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| Identification of Welsh Onion （Allium fi stulosum L.）Bolting Character and Preliminary Studies on Its Genetic Character |
| MIAO Jin-shan1，SUN Hu1，LI Yun-ling1，LIU Jie1，SUN Ming-mao1，WANG Ai-li1，JIA Lingpeng2 |
| 1Institute of Horticultural Science and Technology，Weifang College of Science and Technology， Shouguang 262700，Shandong， China； 2Shouguang Dongfangyuyuan Company Co. Ltd.， Shouguang 262700， Shandong， China |
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Abstract Ninety welsh onion（Allium fistulosum L.）germplasms from domestic and abroad and 28 hybrid combinations were applied as experimental materials，comparison between their bolting character were conducted in greenhouse．The results showed that with exception of 1 extremely-earlybolting germplasm，the other 89 germplasms were divided into 3 groups of easy-bolting，mid-tolerant to bolting and tolerant to bolting. They took 41.1%，36.7% and 21.1%，respectively．Compared with the Chinese germplasm，those from Europe and Japan were more tolerant to bolting on the whole.Investigation on bolting characters of these hybrid combinations and parents found that 67.9% of them performed below-low-parent advantage or below-mid-parent advantage and they were all easily bolting．Seven point one percent performed over-high-parent advantage in bolting，but without obvious heterosis．Therefore，only by selecting tolerant to bolting parents or at least one of the parents was tolerant to bolting，we can obtain tolerant to bolting hybrids o f welsh onion.
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Received: 19 December 2012
Published: 09 March 2013
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