A mutant version of mouse-ear cress (Arabidopsis thaliana) has been engineered to convert it from a long-day plant to a short-day plant. What is responsible for triggering the development of flowers in this plant

Long And Short-Day Plants

Explanation:

Long-day Plants-

A plant that flowers simply subsequent to being presented to light periods longer than a specific basic length, as in summer. Spinach, lettuce, and a few assortments of wheat are difficult day plants. Look at day-unbiased plant short-day plant at phototropism.  Long  plants include such as  aster, cone flower,radish ,potato,hibiscus, cone flower, lettuce, spinach and  sugar beet.

Short-day plants-

A plant that requires a significant stretch of obscurity, is named a "brief day" (difficult night) plant..Short-day plants structure blossoms just when day length is not exactly around 12 hours.The fall flowering  plants and many spring are whole  day plants, such as  poinsettias and Christmas Christmas cactus and chrysanthemums.

It would be the equator.