central part of a plant ovule; contains the embryo sac

there are many wall ingrowths in the boundary wall between endosperm and degenerated nucellus, which is benefit to the material transport from degenerated nucellus to endosperm.

胚乳与珠心组织分界壁-胚囊壁上有发达的壁内突，有利于珠心组织内的物质向胚乳内转运；

about 4 weeks after pollination, the tip cells of nucellus broke and secreted liquid into ovular canal, which promoted pollen movement to the nucellus and played important role for pollen germination.

传粉后约4周，珠心顶端破裂，分泌物进入珠孔道，并与珠被分泌物共同作用于花粉，使花粉向珠心移动。

the archesporial cell below nucellus epiderm functions directly as the megaspore mother cell.

珠心表皮下的雌性孢原直接发育为大孢子母细胞。

upon further increase of the exogenous hormone concentration, new ovule primordia could be formed from the proliferated nucellus cells, which further developed into many new ovules.

进一步提高外源激素浓度，珠心细胞又可以分化出新的胚珠原基，进一步长大以后发育成许多新的胚珠。

after years of observation and assessment on the top-grafting plants of nucellus seedlings, considerable quality variations were found among nucellus embryo plants.

对珠心苗高接植株多年观察及品质鑒定，认为珠心胚植株在品质上表现较大差异。

about weeks after pollination, the tip cells of nucellus broke and secreted liquid into ovular canal, which promoted pollen movement to the nucellus and played important role for pollen germination.

传粉后约周 ，珠心顶端破裂 ，分泌物进入珠孔道 ，并与珠被分泌物共同作用于花粉 ，使花粉向珠心移动。

the main cause of the incompatibility between p. koraiensis and p. tabulaeformis is the pollen of p. tabulaeformis showing poor or no germination in the nucellus of p. koraiensis.

红松和油松杂交不孕的主要原因是，油松的花粉不能在红松的珠心上发芽。

there were only two layers of nucellus which had abundant cytoplasm and reserved substance, and were consumed at the stage of late heart-shaped embryo.

珠心细胞只有两层，细胞核大，胞质丰富，内含贮藏物质，至心形胚期逐渐解体。

at early developing stage, the endosperm tissue has a projection that inserts nucellus tissue in the antipodal cells.

发育初期的胚乳组织在反足极有一突起，并插入珠心组织。

this mass, which connected the haustorium with nucellus was likely to be as an active functional unit of haustorium.

胚乳细胞质团追接胚乳吸器和外侧的珠心组织，它可能是胚乳吸器一个活跃的功能单位。