不同春化天数对不同品系大白菜抽薹开花的影响

o understand the mechanisms underlying the floral development in Chinese cabbage, four inbred lines '3#', '7#', '8#' and '9#' were used in this study. The seedlings of these lines were treated at 4 ℃ for 10 d, 20 d and 30 d respectively. The state of flower bud differentiation, bolting and blossom in different lines were observed in order to study the effects of different vernalization days on blossoming in Chinese cabbage. The results showed that the initiation period of flower bud differentiation, bolting and blossom were in advance with the extension of treatment time, and the number of leaves during the stage of flower bud differentiation and bolting were reduced. After cold treatment for 30 d, '3#' and '7#' can be full blossom, 28.6% of the '8#' plants can bolt but did not blossom, '9#' can only completed the flower bud differentiation but failed to bolt. The results suggested that the winterness difference of these lines was significant, the winterness of '9#' was the strongest, '8#' was somewhat weaker, and '3#' and '7#' were weakest. In the research of mechanisms underlying the floral development '3#'and'7#' can be used, and the treatment time under low temperature for promoting flowering was 20 d, while '9#' can be used for a comparative research, however the treatment time was 30 d at least.?????