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Comparison of Leaf Plastochron Index and Allometric Analyses of Tooth Development in Arabidopsis thaliana
Journal of Plant Growth Regulation ( IF 4.8 ) Pub Date : 2000-03-01 , DOI: 10.1007/s003440000008
Groot 1 , Meicenheimer
Affiliation  

A bstractTwo methods of analyses were used to investigate tooth development in serrate (se) mutant and wild-type Columbia-1 (Col-1) Arabidopsis thaliana leaves. There were almost twice as many teeth with deeper sinuses and two orders of toothing on the margins of serrate compared with Columbia-1 leaves. The main objective of this study was to test three hypotheses relative to the source of polymorphism in tooth development: (i) Teeth share similar growth rates and initial sizes, but the deeper teeth are initiated earlier in leaf development. (ii) Teeth share similar timing of initiation and growth rates, but the deeper teeth have a larger initial size. (iii) Teeth share similar timing of initiation and initial sizes, but the deeper teeth have a faster growth rate. Leaf plastochron index (LPI) was used as the time variable for leaf development. Results showed teeth in se were initiated at −27 LPI, 15 plastochrons earlier than those of Col-1. Serrate leaf expansion was biphasic, with the early phase expanding at half the relative plastochron rate of the later phase, which equaled the constant relative expansion rate of Col-1 leaves. Allometric analyses of tooth development obscured the interactions between time of tooth and leaf initiation and the early phase of leaf expansion characteristic of serrate leaves and teeth. Timing of developmental events that allometric analysis obscured can be readily detected with the LPI as a developmental index.

中文翻译:

拟南芥叶片发育指数与牙齿发育异速生长分析的比较

摘要使用两种分析方法研究锯齿 (se) 突变体和野生型 Columbia-1 (Col-1) 拟南芥叶片的牙齿发育。与 Columbia-1 叶片相比,具有更深鼻窦的牙齿和锯齿边缘的齿数几乎是其两倍。本研究的主要目的是检验与牙齿发育多态性来源相关的三个假设:(i) 牙齿具有相似的生长速率和初始尺寸,但较深的牙齿在叶片发育的早期开始。(ii) 牙齿的萌生时间和生长速度相似,但较深的牙齿具有较大的初始尺寸。(iii) 牙齿的起始时间和初始尺寸相似,但牙齿越深,生长速度越快。叶质体指数(LPI)用作叶发育的时间变量。结果显示 se 中的牙齿在 -27 LPI 时开始,比 Col-1 早 15 个 plastochrons。锯齿叶片扩张是双相的,早期扩张速度是后期相对塑性速率的一半,这等于 Col-1 叶片的恒定相对扩张率。牙齿发育的异速生长分析掩盖了牙齿和叶子开始时间与锯齿叶和牙齿的叶片扩张特征的早期阶段之间的相互作用。异速生长分析掩盖的发育事件的时间可以很容易地用 LPI 作为发育指标来检测。这等于 Col-1 叶片的恒定相对膨胀率。牙齿发育的异速生长分析掩盖了牙齿和叶子开始时间与锯齿叶和牙齿的叶片扩张特征的早期阶段之间的相互作用。异速生长分析掩盖的发育事件的时间可以很容易地用 LPI 作为发育指标来检测。这等于 Col-1 叶片的恒定相对膨胀率。牙齿发育的异速生长分析掩盖了牙齿和叶子开始时间与锯齿叶和牙齿的叶片扩张特征的早期阶段之间的相互作用。异速生长分析掩盖的发育事件的时间可以很容易地用 LPI 作为发育指标来检测。
更新日期:2000-03-01
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