Science Current Events | Science News |

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 Vijaya Khisty Bodach (Author)

Text and photographs introduce leaves found on trees and plants, and includes information on how they grow, along with their uses.

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...

Trees, Leaves & Bark (Take Along Guides)

Trees, Leaves & Bark (Take Along Guides)
by Diane Burns (Author)

An introduction to the world of insects, caterpillars, and butterflies including identification information, educational activities, and fun facts.Invites young naturalists to spot wildlife. Safety tips are provided and interesting activities are sugested. Color illustrations enhance the presentation. ―-HORN BOOKS (Tracks, Scats and Signs)

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)

Introduces, in simple text and photographs, the leaves of moss, cabbage, fern, sundew, maple, and the colored leaves of autumn.

Medicinal Plants of North America: A Field Guide (Falcon Guide)

Medicinal Plants of North America: A Field Guide (Falcon Guide)
by Jim Meuninck (Author)

This exquisitely detailed full-color field guide, by biologist and herbal and medical plant expert Jim Meuninck, provides identification, practical information, and skills for the location of and use of medicinal plants. The pages of this book re-connect us to our roots and the knowledge that medicinal plants and wild plant foods provide the chemicals every body needs to obtain optimum health and prevent disease. Meuninck moves the user from simple and familiar plants toward less common plants more difficult to identify. Each of the 122 plants has a color photograph, plant description, and location. Identification of plants are grouped from common to rare in the environment and where they are found: prairies, woodlands, mountains, deserts, and wetlands. Relevant facts about each plant...

The Sweetness Of Bitter Leaf: Miracle Plant For Treating Diabetes, Cancer And Other High Risk Chronic Diseases (Nature's Wonder Plant Book 1)

The Sweetness Of Bitter Leaf: Miracle Plant For Treating Diabetes, Cancer And Other High Risk Chronic Diseases (Nature's Wonder Plant Book 1)
by Davlin Publishing

About This eBook
The Sweetness of Bitter Leaf: Miracle Plant for Treating Diabetes, Cancer and Other High-Risk Chronic Diseases is an eBook that aims to promote knowledge about a plant with superb natural medicinal capabilities - the Bitter Leaf.
This eBook provides important information regarding Vernonia amygdalina, or the Bitter Leaf plant. Hopefully, the information would increase interest and awareness regarding this miraculous shrub’s medicinal uses which include natural healing capabilities to treat several chronic diseases such as diabetes and cancer. Everything is written in a simple, easy-to-understand way that we hope will serve as an introduction to this wonderful natural cure.
The Sweetness Of Bitter Leaf
You will also find information regarding...

A Field Guide to Edible Wild Plants: Eastern and central North America (Peterson Field Guides)

A Field Guide to Edible Wild Plants: Eastern and central North America (Peterson Field Guides)
by Lee Allen Peterson (Author), Lee Allen Peterson (Illustrator), Lee Allen Peterson (Illustrator), Roger Tory Peterson (Illustrator), Roger Tory Peterson (Illustrator)

More than 370 edible wild plants, plus 37 poisonous look-alikes, are described here, with 400 drawings and 78 color photographs showing precisely how to recognize each species. Also included are habitat descriptions, lists of plants by season, and preparation instructions for 22 different food uses.

Plants, Grades 1-3

Plants, Grades 1-3
by Evan Moor (Author)

Plants covers these concepts: a plant is a living thing, plants have many parts, each part of a plant has a special function, the fruit of a flowering plant contains seeds, seeds contain new plants, seeds travel in many ways, plants change as they grow, plants need food, water, and light to grow, people need plants for food and oxygen, and not all plants reproduce from seeds made by flowers. A variety of engaging activities present the concepts in ways that students can understand. Each concept presented includes: teacher directions for lessons and reproducible resource pages such as sets of picture cards, minibooks, and lab sheets to record the results of hands-on investigations.

Look What I Did with a Leaf! (Naturecraft)

Look What I Did with a Leaf! (Naturecraft)
by Morteza E. Sohi (Author), Morteza E. Sohi (Illustrator)

Look What I Did with a Leaf! will show young art and craft lovers how to use nature's bounty to create fanciful animals and natural scenes. Readers will develop their artistic eye and soon learn to see the artistic possibilities that surround them. Morteza E. Sohi gives careful directions on how to choose leaves for shape and color, how to arrange them in an animal form, and how to preserve the finished work of art. A field guide helps young leaf artists learn more about the tools of their craft.

© 2015