The flowering of Ho Diep orchids

Currently, while neighboring Thailand and Taiwan have been very successful in their orchid industry, the Vietnamese still only do business with passive orchids. That means they just wait for the flowers to bloom, if it is near the holiday, then if it is in the normal days, the flowers bloom too much, they will bury the market because they cannot sell them. Especially for Ho Diep orchids, a orchid of high commercial value, but it is very difficult to grow and control.

(Photo: mytho-fleurs) Referring to Ho Diep is referring to Taiwan, a growing country with the world's leading orchid cultivation technique with the ability to grow Phyllantus stems, control flowering . and collection. Extremely massive breed.

Ho Diep flower control technique is now Taiwanese technological know-how. With only the temperature control method, they can stimulate Ho Diep to create flowers with almost absolute efficiency.

The development stages of Phalaenopsis in greenhouses can be divided into the main stages based on the following temperatures:

The first stage : (Lasting 22-27 weeks) is the stage of development from the plant in vitro until the middle tree becomes. The most important time period during this period is when the seedlings are released, it is necessary to avoid changing the living conditions of the plants too suddenly.

Development stage : (lasts 22-27 weeks) Phytoplankton grows vegetatively, the temperature for this period ranges from 28 to 32o C. High temperature just increases the ability of Ho Diep's relationship and, at the same time, limit the unnecessary early flowering during this period of convalescence. According to K. Kataoka et al., The period before flowering requires very high carbohydrate content, which also means that if flowering occurs when the plant is not strong enough, the quality of the flower will not be high or damage to the mother tree.

Period of welding : (lasts 4-6 weeks) Induction of flowers in Ho Diep needs to react to mild water stress in low temperature, from 17 to 25 ^o C. At this temperature, endogenous Cytokinin content in leaves increases up, contrary to Abscisic acid content (Wen Yu Wang et al., 2002). In addition, according to Wang's 2003 study, the amount and content of leaf tissue increased significantly during this period. This suggests that the flowering reaction to reach the optimal level should occur in cold conditions, many other experimental studies have also said this. The flowering stage finishes when most of the plants handle create young flowers about 2-5cm.

Ending stage : (Lasting 8

(Photo: eorchids.org)

-15 weeks) After the Phalaenopsis plant has 4 to 6 leaves and the leaf width is about 25cm, the plant is put into the flowering stage, the processing temperature is in the range of 17-26 ^o C. During this period, The goal of the grower is to extend the flowering, increase the number of flowers, control the flowers to bloom simultaneously and the flowers rotate evenly along the flowering axis. This stage can be divided into 3 smaller stages. First, flower inflorescence should be prolonged at a high temperature (26 ^o C) for a short period of time, then transferred to a lower temperature (17-25 ^o C) to induce reproductive buds, minimize darkness. most vegetative buds. Immediately after a certain number of buds are formed, to make the flower blossom evenly, the temperature continues to decrease to about 19-20 ^o C to extend the flowering time of the flowers below, facilitating For the above flowers continue to grow and sprout petals in the same short period of time.

The temperature during the flowering process if it exceeds 26 ^o C can directly affect the flowering, peaking or reducing the number of flowers.

Effect of temperature on average time to bloom.

Temperature (C) ------ The time from when the flower comes to the first flower blooms (day)
14 ------------------------------- 266
17 ------------------------------- 133
20 -------------------------------- 87
23 -------------------------------- 68
26 -------------------------------- 52

Light during the growth of Phalaenopsis is about 500-1500 footcandles, which is relatively high compared to most other orchid species (though the plant does not tolerate direct light). However, compared to temperature, light does not affect the flowering of Ho Diep very much, it is only important for the nutrient accumulation factor through photosynthesis and affect the photodynamic properties of flowers.

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References:

Matthew Blanchard, Roberto lopez, Erik Runkle, Yin-Tung Wang. 2005. The Orchid Grower. Green house Grower Publish (4) 86-89.

Wen Yu Wang, Wen Shaw Chen, Kuan Liang HuangLi Sang Hung, Wen Huei Chen, Wei Ren Su.2003.The effect of daylength on protein synthesis and flowering on doritis pulcherima. Sciencetia Hor 97: 49-56.

Wen-Yu Wang, Wen-Shaw Chen, Wen-Huei Chen, Li-Sang Hung, Ping-Shun Chang. 2002
Influence of abscisic acid on flowering in phalaenopsis hybrida. Plant physiol. Biochem (40) 97-100.

K. Kataoka., K. Sumitomo, T. Fudano, K. Kawase.2004. Changes in sugar content of Phalaenopsis leaves before transition flowers (102);121-132.

Nguyen Huu Hoang