Anther Ontogeny and Microsporogenesis in <i>Helianthus annuus</i> L. (Compositae)

Variation in Heliopsis Helianthoides (L.) Sweet (Compositae)

The genus Gnaphalium L. (Compositae): phytochemical and pharmacological characteristics.

The genus Gnaphalium, a herb distributed worldwide, comprises approximately 200 species of the Compositae (Asteraceae) family that belongs to the tribe Gnaphalieae. Some species are traditionally used as wild vegetables and in folk medicine. This review focuses on the phytochemical investigations and biological studies of plants from the genus Gnaphalium over the past few decades. More than 125...

Colchicine induced embryogenesis and doubled haploid production in maize (Zea mays L.) anther culture

This study involves in vitro androgenesis of <sp...

Erythropoiesis and haemoglobin ontogeny in the turtle Emys orbicularis L.

The erythropoietic sites and developmental patterns of haemoglobins have been investigated during ontogeny of Emys orbicularis. The yolk-sac blood islands seem to be the unique erythropoietic site during most of embryonic life. Bone marrow haemopoiesis is first observed in young turtles aged one year. The cortical haemopoietic layer of the liver appears involved mainly in granulopoiesis. There ...

Microtubule Patterns and Organelles during Microsporogenesis in Apomictic Chondrilla Juncea L

This study investigated patterns of cytoskeletal organization during microsporogenesis in Chondrilla juncea L., an autonomous apomict with a triploid chromosome number (2n = 15). The distribution of microtubules and organelles is not typical. The microtubules do not form a normal phragmoplast and consequently the organelle equatorial plate observed in many taxons is not present. The organelles ...