TITLE	Allometrical growth of the quantitative characters of plants II. The inheritance of plant leaf shape and leaf size of tobacco
AUTHOR	Hong-Pang Wu Institute of Botany, Academia Sinica, Taipei, Taiwan 115, Republic of China
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ABSTRACT	In this paper, six generation means of tobacco (Nicotiana tobacum) were used to study the genetic mechanism of leaf size and shape by the method of generation mean analysis. Four models were considered to establish a suitable one, namely: (1) a three-parameter genetic model (Model 1), (2) a six-parameter digenic interaction genetic model (Model 2), (3) a six-parameter synthetical genetic model (Model 3), and (4) a twelve-parameter synthetical genetic model (Model 4). The data collected from six generations measuring three leaf positions and six growth periods of tobacco leaf shape index and leaf area were used for analysis. The results showed that additive and dominant gene effects, epistasis, and their interactions with growth time (Model 4) are adequate to illustrate the inheritance of leaf shape. Elongated leaf type is dominant over oval leaf type; top leaf has more variability of leaf shape than middle and lower leaves; dominant effect is negative and more influential than additive effect; additive, dominant and digenic interaction effects may change during growth. The additive-dominant model (Model 1) may be used to illustrate the genetic mechanism of leaf size in the third or fourth growth period for different leaf positions. Additive gene is negative and important to the leaf area. Dominant effect either has positive or negative value depending upon the leaf position. Small leaf size is dominant in top and lower leaves, but large leaf size is dominant in the middle leaves. It is still difficult to resolve the genetic mechanism of leaf size by these models.
KEYWORD	Genetic analysis; Leaf shape; Leaf size; Quantitative character; Tobacco;
ARTICLE INFO	Botanical Bulletin of Academia Sinica, Volume 38 Number 3 July 1997, page 205-214, 10 pages
PUBLISHER	Institute of Plant and Microbial Biology, Academia Sinica, Taipei, Taiwan, Republic of China