the Role of light and temperature in growth and development regulation. The photoperiodic control of flowering

you are: the Role of light and temperature in growth and development regulation

As we saw in gl. 12, flowering of many plants is regulated in the length of day with the assistance of phytochrome and endogennyh rhythms. gardeners use it for management of flowering of some valuable kinds of plants to deliver them on the market during favorable time. For example, chrysanthemums - korotkodnevnye plants; in the nature they blossom at reduction of length of day in the autumn. Placing over plants a source of artificial light, it is possible to prevent their flowering. 6 weeks prior to sale of plants artificial light switch off, and if natural days short, flowering will be initiated. thus it is possible to receive flowers throughout all winter. TSvetki chrysanthemums can be received also in the summer, closing plants from light on a certain part of day.

Though is almost usually inexpedient to use light for regulation of flowering of agricultural crops in an open field, this reception has appeared useful at sugar cane cultivation at which sugar is reserved only before flowering. at formation tsvetkov and fruits the sugar part turns in seeds to starch. Flowering of some lines is induced in the short days, and in these cases zatsvetanie it is possible to delay by interruption of long night by short-term influence of light. It can be carried out, shining crops by a projector during the short period every night. unfortunately, cost of such reception limits its application.