The caudal end of the embryonic axis consists of the primitive streak and the tail bud. Small fragments of this caudal tissue were transplanted from mouse embryos of various developmental stages to the kidney capsule in order to test their histogenetic capacity. The variety of mature tissues obtained from these small fragments was similar to that obtained by grafting a larger caudal portion of ...

Phytochrome B (phyB) enables plants to modify shoot branching or tillering in response to varying light intensities and ratios of red and far-red light caused by shading and neighbor proximity. Tillering is inhibited in sorghum genotypes that lack phytochrome B (58M, phyB-1) until after floral initiation. The growth of tiller buds in the first leaf axil of wild-type (100M, PHYB) and phyB-1 sorg...

We have performed a time course analysis of the expression of Sonichedgehog (shh) and patched1 (ptc1) in response to exogenous retinoic acid (RA) application to get some insight into the mechanism(s) underlying the formation of a mirror-image duplication of shh and ptc1 domains of expression in the pectoral fin buds of zebrafish. We have shown that RA exposure during the early stages of pectora...

The bud bank of perennial grasses is a controlling factor in population dynamics and estrongly affected by soil water nitrogen status. To explore how the size its components affect shoot density under different moisture contents spring autumn. A three-full-factorial field experiment with factors treatment timing (spring autumn), rate (control 10 g N m−2 yr−1) irrigation +40 mm rainfall) was con...

The shape and diversity of the mammalian molar teeth is suggested to be regulated by the primary and secondary enamel knots, which are putative epithelial signaling centers of the tooth. In search of novel molecules involved in tooth morphogenesis, we analyzed mRNA expression of Slit1, -2 and -3, earlier characterized as secreted signals needed for axonal pathfinding and their two receptors Rob...

Antagonists act to restrict and negatively modulate the activity of secreted signals during progression of embryogenesis. In mouse embryos lacking the extra-cellular BMP antagonist gremlin 1 (Grem1), metanephric development is disrupted at the stage of initiating ureteric bud outgrowth. Treatment of mutant kidney rudiments in culture with recombinant gremlin 1 protein induces additional epithel...

Phytochrome B (phyB) enables plants to modify shoot branching or tillering in response to varying light intensities and ratios of red and far-red light caused by shading and neighbor proximity. Tillering is inhibited in sorghum genotypes that lack phytochrome B (58M, phyB-1) until after floral initiation. The growth of tiller buds in the first leaf axil of wild-type (100M, PHYB) and phyB-1 sorg...

Development of the posterior body (lumbosacral region and tail) in vertebrates is delayed relative to gastrulation. In amniotes, it proceeds with the replacement of the regressed node and primitive streak by a caudal blastema-like mass of mesenchyme known as the tail bud. Despite apparent morphological dissimilarities, recent results suggest that tail development in amniotes is in essence a con...

A yeast class V myosin Myo2 transports the Golgi into the bud during its inheritance. However, the mechanism that links the Golgi to Myo2 is unknown. Here, we report that Ypt11, a Rab GTPase that reportedly interacts with Myo2, binds to Ret2, a subunit of the coatomer complex. When Ypt11 is overproduced, Ret2 and the Golgi markers, Och1 and Sft2, are accumulated in the growing bud and are lost ...