Top Tweets for #AFactADay
#1901. Seed physiological dormancy
It is an internal mechanism that prevents a viable seed from germinating through chemical and hormonal controls, even when environmental conditions are ideal.
#afactaday #SciComm
#1900. Seed persistence
It is the ability of viable seeds to remain ungerminated yet alive in a natural or controlled environment over time.
#afactaday #SciComm
#1899. Achene
It is a small, dry, one-seeded fruit that does not open at maturity. Unlike a true seed, it is a fruit, but the seed inside is not fused to the outer wall (making it easy to separate, unlike a grain or caryopsis).
#afactaday #SciComm
#1898. Scutellum
It is a specialized, shield-shaped single cotyledon found in grass and cereal seeds like corn, wheat, and rice. Its main job is to absorb food and nutrients stored in endosperm and pass them to the growing plant embryo during germination.
#afactaday #SciComm
#1897. Aleurone layer
It is the outermost boundary of a seed's endosperm, made of one or more rows of living, protein packed cells. It plays a vital role during germination by releasing digestive enzymes that break down stored food for growing plant embryo
#afactaday #SciComm
#1896. Caryopsis
It is a dry, one-seeded grass fruit commonly called a grain, where the ovary wall (pericarp) is tightly fused to the seed coat. This complete fusion makes the fruit and seed look and act as a single unit.
#afactaday #SciComm
#1895. Seed wing (or samara)
It is a flat, paper-thin plant tissue that helps seeds travel on the wind. These wings catch air currents to slow a seed's fall, allowing trees like maples, ashes, and firs to spread far from the parent plant.
#afactaday #SciComm
#1889. Secondary seed storage pest
It is an insect that cannot feed on whole, sound seeds. Instead, it feeds only on broken kernels, grain dust, or seeds already damaged by primary pests, mechanical handling, or fungi.
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#1886. Seed persistence
It is ability of mature seeds to survive in a viable state in environment or soil seed bank for more than one year. It acts as an ecological safety net, preserving genetic diversity
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#1885. Seed vigor
It is total of all seed properties that allow seeds to germinate fast, grow evenly, make strong plants, even when weather or soil conditions are bad. It goes beyond simple germination by testing how strong and healthy young plant will be.
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#1883. Seed ageing
It is the natural, irreversible process where a seed slowly loses its strength and ability to grow over time. It leads to weak sprouts, delayed growth, or complete death of the seed.
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#1881. Reactive oxygen species
It causes seed damage when an imbalance occurs between oxidant production & antioxidant defense during storage or imbibition. Excess ROS leads to oxidative stress, destroying cell structures, reducing seed vigor & viability.
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#1879. Boron deficiency
It disrupts plant reproduction by reducing pollen viability, preventing pollen tube growth, causing incomplete fertilization. This leads to drops in flower retention, empty or shriveled seeds, malformed embryos, severe yield losses
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#1875. Sugarcane fluff
It is also known as fuzz—is the true botanical seed harvested from sugarcane flowers. Breeders use this soft, light material to plant, grow, and crossbreed new and improved sugarcane plant varieties.
#afactaday #SciComm
#1870. Oat seed fluorescence test
It evaluates varietal purity and detects off-types or cultivar mixtures. It involves placing at least 400 seeds on a dark background under an ultraviolet light source in a darkened room.
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#1865. Accelerated ageing test
It is a physiological vigor assessment designed to predict the storability and longevity of seed lot. It artificially subjects seeds to severe stress—typically 41°C to 45°C and near 100% relative humidity—for 48 to 72 hours.
#afactaday #SciComm
#1864. The Hiltner brick gravel test
It is a seed vigor evaluation used to measure a seedling's mechanical strength. Developed in 1917, it gauges whether seeds can exert enough physical force to emerge through a dense layer of crushed brick.
#afactaday #SciComm
#1861. Seed moisture content
It is the amount of water in a seed, expressed as a percentage of its total weight. It is the single most critical factor determining seed viability and shelf life
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#1859. P50 (or p50)
It is the half-viability period of a seed lot. It is the exact time it takes for 50% of the stored seeds to lose their ability to germinate. Scientists use this standard measurement to compare the expected lifespan of seeds in storage.
#afactaday #SciComm
#1854. Seed priming
It is a pre-sowing technique where seeds are soaked in water or a specific solution to kick-start early germination processes, but dried before root emerges. This "pauses" seed so it germinates faster, survives better in harsh conditions
#afactaday #SciComm
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