Biological characteristics of Angelica sinensis (3)

The main results are as follows: (1) bolting and flowering Angelica sinensis is an one-time flowering plant, and under normal cultivation conditions, the third year enters the bolting and flowering stage, and about half a month after the plant turns green, the growth point begins to change from the vegetative growth state to the reproductive growth state, forming the reproductive growth point. its tip gradually produces some protuberances, namely inflorescence primordia. With the elongation and growth of inflorescence primordia, each primordium begins to widen and produce several small protuberances, that is, small sequence primordia, which form the embryonic form of compound umbels. At the same time, the basal stem expands and grows, forming internodes and forming the embryonic form of the stem. After the small inflorescence primordium is elongated and widened at the top, some small protuberances are produced at the top, that is, the flower primordium, which successively develops into calyx, petals, stamens and pistils, forming flowers. At this time, the stem nodes began to enter the elongation stage, the internodes grew rapidly and extended to the ground, entered the bolting stage, flowered from June to July and fruited from July to August.

(2) the stamens of Angelica sinensis during fertilization include filaments and anthers. When the stamens develop to a certain period, the pollen sac in the anther produces many pollen grains, which produce sperm when they mature. The pistil consists of three parts: stigma, style and ovary. Ovary inferior, 2-loculed, with ovules in it. When the ovary and anthers are mature, they begin to bloom, when the filaments elongate rapidly, the anthers protrude out of the flowers and scatter pollen grains, a small part of which falls on the same flower stigma and self-pollination occurs, and the other part falls on other florets of the same plant or different plants to produce cross-pollination. June to July is the peak period of flowering and pollination.

Angelica needs sunny and breezy weather during flowering and fertilization, and the relative humidity of the atmosphere is about 70-80%. Too high temperature or too low humidity will cause physiological drought of pistils and stamens and lose their ability to fertilize, thus reducing the seed setting rate. In addition, in the event of rain during flowering, it is easy to make the pollen grains absorb too much water and break or enter the ground with Rain Water, which will also affect fertilization and reduce the seed setting rate.

(3) after fruit formation and ripening, the fertilized ovules develop into seeds, and the malfertilized or undernourished ovules shrink into blighted grains after flowering and pollination. Then the dry matter in Angelica seeds began to accumulate, and the fruit matured in mid-late August, forming a wide oval double hanging fruit.