| 摘要: |
| 以少侧枝切花菊品种‘深志’为试验材料，研究温度对其侧芽形成的影响。在大田栽培条件下，‘深志’侧芽发生率与环境温度呈负相关；解剖观察表明，其腋生分生组织在春季温度较低时发育成侧芽，而夏季高温时很快演变成无序的薄壁细胞团。在人工控制条件下进一步研究，结果表明：1）‘深志’适温（（日温）25 ℃/（夜温）20 ℃）时可正常形成侧芽，高温（（日温）33 ℃/（夜温）28 ℃）处理16~25 d侧芽形成几乎完全受到抑制，而25 d后新生节位又开始形成侧芽；2）对高温处理期间‘深志’未形成侧芽的节位进行解剖观察，叶腋部位只呈现出无序的薄壁细胞团，与田间高温季节解剖观察结果一致；3）‘深志’适温时茎尖中ZR含量呈缓慢上升趋势，IAA/ZR值基本保持不变，而高温处理期间茎尖中ZR含量先大幅下降后又上升，IAA/ZR值先大幅上升后又下降。综上，温度可能通过影响‘深志’茎尖中ZR含量及IAA/ZR值调控其侧芽的形成。 |
| 关键词: 切花菊 侧芽 温度 解剖 激素 |
| DOI：10.11841/j.issn.1007-4333.2014.01.10 |
| 投稿时间：2013-05-13 |
| 基金项目:国家‘863’计划项目（2011AA100208）；教育部高等学校博士学科点专项科研基金资助课题（博导类）（20110008110021） |
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| Effect of temperature on lateral bud formation of Chrysanthemum morifolium ‘fucashi’ |
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LI Jun-xiang, WEN Chao, LIU Feng-luan, YANG Hui-fang, CHEN Xiao-li, XI Lin, ZHAO Liang-jun
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| (College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China) |
| Abstract: |
| We studied the effect of temperature on lateral bud formation of less-branching Chrysanthemum morifolium‘fucashi’.The results showed that the percentage of lateral bud formation in the new nodes was negatively related to the environmental temperature.Anatomical observation showed that its axillary meristem could develop into lateral bud in cool spring but quickly turned into disordered parenchymatous cells in hot summer.Further research under the controlled condition indicated that‘fucashi’could generate lateral buds all the time under normal temperature condition (day 25 ℃/night 20 ℃).However,the lateral bud formation was almost completely suppressed from the 16th to the 25th day,and then formed again in axils of the new nodes when treated with high temperature (day 33 ℃/night 28 ℃).Anatomical observation of the axils without lateral buds during the period of high temperature treatment showed only disordered parenchymatous cells,which was the same as the anatomical result during hot summer.Under normal temperature condition,ZR content in the shoot tips of‘fucashi’had a slow increasing tendency,but the ratio of IAA/ZR remained almost unchanged.During the period of high temperature treatment,ZR content in the shoot tips of‘fucashi’decreased significantly and then went up slowly.The ratio of IAA/ZR went up sharply and then dropped significantly.In conclusion,our results indicated that temperature regulated the lateral bud formation in‘fucashi’by affecting the content of ZR and the ratio of IAA/ZR in its shoot tips. |
| Key words: cut chrysanthemum lateral bud temperature anatomy hormone |
