The germination of rhododendron seeds

Rhododendron is a world-famous flower, known as the “flower in the west”, and one of the top ten traditional famous flowers in China. The wild azalea resources are very rich. There are about 900 species in the world. About 600 species in China account for half of the world azalea resources. the above. Rhododendron has a long history of cultivation and has high ornamental and application value. It can be used as garden ornamental plants in urban garden construction, and can also be used as bonsai and potted plants for indoor decoration. Rhododendron is the soul of modern European garden landscaping It can be said that without azaleas, there would be no European gardens. Rhododendrons first entered the sight of Europeans when the British Hook published the color original rhododendron catalog of “Sikkim-Himalayan Rhododendron” in 1850. The publication of this book has produced no less than an atomic bomb for the European gardening community. After an explosive sensation, a large number of plant hunters went to the Himalayas to explore and search for rhododendrons. Among them, the most productive of them was the British Fu Lishi. He visited China’s southwestern provinces and Burma several times from 1904 to 1931 and found There are hundreds of new species of azaleas. These discoveries have also established Southwest my country’s position as the birthplace of rhododendrons in the world. The most dazzling one is Guizhou Baili rhododendron, which is the largest natural rhododendron forest found in the world and the kingdom of rhododendron resources.

When the colorful and magnificent Rhododendron forest gives you a visual feast, you know that the growth process of each Rhododendron tree is very difficult, just the seed germination process is just like the Tang monk’s western sky learning. One difficulty, the first one of these many disasters is to solve the problem of weak seeds. Rhododendrons are mostly capsules. There are more seeds in each fruit, but the weight of each seed is very light, less than 0.5g, and the thin seeds germinate. The nutrients it carries cannot support its growth, so its demand for external nutrients is particularly prominent. It is not so easy for this weak seed to find a suitable germination environment. The fallen leaves of the big tree are its first barrier. The vast majority of seeds are blocked by the litter on the soil after they fall. These are not rotted. Litter can’t provide the necessary nutrients, temperature and humidity guarantee for seed germination. The poor seed will end without finding a suitable home. Even if those lucky seeds are fortunate enough to escape the obstacles of the litter, they may not get the affectionate embrace of the soil. Usually there is a humic layer of varying thickness under the litter, which is decomposed and decomposed by microorganisms. The humus formed is not so friendly. They usually release a lot of organic substances. Among them, long-chain fatty acids, organic acids, phenolic acids and alcohols will inhibit the germination of seeds.

After avoiding the physical obstacles of the litter and the chemical difficulties of the humic layer, the rhododendron seeds that find the ideal germination site do not germinate immediately, but also need to survive their own biological problem-the dormant period. During the dormant period, species such as Rhododendron azalea, Rhododendron fortunei, Rhododendron arborescens, Rhododendron sylvestris, and other species need to synthesize enough hormones to promote germination. Among them, gibberellin plays a key role in seed germination; Rhododendron lantana and Rhododendron redstone Rhododendron, Rhododendron sylvestris, Rhododendron taipingensis and Rhododendron khingan need to wait for the arrival of spring, and suitable temperature and light stimulate seed germination; Rhododendron sibiricum, Rhododendron vulgaris, and Rhododendron lantana need time to remove the wax from the seed coat. The stratum layer is slowly decomposed to ensure that the moisture and air in the external environment can smoothly enter the inside of the seed to meet the respiration of the seed and the development of the embryo.

After various catastrophes from withering to germination, the seedlings broke out to meet the nourishment of sunlight and rain, but this is not the final victory, but the beginning of new challenges, such as drought, waterlogging, pests, and diseases. The challenges of this environment surround us all the time. But the rhododendron continues to meet challenges and overcome difficulties with tenacious vitality, and finally squeezes out the dense forest to bloom flowers. Any life in nature is observing the laws of nature, and sometimes human beings, with the blessing of various tools, constantly challenge the laws of nature, destroy the laws of nature, and strip away the rights and space of other life. Protecting nature is not only protecting the common space on which we live, but also giving a tenacious creature like Du Juan a chance to show itself!