апомиксис

Апомиксис у Agrostis alba L.

В статье представлены результаты цитоэмбриологического исследования дикорастущей популяции Agrostis alba L. из Саратовской области. Установлено, что растения данной популяции характеризуются апомиктичным способом репродукции в форме диплоспории Taraxacum-типа и псевдогамии.

Распространение гаметофитного апомиксиса у представителей семейства Asteraceae во флоре Юга России

Authors: Kochanova I. S., Lisitzkaya N. M., Kashin A. S., Kirillova I. M., Polyanskaya M. V.

В ходе исследования семенной продуктивности при беспыльцевом режиме цветения в 34 естественных популяциях 30 видов 23 родов семейства Asteraceae Юго- Восточной России гаметофитный апомиксис обнаружен в популяциях 5 видов 5 родов. При этом для Artemisia salsoloides данный способ размножения отмечен впервые.

Изучение размеров и морфологии пыльцы у кукурузы и Tripsacum dactyloides L.

Authors: Apanasova N. V.

Исследовались размеры и морфология пыльцы в связи с проблемой партеногенеза у кукурузы и его апомиктичного сородича трипсакума. Установлено, что диагностика партеногенеза у кукурузы и трипсакума по размерам и степени дефектности пыльцы затруднительна или даже невозможна.

The peculiarities of seeded reprodaction of some species of Salicaceae family

Authors: Ugolnikova E. V.

During the cytoembriological investigation and the research of seed productivity of the species of Sаlicaceae family, growing in the different areas of Saratov region the ability of gametophyte apomixic was found out in 5 populations of 5 species of willows. This way of seeded reproduction of Sаlicaceae family was noticed for the ﬁrst time.

The distribution of gametophytic apomixis among the Asteraceae spesies from European part of Russia

Authors: Kochanova I. S., Lisitzkaya N. M., Kashin A. S.

In a course of investigation of seed productivity under the pollenless regime of ﬂowering and cytogenetic investigation in 250 natural populations of 167 species of 62 the Asteraceae genera from European part of Russia gametophytic apomixis has been discovered in populations of 37 species from 20 genera. For the ﬁrst time this mode of reproduction has been revealed in 26 species from 10 genera.

Research of gametophyte apomixic frequency of Fabaceae family species of Saratov region

Authors: Ermolaeva N. N., Kashin A. S.

During the cytoembriological investigation of the species of Fabaceae family, growing in the different areas of Saratov region the ability of gametophyte apomixic was found out of 4 species of Fabaceae. This way of reproduction of Fabaceae family was noticed for the ﬁrst time.

Apomictic species in genus Hierochloё R. Br.

Authors: Yudakova O. I.

The article is dedicated to cytoembryology investigation of two cereals species: HierochO glabra (two populations from Kamchatka) and H. repens (one population from Lower Volga region). The plants of these populations are characterized by high frequency of ovules with few (2-4) megagametophytes (5,7; 8,6 и 25%, respectively). This point to the apoarhespory - development of unreduced embryo sacs from somatic nucellus cells.

Aposporiy in representatives of the genus Koeleria Pers.

Authors: Yudakova O. I., Kaybeleva E. I.

The article presents the results of cytoembryological analysis of two cereal species: Koeleria cristata (L.) Pers. и K. sabuletorum (Domin) Klok. It was found that in the plants of both species many ovules (23 and 30%, respectively) contain from 2 to 5 megagametophytes. In the ovules the multiple embryo sacs were on the same or different development stage. In the nuccelus of some ovules near the embryo sac the big cells could also be observed. The morphology of these cells liked to initial cells of aposporous embryo sacs.

Pollen-ovule ratios in cereals with different mode of reproduction

Authors: Kaybeleva E. I., Yudakova O. I.

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.

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

Authors: Kaybeleva E. I., Kurennaya T. E., Yudakova O. I.

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.