Mechanism of action of Trichoderma Trichoderma spp. are biocontrol agents effective against fungal phytopathogens. They can act indirectly, by competing for nutrients and space . Biocontrol may additionally result from an immediate interaction among the pathogen itself and the biocontrol agent, as in mycoparasitism. Trichoderma biocontrol agents can promote plant growth and stimulate the plant defense mechanisms (Papavizas, 1985; Howell, 2003; Vinale et al., 2008).
The scientific name is Elodea Canadensis (Ashley, 2000). This experiment will look at the effect of light intensity on the rate of photosynthesis in Elodea plants. Aim The aim of this experiment is to examine the effect of light intensity on the rate of photosynthesis. Hypothesis The rate of photosynthesis is directly proportional to light intensity but inversely proportional to
The wavelength of the absorption maximum for the chlorophylls are red and blue. The wavelengths of absorption maximum for the other three carotenoids is blue-green. Shown in the graph below. The reason why plants have more than one or more pigments is because chlorophyll has a small range of light that it captures. So it needs to pair up with other pigments that captures the wavelengths of light that chlorophyll misses especially the blue spectra and another function of these other pigments is to protect the leave from UV damage, an example for this kind of pigment is Xanthophyll.
They also promote the production of other hormones and in conjunction with cytokinins, they control the growth of stems, roots, and fruits, and convert stems into flowers. Auxins were the first class of growth regulators discovered. They affect cell elongation by altering cell wall plasticity. They stimulate cambium, a subtype of meristem cells, to divide and in stems cause secondary xylem to differentiate. Auxins act to inhibit the growth of buds lower down the stems (apical dominance), and also to promote lateral and adventitious root development and
One example would be colourful petals on flowering plants. When colourful petals develop in plants it is a sign of sexual maturity and means that the sexual organs of the plant are producing gametes. The colour of the flowers attracts insects that are a vector for the pollen to be transported to other individuals so reproduction can occur. The reason for plants reproducing with other individuals is allows alleles to be spread around the population, this allows for possible resistances to diseases or infections to be passed around the population. Another example of this would be in fruits and vegetables where the colours of the seed-containing vector remain dull until sexual maturity is reached and new, brighter pigments begin to be produced, these bright colours attract animals to ingest the fruit.
They harness their energy form the sun to carry out photosynthesis (Miller and Levine) However, other things are needed to do photosynthesis as well. Carbon dioxide and water are the key components to process photosynthesis. Chloroplast makes photosynthesis happen. They are organelle, or a specialized structure that performs important task in the plant cell. Cell in the plants co-operate to help
Title Which frequencies and type of light aided and affected the efficiency of photosynthesis or carbon dioxide consumption in a spinach leaf? Purpose The purpose of the experiment/lab was to observe the effectiveness of different lights during the process of photosynthesis. Background Photosynthesis is a biological process. It occurs in plants, algae and specified bacteria (prokaryotes). Photosynthesis is the process where plants, algae, and bacteria convert light energy into chemical energy.
Research Question: How does the presence of light impact the rate of transpiration in plants? Aim: The aim of this experiment was to investigate how the presence of light affects the rate of transpiration in plants. Hypothesis: As light intensity increases, the rate of transpiration (water uptake) in a plant increases. Background Information: In this experiment I will be investigating the impact of light intensity on the rate of water uptake, due to transpiration, by attaching a shoot from a leafy plant in the capillary tube of a potometer, and then measuring how long it takes for a bubble to move a set distance. The faster the bubble moves, the greater the rate of transpiration.
By looking at this graph you can notice that while the human eye has the strongest response in the yellow/green section of the light spectrum (600nm), plants respond more to the blue and red. The duration, the direction and the spectral quality of the light impact the rate of photosynthesis of the plants. Plants are highly responsive to the conditions of the environment surrounding them, which is why plants raised in greenhouses, under grow-light bulbs, might look different from plants grown outside
SCHOOL OF MOLECULAR AND LIFE SCIENCES LESAILANE M 201505020 BOTANY ASSIGNMENT 1 28/JULY/2017 INTRODUCTION Plants have evolved mechanisms to avoid self-pollination which brings about inbreeding, cross pollination is encouraged. It is of crucial importance that not only does a plant grow to its maturity stage, but also that it should produce fertile offspring and ensure that it maintains genetic continuity of the plant population. Plants are immobile organisms, so they need pollinating vectors to help them transfer pollen from the anthers to the stigma of different flowers, in order to ensure cross-pollination. Animal pollinators are of a huge importance in the production of various ﬂowering plants. Interspeciﬁc pollen transfer