Quantitative Classification of the Morphological Traits of Ray Florets in Large-flowered Chrysanthemum
Quantitative Classification of the Morphological Traits of Ray Florets in Large-flowered Chrysanthemum
复制标题
大花菊舌状花形态性状的定量分类
DOI：
10.21273/hortsci13069-18
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发表时间：
2018-09-01
期刊：
影响因子：
1.9
通讯作者：
Dai, Silan
中科院分区：
文献类型：
--
作者：
Song, Xuebin;Gao, Kang;Dai, Silan
中国大花菊花是形态最复杂的观赏植物之一，其鉴定和分类需要一个明确的、可重复使用的系统。头状花序的多样性主要是由多种形状的射线小花决定的。然而，现有的射线花类型分类系统并不完整和不系统。本研究从中国的151个大花菊花品种中选取299个小花及其相关的12个性状进行数量分类。首先，将花冠管合并度(CTMD)定义为花冠管长度/射线花长度(CTL/RFL)，作为衡量射线花形状的重要指标。结合概率分级和线性回归分析，CTMD分为平坦型、勺型和管状型，CTL/RFL分别为0~0.20、0.20~0.60和0.60~1.00。其次，Q型聚类分析表明，根据射线小花中的其他重要变量，每一类可进一步划分为三种类型(直型、曲型和非典型型)。最后将射线小花分为平直、平曲、平非典型、勺直、勺曲、勺形、管状等9种类型。该系统对菊花头状花序的形态分类具有重要意义，对菊花品种的鉴定、选育和国际标准化具有重要意义。
The large-flowered Chinese chrysanthemum is one of the most morphologically complex ornamental plants, and its identification and classification requires a well-defined and reproducible system. The diversity of the capitulum is determined mainly by multiple shapes of ray florets. However, the existing classification systems for ray floret types are incomplete and unsystematic. In this study, 299 ray florets from 151 large-flowered chrysanthemum varieties in China, as well as 12 related traits of ray florets, were selected for quantitative classification. First, as one of the most important indices of ray floret shape, the corolla tube merged degree (CTMD) was defined as the corolla tube length/ray floret length (CTL/RFL). Combined with a probability grading method and linear regression analysis, the CTMD was divided into three groups, flat, spoon, and tubular, of which the CTL/RFL ranged from 0 to 0.20, 0.20 to 0.60, and 0.60 to 1.00, respectively. Second, Q-mode cluster analysis indicated that each group could be further categorized into three types (straight, curved, and atypical), based on other important variables in the ray floret. Finally, the ray floret was classified into nine types, including flat-straight, flat-curve, flat-atypical, spoon-straight, spoon-curve, spoon-atypical, tubular-straight, tubular-curve, and tubular-atypical. This ray floret classification system will be valuable in the classification of capitulum shape and has significance for the identification, breeding, and international standardization of chrysanthemum cultivars.