Research Progress on Bolting and Flowering Characteristics of Cruciferous Vegetables

There are many varieties of vegetables in Cruciferae,which have a wide distribution and occupy an important position in the global vegetable industry.The bolting period is a crucial stage in the growth cycle of cruciferous plants,which directly affects the yield and quality of vegetable crops.This paper summarized the research progress on the physiological and biochemical characteristics,molecular genetic mechanisms and molecular markers of the flowering and bolting traits in cruciferous vegetables,in order to provide new ideas for revealing the regulatory mechanisms of flowering and bolting in cruciferous vegetables and to provide reference for the breeding of new varieties of cruciferous vegetables that are resistant to flowering.

Breeding of A New Cucumber Variety ‘Lvyou No.1＇

‘Lvyou No. 1＇,bred in Huasheng Agriculture Limited Liability Company of Shandong Province,is a new cucumber F1 hybrid developed by crossing two inbred lines HS267014 and HS6201. It is an early-maturing variety with wide adaptability,high yield,and good commercial breeding. The plant has strong growth vigor and high resistance to white powder mildew. The first fruit sets on the 4 ^th-5^ th section,and the fruiting ratio of cucumber is 60%-80%. The cylindrical fruit is about 30-35 cm in length,3. 2-3. 5 cm in diameter with light green skin and glossy appearance. This plant has demonstrated adaptability in early-spring and late-autumn planting as well as spring and autumn tunnel planting.

Breeding of a New Fruit Radish Variety"Sheng Qing Yi Hao"

"Sheng Qing Yi Hao",a new fruit radish F1 hybrid,which was bred from HSR54 A,a self-bred sterile line,and HS1356,an excellent male parent.The flesh of the roots is emerald green,delicate,sweet and crisp.The skin of the roots is little spicy.It takes about 70 d from sowing to maturity.The fleshy roots have a length of 22-27 cm,a diameter of 6-8 cm,and a root weight of 0.8-1.1 kg.The F1 hybrid has stronger resistance to soft rot disease in the field the control group‘Chengyangqing’.It is suitable for cultivation in greenhouse in spring and open field in autumn in north China.

Effects of Low Temperature Treatment on Bolting of Radish(Raphanus sativus L.)

[Objectives]This study was conducted to screen out a vernalization method of radish that is more suitable for breeding and hybrid production.[Methods]Eight radish inbred lines with different bolting tolerance were used as the research objects for the experiment.The following three treatments were done:(1)treating at 4℃in the dark with heat preservation for 1,2,3,4,and 5 weeks,respectively~([1]),(2)treating at 4℃in the dark with heat preservation for 3 weeks after 24 h incubation in light at 20℃,and(3)treating under light at a low temperature of 6.5℃for three weeks after cultivating under light at 20℃to 4 true leaves.The effects of low temperature treatment on the bolting and flowering time of different varieties of radish treated at different developmental stages were analyzed.[Results]When comparing these three methods,the low-temperature treatment of wet seeds had a better effect on early bolting of radish and is simpler and more feasible.The effect of treating four-leaf seedlings at 6.5℃was the worst;most radish inbred lines could shorten bolting time when treated at 4℃for one week;and within a certain range,the longer the 4℃treatment time,the better the vernalization effect.Different radish inbred lines had different performances to low temperature treatment.[Conclusions]This study provides a scientific basis for the theoretical research on vernalization of radish.