Science Current Events | Science News | Brightsurf.com
 

Old leaves need to die in time or they will bring a plant down

November 02, 2006

In a study from the November issue of The American Naturalist, researchers Alex Boonman and co-workers from the Netherlands show that it is beneficial for plants growing in a dense stand to shed their oldest, lower leaves once these become shaded. By using transgenic tobacco plants that do not shed their lower leaves, they were able to show that shaded old leaves become a burden to a plant because they no longer photosynthesize but still require energy to be maintained.

Moreover, the nutrients in these leaves can be more usefully employed by the plant when re-allocated to new leaves at the top of the canopy, where more light is available and higher photosynthetic rates can be attained. Previously, theoretical modeling has been extensively used to investigate how plants should distribute their leaf area and nutrients to maximize their photosynthesis and fitness. However, a direct experimental test was lacking till now.

"Keeping up with the neighbors is important for plants in leaf canopies" Alex Boonman states, "because failure to project enough leaf area at the top of the canopy means that some other plant will do it, with shading and therefore diminished photosynthesis as the consequence." The transgenics, which were originally developed by Susheng Gan and Richard Amasino at the University of Wisconsin, indeed produced less leaf area in the upper canopy layer than normal plants and performed less well in competition exeriments.

University of Chicago Press Journals


Related Plant Leaf Current Events and Plant Leaf News Articles


Sierra Nevada freshwater runoff could drop 26 percent by 2100, UC study finds
Freshwater runoff from the Sierra Nevada may decrease by as much as one-quarter by 2100 due to climate warming on the high slopes, according to scientists at UC Irvine and UC Merced.

Make your mobile device live up to its true potential -- as a data collection tool
Leaf measurements are often critical in plant physiological and ecological studies, but traditional methods have been time consuming and sometimes destructive to plant samples.

Smart application of surfactants gives sustainable agriculture
Anton Fagerström at Malmö University, Sweden, has investigated the interaction between the plant's barrier, plant protection products and adjuvants that are added to increase the effect of the plant protection product.

Marriage of convenience with a fungus
Thanks to a fungus, the medicinal plant ribwort plantain gains a higher concentration of the defensive compound catalpol. Biologists at Bielefeld University report this discovery in a study to be published this Thursday (22.5.2014) in the scientific journal 'Nature Communications'.

The mathematics of leaf decay
The colorful leaves piling up in your backyard this fall can be thought of as natural stores of carbon. In the springtime, leaves soak up carbon dioxide from the atmosphere, converting the gas into organic carbon compounds.

Ancient global warming allowed greening of Antarctica
Ancient Antarctica was warmer and wetter than previously suspected, enough to support vegetation along its edges, according to a new study.

Hacking code of leaf vein architecture solves mysteries, allows predictions of past climate
UCLA life scientists have discovered new laws that determine the construction of leaf vein systems as leaves grow and evolve. These easy-to-apply mathematical rules can now be used to better predict the climates of the past using the fossil record.

Study Shows Corn Gene Provides Resistance to Multiple Diseases
Researchers at North Carolina State University have found a specific gene in corn that appears to be associated with resistance to three important plant leaf diseases.

The lifeblood of leaves: Vein networks control plant patterns
New University of Arizona research indicates that leaf vein patterns correlate with functions such as carbon intake and water use - knowledge that could help scientists better understand the complex carbon cycle that is at the heart of global climate warming.

Scientists at CSHL discover mobile small RNAs that set up leaf patterning in plants
A key item in the developmental agenda of a plant leaf is the establishment of an axis that makes a leaf's top half distinct from its bottom half. This asymmetry is crucial for the leaf's function: it ensures that the leaf develops a flattened blade that is optimized for photosynthesis, with a top surface specialized for light harvesting and a bottom surface containing tiny pores that serve as locales for gas exchange.
More Plant Leaf Current Events and Plant Leaf News Articles

Leaves (Plant Parts)

Leaves (Plant Parts)
by Melanie Waldron (Author)


Leaves carry out a vital job for all flowering plants, they enable plants to make food. This book provides readers with a complete and comprehensive understanding of the role of leaves, their structure and how they are brilliantly designed to do this job. Clear diagrams, engaging text, and stunning photographs are used to explain what leaves are for, photosynthesis and how leaves work, the role they play in the movement of water around the plant, how shapes and styles of leaves vary, and why leaves are so important to us. A wide range of examples present readers with leaves they will be familiar with plus spectacular and unusual examples from around the world. These demonstrate what leaves have in common and some incredible adaptations that allow plants to survive in different conditions...

Look Once, Look Again: Plant Leaves (Look Once, Look Again: Science)

Look Once, Look Again: Plant Leaves (Look Once, Look Again: Science)
by David M Schwartz (Author), Dwight Kuhn (Photographer)


Just try to keep these books on the shelves! Children can't resist "diving" into these brightly colored books to explore their favorite topics. Young scientists will examine plant parts and animal features "up close" and then turn the page to see how these smaller parts fit into the "bigger picture." Children will take a close-up view of the powerful ears of a bat, the thorny stem of a blackberry bush, the sticky tongue of a fly, and more. Also perfect for five-senses study, this 24-book series of books features outstanding photographs by renowned nature photographer Dwight Kuhn and easy-to-read text by award-winning children's author David M. Schwartz.

