Study on the influence of stimulants on the rooting of the paulownia (paulownia) and tulip (liriodendron tulipifera) trees during the propagation by cuttings

This article describes the effect of a growth stimulant on the rooting of Paulownia and tulip tree saplings in the conditions of the Tashkent region. In addition, the article discusses the method of propagation of sapling from lignified and annual green cuttings, the influence of the preparation of the substrate 3: 3: 1 from sand, klinec (crushed stone), vermicompost on the development of saplings. In this case, the usual water (control), root SP, basfoliar Kel-SL and heteroauxin stimulants were used.

Spathodea campanulata (African tulip tree).

S. campanulata is a medium-size tree up to 35 m tall and 175 cm in diameter. It is indigenous to Africa where it extends along the west coast from Ghana to Angola and inland across the tropical rain forest region to southern Sudan and Uganda. It grows naturally in secondary forests in the high forest zone and in deciduous transition and savanna forests. In Uganda, it is one of the trees that colonizes grasslands. It grows well in areas with an even distribution of rainfall but will tolerate a dry season of up to six months. It grows on a wide variety of sites, from poorly to excessively drained, but prefers fertile, deep and well-drained loams.

Pollination Ecology of Indian Tulip Tree, Thespesia Populnea (L.) Sol. Ex Correa (Malvaceae), a Valuable Evergreen Tree Species for Coastal Ecorestoration

Thespesia populnea is a coastal evergreen tree species which flowers seasonally. The flowers are hermaphroditic, self-compatible, self-pollinating, and principally melittophilous. The fruits are indehiscent, turban-shaped, capsules, which release seeds in tidal water upon the decay of their pericarp. Both fruits and seeds are buoyant and typically hydrochorous. This species is a source of wood, dye, food, traditional medicine, being also used as an ornamental and avenue tree. Therefore, it is important in coastal eco-restoration and carbon sequestration.

Polyploidy as a Management Strategy for Invasive Species

Most invasive species are prolific seed-producing landscape ornamental plants that have been introduced to non-native habitats with limited or no natural controls on their reproduction and spread. Techniques for converting prolific seed-producing landscape ornamentals into sterile or nearly sterile forms are available. Oryzalin and colchicine have been used to double chromosomes, resulting in autotetraploids with reduced fertility and potential parent plants of sterile triploids. Guard cell measurements and flow cytometry have been used to determine ploidy conversion and identify polyploids. Complete sterility has been achieved in three species of shower trees (Cassia sp.), and up to a 95% reduction in seed production has been achieved in royal poinciana (Delonix regia) and african tulip tree (Spathodea campanulata). Monkey pod (Albizia saman) crosses have produced triploid progeny to evaluate for sterility.