification are carried out; and rapid propagation and breeding are carried out. According to the invention, the F1 generation true seeds are obtained through the method of directional crossing or polycrossing, such that the probability of a salinity-tolerant variety in the offspring is greatly increased. The salinity-tolerant sweet potato line identification is put to a first round (a technical prejudice is overcome because first-round selection is carried out according to yield and quality level), such that the inclusion of a salinity-tolerant single plant in the hybrid offspring is ensured to a maximal extent, and materials without salinity tolerance is rejected. Therefore, the selected single plants are greatly reduced, and field identification work load is substantially reduced. A remote multi-site yield comparison test can be completed in one time, and breeding time is shortened by 2-3 years. The method also has the advantages of high accuracy, low blindness, and high efficiency.

Description

technical field

[0001] The invention relates to a rapid breeding method for drought-resistant sweet potato varieties, which belongs to the technical field of hybrid breeding. Background technique

[0002] Drought is a major environmental problem worldwide. In the potato area in northern my country, the rainfall is mostly concentrated in mid-July and August, and the early and late stages of sweet potato growth often encounter drought, which limits the increase in sweet potato production. In the early stage of sweet potato growth, sweet potato seedlings are very sensitive to soil moisture conditions. After suffering from drought stress, sweet potato seedlings are prone to die, resulting in lack of seedlings and broken ridges, which seriously affects the yield of sweet potato. Therefore, cultivating drought-tolerant sweet potato varieties is one of the important ways to increase the yield of sweet potato, and plays an important role in the development of sweet potato industry ...

Examples

Embodiment 1

[0028] (1) Hybrid combination configuration

[0029] Using CHGU1.002 with high drought resistance as the female parent and PC94-1 with better drought resistance as the male parent, 3800 F1 generation hybrid seeds were obtained by sexual crossing.

[0030] (2)F 1 Single plant screening of sweet potato

[0031] Sow the obtained 3800 hybrid seeds in vermiculite powder in the greenhouse, strengthen management after emergence, topping to promote branch growth, select 3000 individual plants with healthy growth and development, and select 4 from each individual plant to grow basically the same , 4-5 branches with internode length (about 17cm), respectively carry out tests I and II. Test I (selection method I): 3 branches were implanted into 1 / 2 Hoagland solution (1 / 2 Hoagland solution The composition is shown in Table 5), and Chaoshu No. 1 was implanted at the same time as a control; cultivated under the light intensity of 2000lux, and screened after 5 days to obtain a drought-re...

Embodiment 2

[0044] (1) Hybrid combination configuration

[0045] With Jishu 21, a variety with high drought resistance and excellent quality, as the female parent, and medium / high drought resistance, high-quality, and disease-resistant varieties Red Banana, Yizi 138, and Beauregard as the male parent, 1,500 F1 generation hybrid seeds were obtained through group crossbreeding .

[0046] (2) F 1 Single plant screening of sweet potato

[0047]Sow the 1500 hybrid seeds obtained in the vermiculite powder in the greenhouse, strengthen management after emergence, topping to promote branch growth, select 1000 robust individual plants for production, and select 4 growths from each individual plant that are basically the same, The branches with 4-5 internode lengths (about 15cm) were subjected to Test I and II respectively. Test I (selection method I): 3 branches were implanted into 1 / 2 Hoagland solution with 15% PEG6000 (see Table 5 for the composition of 1 / 2 Hoagland solution) for selection, ...

technical field

[0001] The invention relates to a rapid breeding method for drought-resistant sweet potato varieties, which belongs to the technical field of hybrid breeding. Background technique

[0002] Drought is a major environmental problem worldwide. In the potato area in northern my country, the rainfall is mostly concentrated in mid-July and August, and the early and late stages of sweet potato growth often encounter drought, which limits the increase in sweet potato production. In the early stage of sweet potato growth, sweet potato seedlings are very sensitive to soil moisture conditions. After suffering from drought stress, sweet potato seedlings are prone to die, resulting in lack of seedlings and broken ridges, which seriously affects the yield of sweet potato. Therefore, cultivating drought-tolerant sweet potato varieties is one of the important ways to increase the yield of sweet potato, and plays an important role in the development of sweet potato industry ...

Examples

Embodiment 1

[0028] (1) Hybrid combination configuration

[0029] Using CHGU1.002 with high drought resistance as the female parent and PC94-1 with better drought resistance as the male parent, 3800 F1 generation hybrid seeds were obtained by sexual crossing.

[0030] (2)F 1 Single plant screening of sweet potato

[0031] Sow the obtained 3800 hybrid seeds in vermiculite powder in the greenhouse, strengthen management after emergence, topping to promote branch growth, select 3000 individual plants with healthy growth and development, and select 4 from each individual plant to grow basically the same , 4-5 branches with internode length (about 17cm), respectively carry out tests I and II. Test I (selection method I): 3 branches were implanted into 1 / 2 Hoagland solution (1 / 2 Hoagland solution The composition is shown in Table 5), and Chaoshu No. 1 was implanted at the same time as a control; cultivated under the light intensity of 2000lux, and screened after 5 days to obtain a drought-re...

Embodiment 2

[0044] (1) Hybrid combination configuration

[0045] With Jishu 21, a variety with high drought resistance and excellent quality, as the female parent, and medium / high drought resistance, high-quality, and disease-resistant varieties Red Banana, Yizi 138, and Beauregard as the male parent, 1,500 F1 generation hybrid seeds were obtained through group crossbreeding .

[0046] (2) F 1 Single plant screening of sweet potato

[0047]Sow the 1500 hybrid seeds obtained in the vermiculite powder in the greenhouse, strengthen management after emergence, topping to promote branch growth, select 1000 robust individual plants for production, and select 4 growths from each individual plant that are basically the same, The branches with 4-5 internode lengths (about 15cm) were subjected to Test I and II respectively. Test I (selection method I): 3 branches were implanted into 1 / 2 Hoagland solution with 15% PEG6000 (see Table 5 for the composition of 1 / 2 Hoagland solution) for selection, ...