Category: Agriculture

Amazing Maize

11/23/2022

Dorothy Hinshaw Patent

Nature's Animal Ambassador

If I asked you what grain is the most harvested in the world, you’d probably answer either wheat or rice. But the answer is actually corn, more accurately called ‘maize.’ This nutritious crop that originated in Mexico feeds not only people but also animals around the world. We’re used to the wonderfully tender sweet corn harvested in late summer and early autumn, but most maize is actually field corn, more starchy than sweet and used as animal feed or to make cornmeal and flour.

For a long time, biologists puzzled about the origins of this important crop. There is no wild plant that looks anything like modern corn, which is actually a giant grass. The closest relative is a scrawny branching plant with hard dark seeds called teosinte. It seems a huge jump from teosinte to corn, yet geneticist George Beadle found in the 1930s that corn and teosinte have the same number of chromosomes and could be crossbred to produce hybrids. With the limited tools available at that time, Beadle deduced that only about five genes were involved in creating the differences between teosinte and corn.

Fast forward to modern times, when scientists can look directly at DNA and analyze every detail of its structure. We now know that Beadle came very close to the truth—about five regions in the DNA seem to control the major differences between teosinte and corn. For example, these two plants look so very different, yet just one single gene turns a branched plant into a single stalk, like a stalk of corn. Another single gene controls one of the most dramatic and certainly most important traits for farmers—the nature of the seeds and their stalk. In teosinte, each seed has a hard covering. Just one gene eliminates the hard covering and produces a stalk bearing exposed seeds, like an ear of corn.

Scientists now use maize as a perfect example of two major ways evolution happens. One way is through major sudden jumps, like the change from a branching plant to a single stalk. The other is the more gradual kind of change that has led to the thousands of different kinds of maize grown by farmers today. There are probably hundreds of varieties of sweet corn and thousands of varieties of field corn. Think about that the next time you bite into a nice crunchy taco made from a corn tortilla.

Here you can see the major differences between a teosinte plant and a corn plant. Credit:TeosinteCornUOR

Corn was a very important crop for homesteaders in the American West, used both to feed themselves as well as their animals. Read about it in Homesteading: Settling America's Heartland, revised and expanded edition, Mountain Press, 2013.

Dorothy Hinshaw Patent is a member of iNK's Authors on Call and is available for classroom programs through Field Trip Zoom, a terrific technology that requires only a computer, wifi, and a webcam. Click here to find out more.

MLA 8 Citation
Patent, Dorothy Hinshaw. "Amazing Maize." Nonfiction Minute, iNK Think Tank, 8
June 2018, www.nonfictionminute.org/the-nonfiction-minute/Amazing-Maize.

0 Comments

Happy Birthday Thomas Jefferson—Smuggler!

4/26/2022

1 Comment

Peggy Thomas

Curiosity queen: writing science, history, and everything in between

On April 13, 1787 Thomas Jefferson celebrated his 44th birthday riding a mule over the Alps on his way to Italy. Jefferson’s first official federal position after writing the Declaration of Independence was serving as Minister to France under President George Washington. Jefferson’s job was to grow America’s economy, which he did by forming trade agreements to sell whale oil and tobacco overseas. He also looked for new crops that could be grown in the U.S. and sold in Europe.

One thing he noticed was that the French ate a lot of rice, but they didn’t buy rice grown in America. The French preferred dry or upland rice. American farmers grew “swamp” rice and suffered with mosquitoes and malaria. Jefferson thought that if American farmers switched to upland rice they would not only be able to sell it abroad, they would also be healthier.

Jefferson asked for samples of upland rice from friends, farmers, ship captains who traveled to far off lands, and even the seven-year-old prince of Cochin China. The most prized rice, however, was grown in Italy and banned from export.

Determined to help America, Jefferson rode over the Alps and found the unhusked grain. “I could only bring off as much as my coat and surtout [overcoat] pockets would hold,” he wrote a friend. Under penalty of death, he smuggled it across the border.

Back in France, Jefferson sent rice to farmers in South Carolina and to his farm manager at Monticello, his home in Virginia. He even grew samples of rice in pots on his windowsill when he returned to New York to be Secretary of State.

