نتایج جستجو برای: anther development
تعداد نتایج: 1416808 فیلتر نتایج به سال:
The genes and pathways AG regulates in late-stage flower development are largely unknown. Several putative downstream genes of AG involved in anther dehiscence were identified, including DAD1, MYB26, OPR3, COI1, and RBR1, through a bioinformatics approach. A 35S::AG-GR inducible line was constructed for timed-induction expression analysis of anther dehiscence versus indehiscence, which revealed...
Anther and pollen development were studied in Olyra humilis Nees, Sucrea monophylla Soderstr, (Bambusoideae), Axonopus aureus P. Beauv., Paspalum polyphyllum Nees ex Trin. (Panicoideae), Eragrostis solida Nees, and Chloris elata Desv. (Chloridoideae). The objective of this study was to characterise, embryologically, these species of subfamilies which are considered basal, intermediate and deriv...
Downregulation of the transcription factor AtMYB103 using transgenic technology results in early tapetal degeneration and pollen aberration during anther development in Arabidopsis thaliana. This paper describes the functional analysis of the AtMYB103 gene in three knock-out mutants. Two male sterile mutants, ms188-1 and ms188-2, were generated by ethyl-methane sulfonate (EMS) mutagenesis. A ma...
BACKGROUND AND AIMS The sexual separation in dioecious species has interested biologists for decades; however, the cellular mechanism leading to unisexuality has been poorly understood. In this study, the cellular changes that lead to male sterility in the functionally dioecious cactus, Opuntia stenopetala, are described. METHODS The spatial and temporal patterns of programmed cell death (PCD...
In flowering plants, the tapetum, the innermost layer of the anther, provides both nutrient and lipid components to developing microspores, pollen grains, and the pollen coat. Though the programmed cell death of the tapetum is one of the most critical and sensitive steps for fertility and is affected by various environmental stresses, its regulatory mechanisms remain mostly unknown. Here we sho...
The tapetum, the innermost of four sporophytic layers in the anther wall, comes in direct contact with the developing male gametophyte and is thought to play a crucial role in the development and maturation of microspores. Here, we report the identification of rice (Oryza sativa) Undeveloped Tapetum1 (Udt1), which is required for the differentiation of secondary parietal cells to mature tapetal...
Jasmonic acid (JA) and its precursor 12-oxophytodienoic acid (OPDA) act as plant growth regulators and mediate responses to environmental cues. To investigate the role of these oxylipins in anther and pollen development, we characterized a T-DNA-tagged, male-sterile mutant of Arabidopsis, opr3. The opr3 mutant plants are sterile but can be rendered fertile by exogenous JA but not by OPDA. Cloni...
Previous studies suggest that exposure to anthers from com, Zea mays L., expressing Bac;/Z%? (Bt)-derived protein may have adverse effects on larvae of the monarch butterfly, Danawa (L.). The objectives of this research were to: 1) measure the effects of short-term and long-term exposure to anthers in the laboratory, 2) examine anther distribution in space and time, 3) measure the effects of lo...
In flowering plants, sink tissues rely on transport of carbohydrates from photosynthetic tissues (sources) for nutrition and energy. However, how sugar partitioning in plants is regulated at the molecular level during development remains unknown. We have isolated and characterized a rice (Oryza sativa) mutant, carbon starved anther (csa), that showed increased sugar contents in leaves and stems...
Cotton (Gossypium spp.) is an important economic crop and there is obvious heterosis in cotton, fertility has played an important role in this heterosis. However, the genes that exhibit critical roles in anther development and fertility are not well understood. Here, we report an acyl-CoA N-acyltransferase (EC2.3; GhACNAT) that plays a key role in anther development and fertility. Suppression o...
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