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
BIO 1 + MAST CODE >IC<
- In 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_forwardGinger undergoes three (3) stages of Growth. Name and describe the these stages from Germinating stage to time for harvestingarrow_forwardWhat causes supercooling? Why is the lowest point reached not considered the freezing point of the sap solution?arrow_forward
- Arrange the following subset of cell depreciation during plant growth ( in length ) in the correct sequence . 1) cell division in primary meristem . 2) cell division in apical meristem . 3) differentiated cells . 4) growing cells in primary meristem.arrow_forwardAlthough potato tuber is an underground plant part, it is considered asa stem. Give two reasons.arrow_forwardName the type of cell division that occurs during growth of shoot.arrow_forward
- TRUE OR FALSE Rice varieties with erectophile leaves are more susceptible to photorespiration compared to those with planophile leaves.arrow_forwardSimpLENI will be competing in a Lugaw Cooking Competition in May. She will be using onions as a special ingredient and garnish in her recipe. She then planted onions in two soil treatments labelled as ANGAT and UNITY. After a week, SimpLENI noticed that her onions in ANGAT increased in number compared to that of onions in UNITY. She then hypothesized that the soil treatments affected the cellular division in the roots of onions contributing to the difference in yield. To prove this, SimpLENI prepared longitudinal sections of onion root tips. Support SimpLENI in her experiment and win the competition by answering the following questions:arrow_forwardIn order to increase the yield of wheat, scientists crossed wheat varieties with different species and of different genus. Write in detail the method of tissue culture they have used.arrow_forward
- What are the different stages of mitosis present in the photomicrograph of Allium cepa root tip?arrow_forwardIt is the term referring to the characteristic leaf structure of C4 plants that enables them to outperform C3 plants in an environment that has high O2 concentration and/or temperature. Unlike C3 and CAM plants, C4 plants, such as corn and sugarcane, have leaves with vascular bundles that are surrounded by a chloroplast-rich vascular bundle sheath, which is further surrounded by the spongy mesophyll.arrow_forwardwhat is the protein complex embedded in the thylakoid membrane that allows protons to flow down their concentration gradient from thylakoid lumen to the stroma? also, the free energy from the flow of protons is used to power which process?arrow_forward
- Biology 2eBiologyISBN:9781947172517Author:Matthew Douglas, Jung Choi, Mary Ann ClarkPublisher:OpenStax