Breeding better seeds: Healthy food for more people

Breeding better seeds: Healthy food for more people
Researchers used genetic engineering to create a type of cotton seed without a substance that is toxic to humans. Now humans can eat these cotton seeds, which are a great source of protein and fiber. Credit: Beth Luedeker

Your morning cereal or oatmeal. The bread on your sandwich. The corn chips for your snack, and the cookies for dessert. Not one would be possible with the humblest of ingredients: the seed.

Seeds such as wheat, rice and corn directly provide about 70% of the calories eaten by people every day. And they ultimately provide nearly every morsel of food, either by providing feed for livestock or by being grown into fruits and vegetables. It's no overstatement to say that without seeds, civilization would be impossible.

But seeds need our help. They are under stress from climate change, and under pressure to feed a .

Scores of dedicated scientists spend their careers working to improve seeds. They are using the latest scientific advances to make seeds larger, more nutritious, and more resilient to stress.

Rodomiro Ortiz studies how plant breeding can help meet these goals. His research was recently published in Crop Science, a journal of the Crop Science Society of America.

As the science behind improvements, plant breeding is the foundation for ensuring agriculture meets humanity's needs.

"The seeds generated from plant breeding have desired traits that allow increases in productivity, reduce human malnutrition, improve genetic diversity in ecosystems, and ensure sustainable food production under the specter of global warming," says Ortiz.

Breeding better seeds: Healthy food for more people
A team of scientist investigates how to breed quinoa to be more heat tolerant as some areas have experienced slowly increasing temperatures or more frequent and extreme spikes in temperature. These tolerant quinoa varieties will produce seed, even in harsh conditions. Credit: Kevin Murphy

Classic plant breeding doesn't add in extra DNA like genetic engineering does. Instead, plant breeders cross that each have uniquely strong features to create a new plant with several beneficial traits. The same process has been used by farmers and scientists for thousands of years to make better crops.

But today, plant breeders have access to more information and more tools than ever. For example, the widespread use of DNA sequencing gives plant breeders huge troves of data about useful genes. By figuring out which genes give rise to which useful traits, plant breeders can develop new varieties of crops much more quickly.

"Genome-derived knowledge of seed biology can enhance crop productivity, to improve food and nutritional supply through plant breeding," says Ortiz.

But genes are only one piece of the puzzle. Scientists like Ortiz need to know how the plant grows and what it looks like. In the past, scientists might have been able to easily look and tell that one plant had, for example, larger seeds. But today, improving seeds requires ever greater detail.

Enter phenotyping, the science of measurement. A plant's phenotype is its entire expression of its genes in its environment. The height and color of the plant. Its seeds' weight and shape. Its tendency to resist or succumb to disease—these are all the phenotype.

Capturing this information is time intensive. Some of these traits are impossible for humans to even see. And seeds in particular are so small, measuring them by hand is unrealistic. Technology comes to the rescue.

"Phenotyping seed traits is a major bottleneck to systematic analysis of seed variation," says Ortiz. "Advances in can automatically measure a variety of shape parameters using high resolution images of seeds."

With these tools in hand, plant breeders can improve seeds and develop new crop varieties faster than ever. Ortiz envisions making seeds larger, so each one has more calories to feed people. Larger seeds can also help the next generation of quickly grow in the fields, ready to produce a big yield. And are trying to make seed proteins more nutritious or the fats inside seeds stable enough to last on grocery store shelves for longer.

Each of those improvements mean stronger seeds, and better food, for more people. So with your next spoonful of chewy oatmeal, consider the humble seed—and the advanced tech and know-how—behind every bite.


Explore further

The keys to a major boost for hybrid wheat breeding

More information: Sangam L. Dwivedi et al, First the seed: Genomic advances in seed science for improved crop productivity and food security, Crop Science (2020). DOI: 10.1002/csc2.20402
Citation: Breeding better seeds: Healthy food for more people (2021, February 17) retrieved 28 February 2021 from https://phys.org/news/2021-02-seeds-healthy-food-people.html
This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.
3 shares

Feedback to editors

User comments