Due to long-term adaptation to different light cycles, some plants need to bloom under long-day conditions, while others need flowers under short-day conditions. Using the integrator for experiments, the plants can be divided into the following three categories based on the plant's differential response to the photoperiod:
1. A long-day plant is a plant that grows when the length of sunshine exceeds a critical length, that is, a plant whose light length must exceed a certain number of hours (this time is called the critical day length) before it can bloom. When the length of sunshine is not enough, only vegetative growth can occur, and no fen can be formed. The flowering of such plants is usually in the season of long sunshine hours in a year. Such as impatiens, Dianpu, hanging upside down, lotus, lotus, bellflower, pyrethrum, wheat, rape, radish, spinach, beet, commercial, artichoke, garlic, peas, etc., artificially prolonged hours of light can be Make early flowering. And the longer the light hours, the earlier the flowering. Otherwise it will maintain vegetative state without flowering.
2. Short-day plants are plants that bloom when the length of sunshine is shorter than the critical point. Most of the plants that normally bloom in late autumn or early spring are of this type, such as this barley, poinsettia, chrysanthemum, crab grass, ground beef root, a string of red, Yingrong, Xanthium, chrysanthemum and rice, Daman, sorghum, millet , cotton, sweet potatoes, etc., artificially shorten the light time, can make this type of plant bloom in advance. And the longer the dark hours, the earlier the flowering. Under long days only vegetative growth can occur without flowering.
3. A neutral-neutral plant is a plant that is sensitive to the duration of light exposure whether flowering or not, as long as the temperature, humidity, and other growth conditions are appropriate, plants that can flower. Such as rose, Xiangshi, Zisheng, dahlia, cyclamen, dandelion, Fanbei, cucumber, four seasons and so on. Such plants are less affected by the length of the sunshine.
The critical value of the length of the shortest daylight of the longest member that plants can flower through the photoperiod is called the critical day length. For short-day plants, it refers to the longest length of sunshine required for flowering, and for short plants it refers to the shortest length of sunshine required for flowering. It is generally believed that the critical day length is 12-14 hours light daily. This is not actually the case with any plant. Apricot's sun-dried shoots are like Xanthium, and the critical day length can be as long as 15.5 hours, while some long-day plants increase the fairy and the critical R-length is only 12 hours. Each type of plant has its own critical point length, which does not necessarily require long hours of sunshine for plants that are longer than short-day plants. For example, the critical day length of the long-day spinach plant spinach is 13h, which is to say, they need to be lighted in more than 13h light, and they can't flower in less than 13h; the critical day length of the short-day plant chrysanthemum (most varieties) is 15h , as long as the sunshine hours does not exceed 15h, chrysanthemum can bloom. Therefore, long-day plants can bloom only if the sunshine duration is longer than the critical day length, while short-day plants can bloom only if the sunshine duration is shorter than the critical point length.
The response of plants to the light period is an adaptation of the length of sunshine during the process of the plant's naturalization, and to a large extent is related to the latitude in which the young primordium is strictly located. Long-daylight plants are mostly plants that are native to high latitudes, and short-daylight plants are mostly plants that originate at low latitudes. In the introduction process, the response of plants to the length of sunshine must be considered.
1. A long-day plant is a plant that grows when the length of sunshine exceeds a critical length, that is, a plant whose light length must exceed a certain number of hours (this time is called the critical day length) before it can bloom. When the length of sunshine is not enough, only vegetative growth can occur, and no fen can be formed. The flowering of such plants is usually in the season of long sunshine hours in a year. Such as impatiens, Dianpu, hanging upside down, lotus, lotus, bellflower, pyrethrum, wheat, rape, radish, spinach, beet, commercial, artichoke, garlic, peas, etc., artificially prolonged hours of light can be Make early flowering. And the longer the light hours, the earlier the flowering. Otherwise it will maintain vegetative state without flowering.
2. Short-day plants are plants that bloom when the length of sunshine is shorter than the critical point. Most of the plants that normally bloom in late autumn or early spring are of this type, such as this barley, poinsettia, chrysanthemum, crab grass, ground beef root, a string of red, Yingrong, Xanthium, chrysanthemum and rice, Daman, sorghum, millet , cotton, sweet potatoes, etc., artificially shorten the light time, can make this type of plant bloom in advance. And the longer the dark hours, the earlier the flowering. Under long days only vegetative growth can occur without flowering.
3. A neutral-neutral plant is a plant that is sensitive to the duration of light exposure whether flowering or not, as long as the temperature, humidity, and other growth conditions are appropriate, plants that can flower. Such as rose, Xiangshi, Zisheng, dahlia, cyclamen, dandelion, Fanbei, cucumber, four seasons and so on. Such plants are less affected by the length of the sunshine.
The critical value of the length of the shortest daylight of the longest member that plants can flower through the photoperiod is called the critical day length. For short-day plants, it refers to the longest length of sunshine required for flowering, and for short plants it refers to the shortest length of sunshine required for flowering. It is generally believed that the critical day length is 12-14 hours light daily. This is not actually the case with any plant. Apricot's sun-dried shoots are like Xanthium, and the critical day length can be as long as 15.5 hours, while some long-day plants increase the fairy and the critical R-length is only 12 hours. Each type of plant has its own critical point length, which does not necessarily require long hours of sunshine for plants that are longer than short-day plants. For example, the critical day length of the long-day spinach plant spinach is 13h, which is to say, they need to be lighted in more than 13h light, and they can't flower in less than 13h; the critical day length of the short-day plant chrysanthemum (most varieties) is 15h , as long as the sunshine hours does not exceed 15h, chrysanthemum can bloom. Therefore, long-day plants can bloom only if the sunshine duration is longer than the critical day length, while short-day plants can bloom only if the sunshine duration is shorter than the critical point length.
The response of plants to the light period is an adaptation of the length of sunshine during the process of the plant's naturalization, and to a large extent is related to the latitude in which the young primordium is strictly located. Long-daylight plants are mostly plants that are native to high latitudes, and short-daylight plants are mostly plants that originate at low latitudes. In the introduction process, the response of plants to the length of sunshine must be considered.
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