Cytoplasmic male sterility has been found independently in soybean three times since 1995, but no microscopic investigation has been published. The purpose of this microscopic study was to establish the developmental sequence leading to sterility in a cytoplasmic male-sterile soybean line that has been found to be stable under all environmental conditions tested and to demarcate the temporal and spatial parameters that result in degeneration of the microspores and pollen grains. Light microscopy showed an abnormal development and/or premature degeneration of the tapetum after meiosis II, but some pollen grains persisted until after microspore mitosis. The pollen grains never completely filled with reserves. Premature formation of the endothecium also was evident. Histochemical staining for water-insoluble carbohydrates revealed an abnormal pattern of starch deposition in anther walls that coincided with lack of pollen filling. Electron microscopy showed degeneration of the inner mitochondrial membrane in the tapetal cells as the first detectable change leading to cell degeneration. Subsequently, the tapetal endoplasmic reticulum exhibited atypical concentric rings. Pollen grains displayed mitochondria with unusually enlarged inner mitochondrial spaces, degraded plastids, a rudimentary intine, and no starch or lipid reserves. Results link mitochondrial degeneration, premature formation of the endothecium, and energy deprivation to male sterility.
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http://dx.doi.org/10.3732/ajb.89.3.417 | DOI Listing |
Sci Rep
December 2024
Center of Excellence in Bioconversion and Bioseparation for Platform Chemical Production, Institute of Biotechnology and Genetic Engineering, Chulalongkorn University, 254 Phayathai Road, Pathumwan, Bangkok, 10330, Thailand.
One important functional food ingredient today, valued for its health properties and ability to prevent disease, is bee pollen, which comprises a combination of nectar, pollen from plants, and the secretions of bees. In this research, the tyrosinase (TYR) inhibiting abilities of the peptides derived from bee pollen protein hydrolysates are investigated. Various proteases were utilized to generate these peptides, followed by testing at different concentrations.
View Article and Find Full Text PDFCurr Issues Mol Biol
December 2024
College of Food Science and Engineering, Boda College of Jilin Normal University, Siping 136000, China.
As a globally significant economic crop, the seed size of soybean ( [L.] Merr.) is jointly regulated by internal genetic factors and external environmental signals.
View Article and Find Full Text PDFDiscov Med
December 2024
Cell Cycle, Stem Cell Fate and Cancer Laboratory, Institute for Research Marqués de Valdecilla (IDIVAL), 39011 Santander, Spain.
Invasive alien plant species (IAPS) are well known to disrupt biodiversity, natural ecosystems, and infrastructures, resulting in a significant worldwide economic cost. However, the impact of IAPS on human health has been generally disregarded, despite a significant potential risk. Currently, due to new evidence and the concept of , this concern is gaining strength.
View Article and Find Full Text PDFJ Asthma
December 2024
Department of Otorhinolaryngology & Clinical Allergy Center, The First Affiliated Hospital, Nanjing Medical University, Nanjing, China.
Background: Thunderstorm Asthma (TA) events are observed worldwide, but the precise triggering mechanisms remain elusive.
Objective: This study aims to outline the environmental patterns associated with TA events in China.
Methods: Environmental data was collected from Chinese cities that have experienced TA events, focusing on meteorological conditions in the seven days preceding the thunderstorms.
Plant Cell Environ
December 2024
Plant Molecular Biology and Biotechnology Laboratory, School of Agriculture, Food, and Ecosystem Sciences, The University of Melbourne, Parkville, Australia.
Climate change is leading to more frequent and severe extreme temperature events, negatively impacting agricultural productivity and threatening global food security. Plant reproduction, the process fundamental to crop yield, is highly susceptible to heatwaves, which disrupt pollen development and ultimately affect seed-set and crop yields. Recent research has increasingly focused on understanding how pollen grains from various crops react to heat stress at the molecular and cellular levels.
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