Abstract
The effects of mutations determinate (det), late flowering (lf), fasciata (fa, fas), and nodulation4 (nod4) on development of inflorescence in pea were characterized. All listed mutations distort functions of stem apical meristem and influence development of axillary flower-bearing axis (short paracladium) leading to formation of terminal flower and bracts. Structure of flower terminating short paracladium was analyzed and hypothesis on origin of its structure was proposed. Scheme of genetic network in control of inflorescence development in pea was designed.
Highlights
Increase of productivity of agriculturally valuable plants is achievable through construction of new morphotypes with altered morphology of shoot, inflorescence and flower
Studies on the basic principles of this control are traditionally carried out using model objects, namely Arabidopsis thaliana (L.) Heynh. (Brassicaceae) and Antirrhinum majus L. (Scrophulariaceae)
Legumes as a whole are characterized by compound inflorescences in which open first order axis is terminated with racemose floral unit; this pattern is repeated in second order axes, short and long (Weberling 1989)
Summary
Increase of productivity of agriculturally valuable plants is achievable through construction of new morphotypes with altered morphology of shoot, inflorescence and flower. In this connection, genetic control of higher plants development represents one of the most interesting problems in both theoretical and applied biology. These objects have some limitations: both species possess simple leaf and inflorescence complicating direct approximation of obtained results on significant part of plant taxa. Many legumes possess so-called truncated double inflorescence, in which main axis growth is not limited and flowers are born on short and long paracladia (Fig. 1A). Pea produces short paracladia with two flowers with axis terminated with sterile residuum («stub» in terms of Singer et al 1990), Fig. 1A, 2E)
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