Unfortunately, the upland rice didn’t grow well in the South and didn’t become a big export for the U.S., but Jefferson was not discouraged. He had already set his sights on another amazing plant that he hoped would be “the source of the greatest wealth and happiness.” Olive trees.

Many years later when Jefferson listed his achievements, along with writing the Declaration of Independence he included his attempts to bring rice and olives to the United States. “The greatest service which can be rendered any country,” he said, “is to add an useful plant to its culture.”

Celebrate his birthday with a salad made from some of the useful plants he brought to our culture— kale, tomatoes, peppers and chickpeas with a splash of olive oil.

Happy Birthday, Thomas Jefferson!

Portrait of Thomas Jefferson while in London in 1786, 15 years before he began his presidency. By Mather Brown. Library of Congress, courtesy of the National Portrait Gallery, Smithsonian Institution

After service as Secretary of State (1790–93), Jefferson began rebuilding his Virginia home, Monticello, based on the ideas he had acquired in Europe. The home is a major tourist attraction today.

Peggy Thomas is the author of Thomas Jefferson Grows a Nation

Among her other books are:
* For the Birds: the life of Roger Tory Peterson
* Snow Dance
* Farmer George Plants A Nation
* Joshua the Giant Frog
* Forensic Anthropology: the Science of Talking Bones

MLA 8 Citation
Thomas, Peggy. "Happy Birthday Thomas Jefferson - Smuggler!" Nonfiction Minute,
iNK Think Tank, 13 Apr. 2018, www.nonfictionminute.org/
the-nonfiction-minute/happy-birthday-thomas-jefferson-smuggler.

1 Comment

The Flaw in the Seedless Banana

1/18/2022

4 Comments

Dorothy Hinshaw Patent
Nature’s Animal Ambassador

You can see how little fruit is inside a wild banana.

You probably eat bananas at least once a week—they are the most popular of all fruits, even surpassing the apple. But have you ever noticed that bananas have no seeds? Probably not. You just peel them and enjoy their soft, seedless flesh without even thinking about seeds.

If you’d been strolling through a tropical forest in New Guinea thousands of years ago and reached up to pluck a wild banana snack, you wouldn’t have wanted to eat it. The banana ancestors had big hard seeds surrounded by a small amount of sweet flesh, not worth peeling. Sometimes, however, plants appeared with fruit that had no seeds. Over time, people cherished these seedless fruits and grew the plants for their own use.

The banana plant sends up a central stalk surrounded by very large leaves, then flowers at the tip. The flowers produce a heavy load of bananas without being pollinated. Then the stalk dies. Meanwhile, the stalk sends out side shoots that become new plants. That’s a form of cloning, meaning that all of a banana plant’s progeny are genetically identical, both to their parent and to one another.

The ancestors of the modern banana could reproduce in the usual way, so their seeds contained mixtures of DNA from the mother plant and DNA from another plant’s pollen. This “sexual reproduction” allows for the genes of the plants to be combined in new ways. If a disease came along, it might kill most of the plants, but some others could have natural resistance and survive.

Because it lacks seeds, the banana has gotten into trouble. Back in the 1950s, an especially sweet and tasty variety called the Gros Michel was the commercial banana. But a devastating fungus came along and killed the plants and contaminated the soil. Growers then chose another variety, Cavendish, which resisted the disease. But now a wilt called Panama disease has shown up that kills the Cavendish plants. And because bananas lack genetic diversity and because they don’t develop seeds that mix up their genes, the Cavendish has no way of defending itself.

Banana growers are doing what they can to stop the spread of the disease, however, and up to now they have been successful. But don’t be surprised if in a few years the bananas you buy look and taste different. Luckily, there are other varieties out there, like small “finger” bananas and larger red-skinned fruits, that you can already buy in places like Hawaii.

These bananas are ready for harvest.

The banana flower cluster is huge. You can see the bananas beginning to form in the upper right of the photo.

Here are just a few kinds of bananas, from left to right—plantains, which are starchy rather than sweet; red bananas; finger bananas; and Cavendish bananas

Dorothy Hinshaw Patent's new nonfiction picture book about horses has a fresh focus: how people over the ages have decorated horses in special ways. Organized into three categories—warfare and hunting, performance and competition, performance, and ceremony—the book introduces horses such as the chariot-pulling war horse of the Persians to the rose-decorated winner of the Kentucky Derby. For more information, click here.

