论文部分内容阅读
国内外对裸子植物中松柏目植物的受精过程和胚胎发育研究不少,研究材料证明从传粉开始到受精,中间需要一个时期,不同树种长短不一,如松属需13个月,金钱松属2个月,南洋杉6个月,落羽松3个月,紫杉1个月,水杉约3个半月。传粉至受精作用之间为期如此之长,在这期间,环境条件的突然变化或者雌、雄配子体发育不健全,停止在发育的某阶段,都会影响胚珠的正常发育,不能受精,不能形成胚。有些树种如水杉,在受精以后,形成发育完全的种子很少,多数胚珠在胚胎发育过程中会发生败育现象而导致瘪籽。杉木Cunninghamia lanceolata(La-mb)Hook授粉生物学特性研究方面的材
At home and abroad, many studies have been done on the process of fertilization and embryo development of the coniferous plants in gymnosperms. The research materials prove that it takes a period of time from the start of pollination to the time of fertilization. The lengths of the different tree species are different, for example, 13 months for Pinus, 2 months, Araucaria 6 months, 3 months of pine needles, yew 1 month, metasequoia about 3 and a half months. During the period between pollination and fertilization, there is such a long period during which sudden changes in environmental conditions or the development of female and male gametocytes are not well established. Stops in one stage of development will affect the normal development of ovules, and can not fertilize or form embryos. Some species such as Metasequoia, after fertilization, the formation of fully developed seeds is very small, the majority of ovules in the embryonic development process will result in abortion phenomenon caused shriveled seeds. Chinese fir Cunninghamia lanceolata (La-mb) Hook pollination biology research material