Paraffin section observation of flower bud differentiation of Chimonanthus praecox in Kunming and comparison of the differentiation processes in different regions, China
Paraffin section observation of flower bud differentiation of Chimonanthus praecox in Kunming and comparison of the differentiation processes in different regions, China
复制标题
昆明腊梅花芽分化石蜡切片观察及国内不同地区分化过程比较
DOI：
10.1016/j.hpj.2021.11.001
复制
发表时间：
2022-03-01
影响因子：
5.7
通讯作者：
Chen, Longqing
中科院分区：
文献类型：
--
作者：
Li, Sijin;Yang, Nan;Chen, Longqing
摘要 腊梅是我国重要的观赏植物和切花材料。它在寒冷的冬天绽放，花朵散发着迷人的香味。然而，不同地区的开花时间有所不同。为了了解Ch.本研究采用石蜡切片法对春城昆明地区的早春花芽分化进行了研究。同时我们比较了不同地区分化过程的差异。研究发现，温度是Ch. Ch. 花芽分化和开花的关键因素。早发。在花芽分化过程中，20℃是诱导花芽由营养腋芽向生殖芽转变以及随后形态分化的最佳温度。早发。此外，在前三个分化期——花被初基期、雄蕊初基期和雌蕊初基期中，昆明由于升温至20℃的速度较快，完成分化的时间最短，而郑州的分化时间最长，这可能是由于升温缓慢所致。 5月后，除昆明外，高温胁迫迫使各地区花芽进入第一个长时间休眠期。昆明平均气温只有20-25℃，花芽继续分化。在各地区中，昆明最早在8月初就完成了整个花芽分化，并且第二次休眠开始的很早，但时间也很长。其他地区的植物休眠时间较短，低温很快打破了休眠状态。相反，昆明的植物在低温下度过的时间较长。因此，低于10℃的低温是打破第二次休眠的关键因素。当然，温度对花芽分化和开花的规律性影响对于Ch.早发。
A B S T R A C T Chimonanthus praecox is an important ornamental plant and cut flower material in China. It blooms in the freezing winter and its flower emits charming fragrance. However, in different region the flowering time is variable. In order to understand the flowering mechanism of Ch. praecox in the winter, we studied the flower bud differentiation in Spring City-Kunming using paraffin sectioning method in the present study. Meanwhile we compared the differentiation process difference from different regions. It was found that the temperature is the key factor for its flower bud differentiation and blossom of Ch. praecox . In the process of bud differentiation, the temperature 20 degrees C was the optimum for inducing changes from vegetative axillary buds to reproductive buds and subsequent morphological differentiation in Ch. praecox . Furthermore in the first three differentiation periods-tepal primordial stage, staminal primordial stage and pistil primordial stage, Kunming took the shortest time to finish the process due to very rapid temperature rise to 20 degrees C, whereas, in Zhengzhou the time for these differentiations was the longest, which may be caused by the slow temperature rise. After May, the high temperature stress forced the flower buds into the first long dormant period in all regions except Kunming. In Kunming, the average temperature was only 20-25 degrees C, so the flower bud continued to differentiate. In all regions, Kunming is the first to complete whole flower bud differentiation even on the early August, and started the second dormancy very early but very long. In the other regions, the plants went through a shorter dormancy and the low temperature broke the dormancy rapidly. Contrarily the plants of Kunming spent a longer period for the low temperature. Thus, the low temperature less than 10 degrees C is a key factor to breaking the second dormancy. Surely the regular effects of temperature on flower bud differentiation and blossom is very helpful for florescence regulation of Ch. praecox .