Dorothy Hinshaw Patent is a member of iNK's Authors on Call and is available for classroom programs through Field Trip Zoom, a terrific technology that requires only a computer, wifi, and a webcam. Click here to find out more.

MLA 8 Citation
Patent, Dorothy Hinshaw. "The Flaw in the Seedless Banana." Nonfiction Minute, iNK Think Tank, 21 Dec. 2017, www.nonfictionminute.org/ the-nonfiction-minute/The-Flaw-in-the-Seedless-Banana. Accessed 21 Dec. 2017.

4 Comments

A Renaissance Man—4,000 Years Before the Renaissance

3/28/2021

0 Comments

Jim Whiting
The Running Encyclopedia

The Renaissance began in Europe in the 15th century and marked the change from the medieval period to the modern world. Towering figures such as Michelangelo, Galileo, and especially Leonardo da Vinci were known as Renaissance men because of their talents and lasting achievements in several important areas of knowledge. They were also accomplished musicians, public speakers, athletes, poets, and so forth. And they were expected to do all this stuff without breaking a sweat.

You could give the same title to an ancient Egyptian named Imhotep, who lived about 2600 BCE. He was the vizier, the most important government official, during the reign of Pharaoh Djoser. He served as the high priest of the god Ra and was an expert astronomer.

Imhotep designed and oversaw the building of the first major pyramid in Egypt. Located at Saqqara, at the time it was the world’s tallest structure. He innovated the use of stones rather than mud bricks to build it, and it was that added strength that enabled the pyramid to rise so high. He is also credited with the invention of several devices that facilitated the construction.

Many people believe that Imhotep, rather than the Greek Hippocrates who lived more than 2,000 years later, is the real “Father of Medicine.” In an era when most physicians relied on magic spells and appeals to the gods, Imhotep prescribed dozens of effective down-to-earth treatments for illnesses and injuries.

He is credited with ending a seven-year famine in Egypt. He advised the pharaoh to make sacrifices to Khnum, the god of the annual flooding of the Nile River, and thereby provide desperately needed water to farmers. On a more practical level, he invented an improved irrigation system to carry water to the crops even if the river level was abnormally low.

In addition to these accomplishments, an inscription at the base of one of his statues notes that he was “Chief Carpenter, Chief Sculptor, and Maker of Vases in Chief.” In his little spare time, he wrote poetry and dispensed philosophical advice.

Imhotep can also boast of two accomplishments that eluded even Leonardo da Vinci. He was deified after his death and worshipped for many centuries, an honor accorded to hardly anyone besides the pharaohs. And today the comic book community gives him the credit for founding S.H.I.E.L.D., the Marvel Comics espionage and crime-fighting agency that became the basis for blockbuster movies such as Iron Man, Thor, and Captain America.

A statue of imhotep in the Louvre, one of three statues all with the same pose. Photo taken by Dr Nigel Hawkins. Wikimedia Commons

Egyptologists ascribe to Imhotep the design of the Pyramid of Djoser (the Step Pyramid) at Saqqara in Egypt in 2630 – 2611 BC. Wikimedia Commons

Jim Whiting has written a book on another great Egyptian leader -- Ramses the Great who lived about 1350 years after Imhotep. He fully lived up to the "Great" part of his name. His reign lasted for 67 years, the second longest in Egypt’s 3,000-year history. He had dozens of wives and more than 100 children, outliving many of them. He was a military leader who expanded the borders of his country. That resulted in decades of peace and prosperity for his people. He ordered huge statues of himself to be erected all over Egypt. For more information, click here.

MLA 8 Citation
Whiting, Jim. "A Renaissance Man - 4,000 Years before the Renaissance."
     Nonfiction Minute`, iNK Think Tank, 8 Feb. 2018,
     www.nonfictionminute.org/the-nonfiction-minute/
     A-Renaissance-Man-4,000-Years-Before-the-Renaissance.

0 Comments

<<Previous

Amazing Maize

Happy Birthday Thomas Jefferson—Smuggler!

The Flaw in the Seedless Banana

A Renaissance Man—4,000 Years Before the Renaissance

Categories

Archives