19

Antibiotics are used in very different ways in cell culture and in livestock farming. As you note, in farming, antibiotics are used to manage infection in unsanitary conditions and also to increase animal growth. Farming is essentially an inherently non-sterile environment and so there's not really any good way to keep microbes from spreading and ...


14

The short answer: Fruits are large compared to seeds because humans have made them large. In the natural environment, there is a different set of evolutionary pressures. A fruit has to be able to successfully propagate itself using its seeds, while commercially farmed fruit is usually cloned via vegetative propagation. Therefore, the commercial farmed ...


13

Three of your examples: potato, tomato, and chilies, are from the genus Solanum. Along with the rest of the Solanaceae family, they are most diverse in the Americas but some species are found worldwide. Species that would be found originally in the 'old world' from the Solanum genus and Solanaceae family include the black nightshade, bittersweet nightshade, ...


5

Yes, the potato clock will work when still in the ground, but it won't work any better than a potato removed from the ground. Potato batteries are awesome and cool projects, but they often convey the wrong concept. The energy produced from a potato battery is not from the substance, nutrients, or sugars of the potato, but rather via the galvanic action of ...


4

I know this response is coming a bit late but in case you're still curious I have a response! I'm a M.Sc. student working in Agricultural entomology in Northern Canada (between 55 and 59 degrees North). You are correct, up at more Northern latitudes our short growing season mainly limits what crops we can grow, but less so our yield. We are also restricted ...


4

According to Evaluation of the Effect of Density on Potato Yield and Tuber Size Distribution potato tuber size was estimated using a normal distribution but they are not normally distributed They found that a Weibull distribution with specific parameters estimated better than a normal distribution. In fact you should not expect a normal distribution because ...


3

This is pear rust (Gymnosporangium sabinae). It is fairly widespread in the northern hemisphere: It is a fungal infection and affects pear trees from junipers. Pruning the affected nearby junipers can help control its spread.


3

Each species of flowering plant produces a set number of floral parts, more or less. Having three styles and three stigmas per flower is a trait that is determined genetically. Mutations can cause floral parts to be duplicated. Heirloom tomatoes have mutations in the fascicated and locule-number genes, resulting in more locules being produced per fruit. ...


3

Placing copper on one side of the potato and zinc on the other will not "suck the energy out of the potato". the energy in the potato NEVER gets converted into electricity. The metals do all the work, just using the potato as a wet sponge. Now, it would probably kill the potato though, because of all the ions that are there that shouldn't be there (zn and ...


3

It looks like that yeast has been engineered to produce starch. First of all, the authors had to knock out the genes responsible for the glycogen metabolism pathway (both glycolysis and gluconeogenesis). Then they introduced eight genes known to belong to the amylopectin biosynthetic pathway. The authors succeeded in having starch granules in yeast. You ...


2

Because seeds are not appealing to animals and they can only be carried by animals if they are made appealing - there are exceptions of course such as this one -. Seeds are covered with juicy layers that can be nutrient to animals in order to be made appealing and to be dispersed. Animals eat those juicy layers along with seeds, seeds resist digestion and ...


2

This is a big idea that's gaining momentum in many people's minds across the world. This is a brief and probably inadequate survey and hopefully other answers / comments will fill out a better picture. Most of the plans to reclaim arid regions are not completely hands off. It seems that the current thinking is that if we waited for microbes and lichen to ...


2

This is specific to navel oranges, which have a conjoined twin fruit. This blog gives an account of this.


2

Really, the credit for this answer goes to another 'Homo sapien' from the Spirulina manual link in his comment. Why do they use bottles or any type of bottle-like canister? Likely, because they are clear. From the manual: Spirulina needs sunlight so it is preferable that the container in which it is grown be transparent. Plastic bottles are cheap, clear, ...


2

Locusts have been harvested in Thailand and Australia they call them sky-prawns. They deep-fry them and consume them happily. http://www.bugsfeed.com/locust http://www.fao.org/docrep/017/i3246e/i3246e.pdf In Thailand Orthoptera or grasshoppers include Patanga succincta, Locusta migratoria, Acrida sp., Cyrtacanthacris tatarica and Oxya japonica japonica (...


