Development of the endosperm in rice (Oryza sativa L): Cellularization
Development of the endosperm in rice (Oryza sativa L): Cellularization
复制标题
DOI：
10.1007/bf02344477
复制
发表时间：
1996-09-01
影响因子：
2.8
通讯作者：
Olsen, OA
中科院分区：
文献类型：
--
作者：
Brown, RC;Lemmon, BE;Olsen, OA
水稻合胞体胚乳细胞化过程遵循一定的形态发生规律。授粉后第3天（dap），外周合胞体的有丝分裂停止。从间期核发出的放射状微管系统定义了核质结构域（NCD），其轴垂直于胚囊壁。相邻NCD之间的自由生长的垂周壁将细胞质分隔成末端开放的肺泡，其被邻近中央液泡的合胞体细胞质覆盖。在4dap，有丝分裂恢复为一个波起源于邻近的维管束。纺锤体的方向平行于肺泡壁，与区间成膜体相关形成的细胞板导致周壁切断细胞的外围层，并使肺泡的内层向中心移位。新形成的肺泡的极化生长和垂周壁的伸长发生在间期。当第一和第二圆柱体细胞在外周层内被切断时，肺泡中细胞分裂的下一波继续进行。极化生长/垂周壁伸长与周细胞分裂交替的时期重复3-4次，直到颗粒在5dap被填充。
The syncytial endosperm of rice undergoes cellularization according to a regular morphogenetic plan. At 3 days after pollination (dap) mitosis in the peripheral syncytium ceases. Radial systems of microtubules emanating from interphase nuclei define nuclear-cytoplasmic domains (NCDs) which develop axes perpendicular to the embryo sac wall. Free-growing anticlinal walls between adjacent NCDs compartmentalize the cytoplasm into open-ended alveoli which are overtopped by syncytial cytoplasm adjacent to the central vacuole. At 4 dap, mitosis resumes as a wave originating adjacent to the vascular bundle. The spindles are oriented parallel to the alveolar walls and cell plates formed in association with interzonal phragmoplasts result in periclinal walls that cut off a peripheral layer of cells and an inner layer of alveoli displaced toward the center. Polarized growth of the newly formed alveoli and elongation of the anticlinal walls occurs during interphase. The next wave of cell division in the alveoli proceeds as the first and a second cylinder of cells is cut off inside the peripheral layer. The periods of polarized growth/anticlinal wall elongation alternating with periclinal cell division are repeated 3-4 times until the grain is filled by 5 dap.