Tree Finder: A Manual for Identification of Trees by their Leaves (Eastern US) (Nature Study Guides)

Tree Finder: A Manual for Identification of Trees by their Leaves (Eastern US) (Nature Study Guides)
by May Theilgaard Watts (Author)


Guide to identifying native (and some widely introduced) trees of U.S. and Canada east of the Rocky Mountains. Organized as a dichotomous key, the book leads the user through a series of simple questions about the shape or appearance of different parts of a tree. Includes 161 species. Illustrated with line drawings. The small (6" by 4") format fits in pocket or pack to take along on a hike.


The Four Leaf Clover Kit (Mega Mini Kits)

The Four Leaf Clover Kit (Mega Mini Kits)
by Pamela Liflander (Author)


For anyone who has ever searched the grass for that elusive predictor of good luck, here's something that eliminates all guesswork. The happy-go-lucky kit comes complete with a 32-page book filled with facts and trivia, plus seeds for growing your four-leaf clover. The box doubles as a planter!

Loose Leaf Version of Stern's Introductory Plant Biology

Loose Leaf Version of Stern's Introductory Plant Biology
by James Bidlack (Author), Shelley Jansky (Author), Kingsley Stern (Author)


This introductory text assumes little prior scientific knowledge on the part of the student. It includes sufficient information for some shorter introductory botany courses open to both majors and nonmajors, and is arranged so that certain sections can be omitted without disrupting the overall continuity of the course. Stern emphasizes current interests while presenting basic botanical principles. This latest edition incorporates measurable learning outcomes and updated readings. Students will be introduced to the new classification of plants and plant-related species, integration of biotechnology into several chapters and inclusion of new text boxes addressing the areas of ecology, evolution and molecular biology. New photos have replaced older pictures or have been added also.
With...

Leaves (Plant Parts series)

Leaves (Plant Parts series)
by Vijaya Khisty Bodach (Author)


Simple text and photographs present the leaves of plants, how they grow, and their uses.

Kratom: The Beginners Guide To Understanding Kratom Plants, Kratom Powders, Kratom Leaves, and Kratom Extract (Kratom Plant, Kratom for Beginners, Kratom Guide, The Beginner Kratom Guide)

Kratom: The Beginners Guide To Understanding Kratom Plants, Kratom Powders, Kratom Leaves, and Kratom Extract (Kratom Plant, Kratom for Beginners, Kratom Guide, The Beginner Kratom Guide)
by Micheal Kratom (Author)


Everything You Need To Know About Kratom!

Kratom is a plant of much controversy and debate. A tree indigenous to Southeast Asia that clearly provides beneficial effects, yet it seems that the governments of these areas are doing their best to eradicate. Probably because its existence cuts through their profits and income from the trade of opiate derivatives which is a multibillion dollar business.

People have been chewing its leaves for no one knows how long. Those with a deeper knowledge and understanding of its properties speak of a natural substance that lifts moods, stimulates the body, can be used in chronic pain management, can be used as an antidiarrheal and can even be used against premature ejaculation in sexual intercourse, among other things. For them,...

Curry Leaf Plant: Growing Practices and Nutritional Information

Curry Leaf Plant: Growing Practices and Nutritional Information
by Roby Jose Ciju (Author)


Botanical name of curry leaf plant is Murraya koenigii. It belongs to the family Rutaceace, the citrus family. Curry leaf plant is tropical to subtropical in growth habit. It is grown as a perennial plant which when grown in an open space, grows into a small tree of up to 5 meters in height; while growing in containers and greenhouses, it grows into a small bushy shrub of up to 2.5 meters in height.

How Plants Clean the Air: One Leaf at a Time (Science Slam: Plant-Ology)

How Plants Clean the Air: One Leaf at a Time (Science Slam: Plant-Ology)
by Ellen Lawrence (Author)


Trees and other plants make our world look beautiful, but did you know that plants use their leaves to help keep the air clean and safe for us to breathe? This book takes readers step-by-step through a clear, grade-appropriate explanation of how plants remove carbon dioxide from the air during photosynthesis. Readers will also learn how plants can even remove harmful chemicals from the air in our homes. Filled with information perfectly suited to the abilities and interests of an early elementary audience, this colorful, fact-filled title gives readers a chance not only to learn, but also to develop their powers of observation and critical thinking. From beautiful photographs to high-interest facts, this book makes learning about the amazing air-cleaning properties of plants, a lively and...

What Do Roots, Stems, Leaves, and Flowers Do? (The World of Plants)

What Do Roots, Stems, Leaves, and Flowers Do? (The World of Plants)
by Ruth Owen (Author)


Flowers are more than just beautiful, fragrant objects for our enjoyment. Pink petals, green stems, dark unfurling leaves: though we have seen them countless times, do we truly know what they are there for? In this title, readers will learn in detail the many parts of a plant.

© 2016 BrightSurf.com