2

Agave is more closely related to asparagus and hyacinths than to cactus. They are perrenial, you can harvest the lowest half of the leaves to make it look like a little palm tree, it will die after flowering, it takes 10-15 years to flower.


2

When harvesting agave nectar, generally the whole plant is harvested at once to get to the core, where most of the sap is. There isn't exactly an easy way to continually get nectar from the agave plant since it is herbaceous, whereas something like maple trees can be tapped because the wood can support the spigot.


2

Note that it is customary to restrict posts to a single question, which is easier to answer for these complex topics. I'll do what I can here. I'm going to deal with everything at once and then reference pieces in direct reference to your 3 questions. MECHANISMS OF CONSTRAINTS ON PLOIDY I think that it's worth separating out some of the different ...


2

Hybrid corn IS a "Mendelian selection scheme". The issue here is more predictability and uniformity of crop growth and yield. Normally, plants are genetically varied and having different versions of each gene from mother and father usually increases the fitness of the plant (this is sometimes called "hybrid vigor"). When farmers replant ...


2

The answer depends to some degree on what you mean by "some process of vernalization". As far as I know, the difference between winter and spring varieties is a matter mostly of how strong the response is, not whether the response exists. One paper writes in the abstract: Wheat cultivars are classified as two general types: winter wheat with ...


1

I believe you are looking for information on "sustainable agriculture". There are many aspects of production in agriculture like: fertilization, irrigation, pesticides and (no-)tillage. One can try to calculate the carbon foot-print of food (beware of the calculations, they might be misleading). Crop rotation is helpful in sustainable agriculture ...


1

Publications by the Food and Agriculture Organization http://www.fao.org/documents/card/en/c/ca9692en of the United Nations would be a good place to start as they are freely accessible. There are plenty of articles looking at crop yield of different production methods and different management techniques. You may consider subscribing to a journal, like ...


1

Tree grafting involves a rootstalk and a scion (part to be grafted onto the rootstalk). Here is a reference on the basics of grafting. Usually, this is done to combine the advantage of a strong or mature root system (from the rootstalk) with desired fruits or buds (produced by the scion). In this case, the roots of the scion plant might be sensitive, disease-...


1

Yes. It's quite common, to the degree that it's done by some hobbyist plant breeders. See en.wikipedia.org/wiki/Embryo_rescue However, AFAIK (I'm not an expert), it wouldn't be done for raising multitudes of plants, like tissue culture. Rather, it's used in hybridization, where you hope to produce hybrids from plants that don't readily hybridize. You ...


1

Modern grass crops (cereals) haven't run out in the wild is because that was the whole purpose of their development. What differs them from their wild counterparts are the domestication traits, like, seed shattering, uniform maturity, day length sensitivity etc. Modern grass based crops are significantly superior to wild grasses, they grow faster, are ...


1

The process of genetically modifying crops is performed in a lab. Genes would not leak into planted organic crops from compost any more than they would move from decomposing soil nematodes, earthworms, or manure. So no, organic plants would not be genetically modified. However, the labeling of a crop as "organic" is not always standardized, so it could be a ...


1

According to this document (pdf) the rate is around 700 lb seed per 500 lb of fibre. seed = 1·4 × fibre 230 kg fibre ≅ 320 kg seed (Strangely, the rate has fallen over time.)


1

This may have no correlation to your project but many insecticides, bacteriocides, and herbicides need a "solvent" or "transfer medium" such as water to be effective. Even when using ethanol in the laboratory against a variety of bacteria 100% ethanol becomes almost ineffective. I would take a look at running round-up again by itself versus 95% roundup 5% ...


1

One of the main contributors to inbreeding depression are recessive lethal alleles. Suppose you have an individual who has the genotype Aa, where A is the dominant, non-lethal allele and a is the recessive lethal allele. This recessive lethal allele is likely very rare in the population (selection would decrease the frequency of a recessive lethal allele), ...


1

One way getting most attention is re-deriving Crocus sativus again. Crocus sativus (with autotriploid chromosomes) is derived from Crocus cartwrightianus (diploid). ref for this is https://www.sciencedirect.com/science/article/pii/S1055790319300879 This article talks about resynthesizing the triploid https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4549961/ ...


Only top voted, non community-wiki answers of a minimum length are eligible