A microsporogenesis analysis performed in several Citrus populations revealed the presence of cytomixis (i.e., chromatin migration between meiocytes) in pollen mother cells of diploid and tetraploid genotypes. Single and double chromatin bridges between adjacent meiocytes were mainly observed at prophase I, but also in the subsequent phases of first division and in the second meiotic division. ...

Effect of salinity on pollen viability, germination and yield was investigated on 8 canola cvs. Dunkled, Canola-III, Oscar, Ganyou-5, Ganyou-2, Rainbow, Abasin-95 and Westar. Plants were irrigated with non saline, 0.2% (E.C 2.5 dS.m). 0.4% (E.C 4.5 dS.m) and 0.6% (6.5 dS.m) of sea salt concentrations. Plant growth on vegetative as well as reproductive phases was proportionately inhibited with r...

Cassava periclinal cytochimeras, cultivars, and interspecific hybrid and polyploid types were studied in relation to embryonic, cytogenetic, and anatomical behavior. Their apical shoots, pollen grains, male and female buds, roots, stomata, and flowering period were analyzed. Chimeras exhibited increased size of L1 and L2 cells. Polyploidy led to enlargement of stomata in chimeras whereas L2 gav...

BACKGROUND AND AIMS Oxalis debilis is a South American tristylous species that is currently naturalizing in China. Based on field observations and herbarium data a report is made on its pollination, morph frequencies, pollen viability, seed set and chromosome number. In addition, a new chromosome count for the species in Africa is provided. METHODS Field observations were conducted in six pro...

The genus Mesosetum is a primarily South American genus with 42 species. Mesosetum chaseae, regionally known as 'grama-do-cerrado', is abundant in the Pantanal Matogrossense (Brazil); it is a valuable resource for livestock and for environmental conservation. We collected specimens from the Nhecolandia sub-region of the Brazilian Pantanal, located in Corumbá, Mato Grosso do Sul, Brazil. We...

In maize (Zea mays L.) large decreases in kernel number result when low water potentials (Psi(w)) and high temperatures occur during pollination. To gain insight into the basis for the decreased seed set, silk, pollen, and ear-leaf Psi(w), the capability for silk osmotic adjustment, and pollen appearance were measured to determine their relationship to seed set. A multiple-eared or prolific (hi...

Doubled haploid technology has been used by various private companies. However, information regarding chromosome duplication methodologies, particularly those concerning techniques used to identify duplication in cells, is limited. Thus, we analyzed and characterized artificially doubled haploids using microsatellites molecular markers, pollen viability, and flow cytometry techniques. Evaluated...

A study was conducted to investigate the effect of different storage periods and temperatures on pollen viability in vitro vivo plum genotypes ‘Valerija’, ‘?a?anska Lepotica’ ‘Valjevka’. In tested at day 0 (fresh dry pollen) after 3, 6, 9 12 months four (4, ?20, ?80 ?196 °C), distinct temperatures. germination fluorescein diacetate (FDA) staining methods were used test viability, while aniline ...

In this study, the characteristics of tetraploid and diploid watermelon’s flowers, fruits, seeds were examined, their differences investigated. As plant material, ST101 ST82; WL92, WL124, WL134, WL216, WL259-B WL235 used. Flower (pollen viability, pollen germination, number anthers per anther flower); fruit (weight, length, diameter, rind thickness TSS) seed (weight 1000 seed, width, thickness,...