Effects of plant growth regulators on development, Biology

Effects of Plant Growth Regulators on Development

Like animals plants require input of energy from the outside environment to sustain growth and development. But unlike animals, plants can draw energy directly from sunlight and by using water and a few essential mineral nutrients from soil, can synthesize the molecules that constitute their structure and function (autotrophic). There are parasites, semi-parasites, saprophytes and insectivorous plants which are exceptional to this generation There are certain physical factors like light, temperature, gravity and touch which trigger one or other physiological processes like flowering, germination, chlorophyll development etc. or modify the pattern and direction of growth e.g. phototropism, geotropism and hydrotropism responses. There are also certain chemical substances endogenously present in plants which at a very low concentration initiate a particular physiological process like enhancement of production of a-amylase in barley seed endosperm or acceleration of a specific m-RNA or initiation of a major physiological process-involving number of specific steps like germination, flowering, senescence, etc. There are just five plant growth regulators in plants.

They are auxins, gibberellins, abscisic acid, cytokinins and ethylene. They are also called as plant hormones. But, the term hormone is in fact borrowed from animal, as hormones were first discovered and ' well characterized in animal systems. Unlike in the case of animals, each one of these five groups of 'plant hormones' can influence/ initiate a number of physiological processes. The same hormone can promote growth at one concentration and retard growth at some other concentration in the case of same organ like a shoot, bud, root etc. Same physiological process like germination can be influenced positively by two different types of hormones (gibberellins and cytokinins). Plant physiologists have recommended the use of the phrase "plant growth regulators" (PGRs) to these compounds.These are naturally occurring as well as synthetic compounds which can be included under PGRs. Some scientists call the former as hormones. In recent times there is much discussion whether the term hormone should be used for plants as plant and animal hormones are markedly different in their origin, structure and mode of action.

Posted Date: 1/24/2013 1:58:55 AM | Location : United States

Related Discussions:- Effects of plant growth regulators on development, Assignment Help, Ask Question on Effects of plant growth regulators on development, Get Answer, Expert's Help, Effects of plant growth regulators on development Discussions

Write discussion on Effects of plant growth regulators on development
Your posts are moderated
Related Questions
Assume that after washing your hands, you leave ten bacteria cells on a new bar of soap. You then decide to do a plate count of the soap after it was left in the soap dish for 24 h

Indinavir (IDV, Crixivan) Indinavir has good oral bioavailability. Indinavir 800 mg combined with ritonavir 100 mg  (both b.i.d. for ease of use) was comparable in effectiven

what the advantage of yersinia pestis

economic importance of the phylum protozoa

Kangroo Rat Kangroo rat Dipodornys merriami, a native of South-West America is a classical example of how small mammals survive in desert. It exhibits all the osmoregulatoryad

Artificial Parthenogenesis In various cases, the eggs that normally develop only after fertilisation can be experimentally induced to develop parthenogenetically by specific

Oxygen Dissociation Curves The oxygen content of blood fully saturated or oxygenated can be calculated. It is known as the oxygen capacity of blood and this varies for differe

Define Requirements of Fluid in Postoperative Nutritional Care Extensive fluid losses may occur through vomiting, haemorrhage, diesis, excudate, fever and sweating after a surg

What's the difference between theory and hypothesis and explain the importance for a hypothesis to be testable and falsifiable in order for the scientific method to be applied?

Explain about the Glycemia or Insulinemia? Preliminary research evidence indicates that there may be beneficial effects in terms of decreased fasting blood glucose/hepatic gluc