Concept explainers
To discuss: The effect of Fusicoccin on the growth of “isolated stem sections”.
Concept introduction:
Stimulation of “plasma membrane proton (H+) pumps” of plant cells causes following changes:
- 1. Decreases the cell wall pH
- 2. Increases the membrane potential
- 1. Changes followed by “decrease in cell wall pH”:
Lowering pH raises acidity level on the cell wall which activates proteins called expansions. These expansions disrupt the hydrogen bonds. The bonds are found in between cell wall constituents and cellulose microfibrils. This loosens the cell wall.
- 2. Changes followed by “increase in membrane potential”:
Increased membrane potential promotes the ion transmission into the cell. This process initiates water absorption by osmosis. More amount of water simultaneously increases the turgor and which in turn increases the flexibility of cell wall. The increase in cell wall flexibility enables the elongation of the stem.
Want to see the full answer?
Check out a sample textbook solutionChapter 39 Solutions
BIOLOGY DUAL ENROLLMENT VERSION
- Although potato tuber is an underground plant part, it is considered asa stem. Give two reasons.arrow_forwardFungal reproduction: Provide name of structures in photo A and B and describe if the structure is involved in asexual or sexual reproduction Photo A below Photo B below 667 umarrow_forwarddescribe the molecular switches involved during stationary growth phasearrow_forward
- Differentiate the colchicine-treated and untreated root tips cells in Allium cepaarrow_forwardIn a practice known as crop rotation, farmers alternate a crop of legumes (plants like beans, whose roots bear nodules containing Rhizobium) with a crop of non- legumes. What is the benefit of this practice?arrow_forwardWhat is the movement of fungal hyphae towards sugar and peptones known as?arrow_forward
- 7. a)Tea plants contain several chemical compounds, including tannins and caffeine. What function do both tannins and caffeine perform for tea leaves? b)By what process does water enter the root cells of a plant? c)The blade of the leaf is attached to the stem by a stoma. Is this true or false?arrow_forwardWhat is the potential role of fungal endophytes in enhancing the stress tolerance of plant species in harsh environmental conditions?arrow_forwardThe specific relationship between a legume and its mutualisticRhizobium strain probably depends on(A) each legume having a chemical dialogue with a fungus.(B) each Rhizobium strain having a form of nitrogenase thatworks only in the appropriate legume host.(C) each legume being found where the soil has only theRhizobium specific to that legume.(D) specific recognition between chemical signals and signalreceptors of the Rhizobium strain and legume species.arrow_forward
- How plants provide protection from fungal disease?arrow_forwardA B C D G E F H a) On the diagram, which labeled structure represents the mature male gametophyte? I b) Which labeled structure represents the female megasporangium, prior to the production of spores? c) On the diagram, which labeled structure represents the immature male gametophyte? F d) Which labeled structure represents the mature female gametophyte? Jarrow_forwardDescribe the effects of the following on photosythesis in the intact leaf a)leaf properties b)light c) tempereture d)carbondioxidearrow_forward
- Biology (MindTap Course List)BiologyISBN:9781337392938Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. BergPublisher:Cengage LearningBiology: The Dynamic Science (MindTap Course List)BiologyISBN:9781305389892Author:Peter J. Russell, Paul E. Hertz, Beverly McMillanPublisher:Cengage Learning