SummaryThe development of the shoot can be divided into a series of distinct developmental phases based on leaf characteristics and in¯orescence architecture. The relationship between phase length, de®ned by the number of organs produced, and the timing of the¯oral induction (V 3 -I 1 transition) is relatively ill de®ned. Characterization of the serrate mutant (CS3257; Arabidopsis Biological Research Center) revealed defects in both vegetative and in¯ores-cence phase lengths, the timing of phase transitions, leaf number, the leaf initiation rate, and phyllotaxy. The timing of¯oral induction, however, is the same as in wild-type in extended short days as well as in short days, whereas the¯owering time response to photoperiod is unaffected. SERRATE is shown to be required for the development of early juvenile leaves (V 1 ) and to promote late juvenile leaf development (V 2 ), while suppressing adult leaf (V 3 ) and in¯orescence development (I 1 and I 2 ). The se mutation supports the hypothesis that the timing of¯oral induction is independent of vegetative and in¯orescence phase lengths. The role of SERRATE in the regulation of phase length and leaf identity is discussed.
3,3‐Dimethyl selenetane has been polymerized under the influence of different cationic and anionic catalysts. Cationic polymerization led to limited conversions because of the occurrence of a termination reaction between the growing chains and the formed polymer. The obtained polymers had low molecular weights. Anionic polymerization gave polymers with molecular weight up to 35,000. The mechanisms of polymerization are believed to be analogous to the mechanisms proposed for the polymerization of thietanes.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.