Question

is there any dna in chloroplast and how is it function?

Answer 1

The material within the chloroplast is called the stroma, corresponding to the cytosol of the original bacterium, and contains one or more molecules of small circular DNA. It also contains ribosomes; however most of its proteins are encoded by genes contained in the host cell nucleus, with the protein products transported to the chloroplast.

Chloroplasts contain genetic information. The significance of their genes was first understood in the early works of E. BAUR (1909) and C. CORRENS (1909). The molecular genetic phase of research started in 1962 with the definitive proof of DNA in chloroplasts (H. RIS and W. PLAUT, University of Wisconsin, Madison). Chloroplast DNA (ctDNA) is circular. Although it contains information about the formation of a whole lot of chloroplast proteins exist by far more proteins in chloroplasts than encoded by the ctDNA:

100 genes alone would be required for the DNA and protein synthesis in chloroplasts (DNA polymerases, RNA-polymerases, rRNA, ribosomal proteins, tRNA, aminoacyl-tRNA-synthethases, soluble factors). 40 additional enzymes are needed for the synthesis of chlorophyll and carotenoids and again 40 enzymes take part in the other activities of photosynthesis. As far as the figures go could the chloroplast DNA contain just enough genes for all these enzymes. In nearly all examined higher plants does it contain about 150 000 base pairs.

Answer 2

The chloroplast has its own DNA, which codes for redox proteins involved in electron transport in photosynthesis; this is termed the plastome.
The plastome is the genetic material that is found in plastids in plant cells (for example in the chloroplast). It composes part of the entire genome of photosynthetic organisms.
(from wikipedia)