Genetics and plant evolution

Warning message

Node revision 1465 not found in node Microevolution of elements productivity of shoot spring soft wheat of the saratov selection. Perharps it was deleted.

Microevolution of elements productivity of shoot spring soft wheat of the saratov selection

The structure of elements of efficiency of runaway of summer soft wheat of the different grades created from the beginning of the XX-th century is analysed. Various tendencies in development of length of a stalk, number of spikelets and kernels an ear, weight kernels are revealed.

The quality of pollen and cytoembryological signs of gametophytic apomixis in the populations of Chondrilla l. species the Lower Volga region

It is shown that the plants of the five investigated species (C. juncea, C. graminea, C. ca-nescens, C. brevirostris, C. latifolia) are characterized by a high degree of defectiveness of pollen (60–80%) and the presence of cytoembryological marker signs gametophytic atomixis. This indicates a high probability of their ability to seed reproduction by apomixis. It is established that the frequency of detection of these signs varies significantly among years and between-population level. It is revealed that C.

Cytoembryological studying of triploid plants of maize

Structure peculiarity of embryo sacs and pollen of hybrid triploid plants in maize was investigated. It is shown first of all that triploid level of the studied plants is the bottom of abnormal gametophytes development. It is supposed that some specific changes can be caused by present of the parthenogenetic line AT-1 genome. This line was used as a pollinator by triploid plants creating.

Pollen-ovule ratios in cereals with different mode of reproduction

The article presents the results of studying of pollen-ovules ratios (P/O), the quality and size of the pollen in wild cereals with different mode of reproduction (sexual: Alopecurus pratensis L., Elymus caninus L., Glyceria fluitans (L.) R. Br., Poa annua L., Zerna riparia (Rehm.) Nevski; facultative apomict: Dactilis glomerata L., Koeleria cristata (L.) Pers., Festuca valesiaca Schleich.

Mature embryo culture diploid and tetraploid forms of maize

The results of the culture of mature embryos of diploid and tetraploid forms of maize are presented. The 9 variants of culture medium with different amounts of 2,4-D and sucrose are tested. The possibility of creating morphogenic callus strains from donors with a predisposition to parthenogenesis in vivo.


Features of the introduction of two Tamarix species to the culture in vitro

The parameters for introduction in in vitro culture of Tamatix laxa and T. ramosissima, including sterilization method, mineral and hormonal composition of the medium used, are defined. It is proved that the most efficient method of sterilization (the percentage of viable explants is over 60%) is the treatment with soap solution, 70% ethanol, 10% Belizna detergent, 5% solution of Lizoformin-2000 detergent and subsequent washing with sterile distilled water three times. The lower concentration of sterilizing agents improves the material sterilization.

Introduction to in vitro culture of Scutellaria baicalensis

The article presents the initial stages of propagation in vitro of medicinal plant species of Scutellaria baicalensis. The scheme of disinfection of seeds, allowing to obtain 67,2% of viable explants, is proposed. The nutrient medium that allows for shoot formation with the ratio of multiplication at 10,2, was selected.

The Cytoembryological Research of Apomixis Frequency of Chondrilla spesies of Europen Part of Russia

As a result of cytoembryological analysis of megagametophytes of Chondrilla it was found out, that the plants of six species examined (C. juncea, C. graminea, C. canescens, C. brevirostris, C. latifolia and C. acantholepis) are characterised by the ability for seed reproduction by apomixis. It was discoverd that the frequency of disclosure of cytoembryological signs of apomixis considerably varies year by year and on the interpopulation level. C.

The effect of photoperiod on the manifestation of apomixis in Poa pratensis L.

The article presents the results of study the effect of the light day duration on the embryological features of apomixis in Poa pratensis L. (Poaceae). The plants were grown under different day length (15 (control), 10 and 24 hours). The some embryological characteristics (frequency of ovules with a few embryo sacs, frequency of the parthenogenetic proembryo and a frequency and range of the gametophyte anomalies) were analyzed.