The Role of TFL1 Orthologs in Determining of Plant Architectonics
- PDF / 910,304 Bytes
- 15 Pages / 612 x 792 pts (letter) Page_size
- 8 Downloads / 169 Views
EWS AND THEORETICAL ARTICLES
The Role of TFL1 Orthologs in Determining of Plant Architectonics E. A. Krylova* Federal Research Center Vavilov All-Russian Institute of Plant Genetic Resources, St. Petersburg, 190000 Russia *e-mail: [email protected] Received May 7, 2020; revised June 3, 2020; accepted June 17, 2020
Abstract—One of the most important traits in plant domestication and breeding is the stem growth habit, which can be determinate (terminated) or indeterminate (not terminated). Some taxa have a semideterminate stem growth habit. In different crops preference can be given to cultivars with different stem growth habits. Because of this, among angiosperms for this trait, pronounced homologous series in hereditary variability are observed. The review considers molecular genetic mechanisms controlling the stem growth habit in dicotyledonous and monocotyledonous plants, which underlie phenotypic variation. Data on the known homologs of the Arabidopsis TFL1 gene are presented. Comparison of modern data on the genetic control of stem growth habit in the representatives of different taxa of angiosperms points to the evolutionary conservation of molecular genetic mechanisms controlling the initiation of flowering, as well as to the conserved functionality of the genes involved in this process. Keywords: stem growth habit, TFL1, CEN, SP, the law of homologous series in hereditary variation DOI: 10.1134/S1022795420110058
INTRODUCTION Cultivated plant species differ from their wild relatives in a suite of features, the complex of which is called the “domestication syndrome” [1]. During the breeding considerable changes took place in plant architectonics directly associated with stem growth habit. There are two main types of stem growth habit, indeterminate and determinate. In plants with an indeterminate (not terminated) stem growth habit, the apical meristem of the shoot preserves its proliferative activity throughout the life of the plant, while floral meristems are formed at the periphery of the apical meristem. These plants are characterized by indeterminate inflorescence. Plants with determinate (terminated) type of stem growth habit are characterized by the reproductive transition with the formation of welldeveloped terminal inflorescence (determinate), and stem growth is limited. This type of stem growth habit is considered as one of the most important feature of the “domestication syndrome” of dicotyledonous plants. Stem growth habit is a domestication-related feature directly associated with the plant growth in length, yield, and flowering duration. During growing of many crops (for example, tomato, common bean, soybean, etc.), preference is given to cultivars with determinate stem growth habit. These plants are characterized by compact bush shape, that is convenient for mechanized cultivation and subsequent harvesting. The variation observed for this trait at the phenotypic level forms homologous series in different taxa in full agreement with the law of homologous series in hered-
itary variation, formu
Data Loading...
