Molecular genetics and plant growth hormone, Biology

Molecular Genetics and Plant Growth Hormone

Molecular genetics has advanced over the last three decades by leaps and bounds, providing knowledge regarding the control of developmental events nucleic acids and proteins. Further, scientists have perfected techniques in identification, isolation, sequencing of genes, their transplantation into new hosts, production of transgenic crops, so on so forth. It is no wondered that there is a temptation to make use of all this in plant hormone studies also. Following are the various aspects of these studies: a) Mutant varieties in various plant species which are identified for over production or under production of a given plant hormone are being isolated from nature or sometimes these mutants are produced through mutation breeding techniques.

Studies on phenotypic nature of these mutants would throw new light on the fact how far our earlier assumptions on the physiological responses of various plant hormones are correct or not. Mutants which are deficient in the production of particular hormone step in biosynthetic pathway are also found. Studies of these mutants are helping us in understanding the intricacies of biosynthetic pathways of hormones. Mutants which fail to show a particular physiological response to a given hormone (E.g. cytokinin retards leaf senescence, promotes leaf expansion, promotes chlorophyll biosynthesis etc., in wheat).

There can be one wheat mutant that shows all other responses except leaf senescence. Identification of genes that produce these hormones, cloning them and transplanting them in some other plants also helps us a good deal in knowing the interaction of hormones. Changes in the levels of molecules like m-RNA i.e. in terms of total quantity or quality i.e. how many new species of m - RNA etc. are being followed in cells exposed to hormones over the last two decades. These studies have given new information about hormonal effects at transcriptional and post-transcriptional levels. Observations have shown that polyribosomes formation is higher in cytokinin treated cells. Auxins stimulate both production of ribosomal RNA and m-RNA meant for ribosomal proteins. ABA has shown to cause deactivation of ribosomes. GA3 treated cells show enhancement of ribosomal activity.

Posted Date: 1/24/2013 2:56:29 AM | Location : United States

Related Discussions:- Molecular genetics and plant growth hormone, Assignment Help, Ask Question on Molecular genetics and plant growth hormone, Get Answer, Expert's Help, Molecular genetics and plant growth hormone Discussions

Write discussion on Molecular genetics and plant growth hormone
Your posts are moderated
Related Questions
What is Self-jamming Unless all of the mobile client are perfectly synchronized, the arriving transmissions from multiple clients will not be perfectly aligned on chip boundari

Aeolian Wind transported materials constitute this category. This can be further divided into dunes or loess. Dunes are found in thr& types of situations. Fitly, these may occu

Q. What are cerebrospinal and meninges fluid? Meninges are the membranes that protect and the enclose central nervous system (CNS). Cerebrospinal fluid is the fluid that separa

Although there are differences in interpretation of the evidence, it is generally accepted that human biological evolution has not been a linear progression from one species to the

What is the part of the female reproductive system where fecundation occurs? Fecundation generally happens in the Fallopian tubes but it can also take place within the uterus.

Q. What do you mean by Punch cards? Punch cards are used when the number of taxa to be keyed out is large. In this type of cards the holes at numbers corresponding to a charact

Armamentarium 1. Denture duplicator or a modified plastic soapdish. (A plastic large soapdish with a base and cover can be adapted by drilling 2 mm holes interspersed and cover

Question : (a) Briefly describe what are non degradable pollutants? (b) What do you meant by ichthyosarcotoxic fishes and give two examples of ichthyosarcotoxic fish poiso

Cytology: The study of form or culture including the behavior of nucleus and other organelles is called cytology. Cytology means "the study of cells". Cytology is the branch of lif

Megasporogenesis One of the nucellar cells situated subjacent to the epidermis differentiates into the primary archesporial cell. This cell is larger than the adjacent ce