| 单词 | primary endosperm nucleus |
| 释义 | > as lemmasprimary endosperm nucleus primary endosperm nucleus n. Botany the triploid nucleus which results from the fusion of the two polar nuclei of the embryo sac with a sperm nucleus, and which (usually) divides to form the endosperm tissue. ΘΚΠ the world > plants > part of plant > cell or aggregate tissue > [noun] > cell > parts of cell > other parts disc1835 crystalloid1863 autoplast1884 plastid1885 granum1894 primary endosperm nucleus1897 chromoplast1902 phragmoplast1904 plasmodesma1905 phragmosome1940 1897 Bot. Gaz. 23 147 There is no primary endosperm nucleus formed by the fusion of polar nuclei, but an endosperm formed before fertilization. 1938 H. E. Hayward Struct. Econ. Plants 137 This [fertilization] is double in character, one microgamete uniting with the megagamete to form the zygote, the other with the polar nuclei to form the primary endosperm nucleus. 2004 Plant Sci. 167 575/1 Double fertilization results in the dipoid zygote, which develops into the embryo and the triploid primary endosperm nucleus, developing into the endosperm. < as lemmas |
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