| 词汇 | achene |
| 释义 | BETA Examples of acheneachene isn’t in the Cambridge Dictionary yet. You can help! Five replicates of 40 achenes each were used. The triangular fruit (achene) forms a single seed. Light treatments were inspected weekly for germinated achenes and dark treatments every second week. This allowed placement of eggs at the base of achenes, which was otherwise impossible. Germinated achenes were counted every second day for 4 weeks. Moreover, achenes were exposed to yearly seasonal temperature cycles in the soil in an experimental garden. However, the conditions under which the achenes were cultivated were not described, nor how long it was before embryo differentiation began. Thus, nondormant achenes germinated at relatively high temperatures, and germination was promoted by fluctuating temperatures. Germination of dry-stored achenes was tested at increasing amplitudes of temperature fluctuations, and stratified achenes were germinated at constant temperatures. At collection, flower heads were lightly shaken in a bucket, and achenes (hereafter called seeds) that fell off were used. A thin longitudinal section of each flower or bud was removed with a sharp scalpel to expose achenes. Eggs were then placed amongst the basal section of exposed achenes. The achenes are black, elongated, have a pappus and weigh 0.23 ^ 0.05 mg (n 1⁄4 50) without the pappus. The annual course of dormancy revealed that achenes can germinate throughout the growing season under favourable conditions. Seedling emergence, as a percentage of total achenes sown (bold circles), and daily maximum, mean (dotted line) and minimum soil temperatures are given. Achenes tested in light were inspected weekly for germination, while achenes in the dark treatment were inspected after 8 weeks, at the end of the experiment. We use the more convenient term of 'seed' instead of the more botanically accurate term 'achene'. Moreover, the effect of 12 weeks of cold stratification was similar in achenes that were dry-stored for 4 weeks and in those drystored for 17 months. It is a small pine-like plant, it has flowers that are white or reddish-brown, and the fruit achene grows on it. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The fruit is an achene borne in a spherical cluster. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. |
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