Which plants cell phablet has genetic material of its own?
Answers
*Chloroplasts of the plant cells possess their own DNA. This DNA is responsible for the regreening capacity of the plant. The chloroplast DNA degrades at the early period of senescence. Hence, aged plants and leaves cannot regain their regreening capacity.
*Mitochondria of the cells also possess their own DNA. which also is included in the amount of total DNA of the cell. This mt-DNA is very important in synthesis of the enzymes which are responsible for the process of oxidative phosphorylation involved in the production of energy.
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Introduction of Genetic Material Into Plant Cells
A Caplan et al. Science. 1983.
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Abstract
The tumor-inducing (Ti) plasmid of the soil microorganism Agrobacterium tumefaciens is the agent of crown gall disease in dicotyledonous plants. The Ti plasmid contains two regions that are essential for the production of transformed cells. One of these regions, termed transfer DNA, induces tumor formation and is found in all established plant tumor lines; the other, termed the virulence region, is essential for the formation but not the maintenance of tumors. Transfer DNA, which transfers to the plant genomes in a somewhat predictable manner, can be increased in size by the insertion of foreign DNA without its transferring ability being affected. The tumor-causing genes can be removed so that they no longer interfere with normal plant growth and differentiation. This modified Ti plasmid can thus be used as a vector for the transfer of foreign genes into plants.