En EspaŅol
Share

Ask Mr. Smarty Plants

Mr. Smarty Plants - Smarty Plants on cell elongation

Ask Mr. Smarty Plants is a free service provided by the staff and volunteers at the Lady Bird Johnson Wildflower Center.

Search Smarty Plants
    
 
See a list of all Smarty Plants questions
Can't find the answer in our existing FAQs, submit a question to Mr. Smarty Plants.

Need help with plant identification, visit the plant identification page.
 
rate this answer
11 ratings

Thursday - June 09, 2005

From: toronto, NV
Region: Select Region
Topic: General Botany
Title: Smarty Plants on cell elongation
Answered by: Joe Marcus

QUESTION:

Why do plants grow faster in the dark?

ANSWER:

In a strict sense, plants do not grow faster in the dark; they grow slower. However, plants seem to grow faster in insufficient light due to rapid cell elongation. In other words, they don't grow faster, they simply stretch. It is important to know that green plants really only grow as a result of photosynthetic processes. Without light photosynthesis ceases and plant tissue develop the characteristic, low-light induced sickly green or white coloration.

Rapid elongation of plant cells in low-light conditions is an emergency response on the part of the plant to return its plant tissues to the light where they can again photosynthesize and live. This would be analagous to standing on the bottom of a swimming pool and stretching to get your nose above water for a breath of life-giving oxygen.

In conditions of total darkness, plant cells will generally expand upward, a process called geotropism. In conditions where a small amount of light is reaching the plant, it will grow toward the brightest source of light in a process called heliotropism. Prolonged exposure to darkness will inevitably lead to the death of a plant.
 

More General Botany Questions

Alleotrophic effects of caffeine found in Ilex species
January 24, 2007 - I'm doing research for my biology class on the alleotrophic effects of caffeine. I'm planning to use Ilex vomitoria as the caffeine-producing plant. As the control I want to use another non-c...
view the full question and answer

Copper beech
May 12, 2005 - Hi, I work for a youth camp in southeastern Pennsylvania. The property for the camp was purchased from a farmer in 1958. The farmer was a collecter of unusual trees and one of the trees on our prop...
view the full question and answer

Half-life of the insecticide imidacloprid
March 07, 2011 - How long do systemic insecticides such as imidacloprid (Merit) remain active in nursery grown plants? Asclepias curassavica (tropical milkweed)is frequently grown with imidacloprid to prevent...
view the full question and answer

Fragrant Texas wildflowers from Waco TX
July 28, 2013 - Hi, I'm interested in looking at any Texas Wildflowers which have attractive aromas which I can distill essential oil from. Any ideas? Thanks
view the full question and answer

Plants addicted to caffeine
February 28, 2009 - Im doing a science project on if plants can get addicted to caffeine, but coffee in general and i was wondering what materials you need to figure that out.
view the full question and answer

Smarty Plants's Facebook profile Support the Wildflower Center by Donating Online or Becoming a Member today.

Mr. Smarty Plants wants you to be his Facebook friend. Click the Facebook icon to add yourself to Mr. Smarty Plants list of friends.
E-NEWSLETTER | BECOME A MEMBER | DONATE NOW | MEDIA | SITEMAP
© 2014 Lady Bird Johnson Wildflower Center