1. Morphological identification method 1 Look at the angle between the trunk and the main branch: The main branch of the male plant stands upright, the branch angle is about 30 degrees, and the main branch of the female plant branch is sag and flat, and the included angle is about 50 degrees. 2 Look at the leaves: Male plants are deciduous; female plants fall early. 3 Look at the leaf shape: The leaves of female plants are shallow and the male plants are the opposite. 4 Look at the canopy form: The male canopy is formed later, the branches are fewer and weaker, and the level is clear; the canopy of female plants is formed early, with many branches and thick, and the levels are more messy. 5 Look at the length of branches: Male branches are short, usually only 1-2 centimeters; female strains have been extended for many years and the length is about 10 centimeters. 6 Look at the flower buds: The male plants have large, full, and slightly flat flower buds on the top; the female plants have thin, pointed buds. 7 Look at the inflorescence: Male inflorescences are catkins, like mulberry inflorescences; males are long, with forks on top of pedicels, such as matchsticks. 8 Look at the thickness of stems: Male stems are taller and weaker; females are shorter and stronger. 2, bromothymol blue identification method Weigh each sample leaf 1 g, cut into shredded cigarette-like, placed in a clean test tube or conical flask and other containers, add 0.1% bromothymol blue solution 5 ml, in 22- Observe the length of time required for color change at 26°C. If it is a male strain, the solution is dark green after 2-3 minutes, green after 4-6 minutes, yellow-green after 9-10 minutes, and yellow-orange when it is about 20 minutes; if it is a female plant, it is blue-green. It takes about 2-6 hours until the yellow-orange color changes. Ginkgo male trees have stronger respiration than female trees, and their catabolism is more prosperous. They can quickly promote the decomposition of substances in the leaf juice to organic acids, making them more acidic. The blue-green bromothymol blue solution, which is alkaline, will turn yellow when it is acid. Therefore, when the bromothymol blue solution is added, if it is a male plant, it rapidly turns yellow; if it is a female plant, the rate of changing from blue to yellow orange is slow. Morphological identification method is simple and convenient, but it has strong experience and lack of reliability. If the morphological identification method is combined with the bromothymol blue identification method, it is a simple and effective method for early identification of ginkgo genitals, which has a high application value. China Agricultural Network Editor
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