Auxin

Determining the impact of Auxin in pea plants, and its effect on lateral bud growth Megan Posey Bio 121-104 John Barry 10/23/16 Abstract Auxin is a hormone that helps to regulate bud growth, cell elongation, and many other aspects of plants. Apical dominance is a phenomenon that occurs due to the presence of auxin and stops lateral bud growth. In this experiment, we tested the hypothesis that a group of pea plants without treatment of auxin would have the most lateral bud growth, the 500 ppm group treated with auxin would have little bud growth, and the 5,000 ppm group treated with auxin wouldn’t have any growth. The significance of these numbers was then determined by the use of a Wilcoxon test. The control group showed to be significantly…

There are several different types of plant hormones some of which inhibit or promote growth in the plant. There are also synthetic varieties of these plant hormones, specifically the plant hormone auxin which has many different synthetic compounds. There is not much data on the impact that these synthetic hormones have on plants growth rate in pea plants. In order to understand the impacts of synthetic auxin an experiment was conducted using natural auxin, naphthaleneacetic acid, and…

Plant Hormones: DIAGRAMS/PICTURES NEEDED: Hormone Locations (color coordinated and showing relative concentrations) Auxin- Auxin is a hormone that’s main function is to promote cell elongation in stems, buds and roots and also plays a small part in the differentiation or new cells. Auxin is present in high concentrations in germinating fruits and seeds, but it is not yet known whether this high concentration of auxin is passed on from the mother or whether is is created but the developing…

The concentration of the auxin was not strong enough to maintain full dormancy of the lateral buds. The application of auxin is also dependent on the stage of development the plant is in for example auxin applied to a fruit tree can either drop the fruit or prevent the fruit from dropping depending on the stage the plant is in (Biology online.,(n.d)).According to scientific journals, like the plant journal, it is stated that cytokinin helps lateral bud growth as it allows the buds to escape…

conducts these triggered responses (Campbell, 2008). There are many classes of plant hormones, yet the main ones of scientific focus when discussing plant growth and development are auxin, cytokinins, abscisic acid, ethylene, and gibberellins. Auxin stimulates stem elongation by a process referred to as the acid growth hypothesis. This hypothesis states that auxin will increase the activity of proton pumps in the plasma membrane of plant cells, leading to a lower pH within the cell wall, which…

co-ordination of all these processes and also plays a central role in the development of the plants (Burg, S. P. (1968). Ethylene is a gaseous growth factor that is involved in a diverse group of cellular, developmental and stress related processes in plants like it inhibits the cell division, synthesis of DNA and growth in the meristems of roots, shoots and axillary buds without persuading RNA synthesis (Tang et al, 1993). When the ethylene is removed then apical dominance is often broken…

defoliate the trees so the Viet Cong would have less cover. The most effective way to do this was through a contact herbicide known as a Growth Regulator Herbicide. These types of herbicides are known as endocrine disrupters and work by disrupting the hormone systems of plants. Although normally applied directly to the foliage, the roots of the plant can absorb any amount of herbicide that gets into the soil, eventually causing it to die. Endocrine disrupters wreak havoc on the hormonal balance…

Only touching certain areas can trigger the response. (Also leaves closing.) Touching the leaves specifically allows for plant movement, by causing a series of seismic shockwaves invisible to the naked eye. These shockwaves are transmitted down the leaf and stem through the sieve tubes (“Physiology of plant movements,” n.d.). Sieve tubes are a network of sieve elements, that connect throughout the plant. Each sieve element lacks a nucleus, so it cannot sustain itself without an ever present…

independently and affect the growth of plants. In this investigation, higher concentrated solutions of cytokinin hormones (zeatin) will be tested on the germination of Brassica rapa seeds to determine their effect on the quality of the radicle and hypocotyl. This is relevant question for the life of plants because cytokinins primarily promote lateral growth (branching out), balanced by auxins (a different plant growth hormone) which combat lateral growth. It is crucial for germination because…

non‐clonal propagation while a high concentration of NAA (2 mg/l) in a combination of 0.5 mg/l BAP favors the clonal propagation vegetatively in the second pathway. In the present study, the combination of NAA and BAP showed a significant increase in the production of the higher number of plantlets. As the concentration of BAP from 0.5 to 2.0 mg/l considerably increased the multiple shoot production was increased. NAA in low concentration is successfully used as an auxin to initiate PLBs…