It's caused by expression of genes. See:

Article Leaf-Like Sepals Induced by Ectopic Expression of a SHORT VE...

Hi mr Andrew

Thanks for attention. Would you please clarify it for me more.

It could be MITES infetion

Hi, This is phytoplasma symptoms on cucumber,

find this link

https://pdfs.semanticscholar.org/ad3c/23a7c38878d3bde6fe8fbea2052089cb4046.pdf

I recommended you to take it off your greenhouse and burial it.

Article Characterization and vector identification of phytoplasmas a...

Mr oadi. Thanks for your attention. I have an important question. As you have seen all pictures wich i will send you again, in some pictures all flowers cucumber organ have been changed to vegetative organ. So it is certainly caused by phytoplasma. But in one of picture all sepal just have been changed to vegetative organ without any change to other flower organ. In this case is it considerd as phytoplasma or genetic or physiological disorder.

I am looking forward to hear your idea. Please notice to opinio Andrew.

No, it's genetic. Read the article I listed above :)

It may be symptoms of infection with Phytoplasma.

With best wishes.

The infection was associated with the symptoms of clear viral diseases on the leaves in the background of the images. Were some herbicides or insectcides used, did you use fertilizers, I prefer to send other pictures of the whole plant and site,

Following answers.

These symptoms look like abiotic disorders’ symptoms such as genetic or chemical damage. Most probably they are sourced from a kind of herbicide damage.

symptoms of phytoplasma

I think it was symptoms of phytoplasma.

@ Elaheh Gerami

It is cucumber phyllody disease. Please take a look at this useful RG link.

Article Characterization and vector identification of phytoplasmas a...

Thanks!

I believe Arvind Singh is right.