Programmed cell death (PCD): an essential process of cereal seed development and germination.
Programmed cell death (PCD): an essential process of cereal seed development and germination.
复制标题
DOI：
10.3389/fpls.2014.00366
复制
发表时间：
2014
影响因子：
5.6
通讯作者：
Cejudo FJ
中科院分区：
文献类型：
--
作者：
Domínguez F;Cejudo FJ
谷物种子的生活史可分为发育和萌发两个阶段，中间有一个静止期。种子发育和萌发需要新组织的生长和分化，但也需要细胞的有序消失，这是通过程序性细胞死亡（PCD）过程发生的。因此，谷类种子已成为研究植物发育PCD的极好模型系统。在种子发育的早期阶段，母体组织如珠心、果皮和珠心突起通过PCD经历进行性退化，这允许其细胞内容物的再动员用于滋养新的子代组织如胚和胚乳。在稍后的阶段，在种子成熟期间，胚乳经历PCD，但这些细胞在成熟的谷粒中保持完整，并且它们的内容物直到萌发才被再活化。因此，当种子发育完成时，唯一存活的组织是胚轴、盾片和糊粉层。在萌发的种子中，盾片和糊粉层在产生水解酶中起重要作用，水解酶用于动员淀粉质胚乳的储存化合物，其用于支持早期幼苗生长。一旦这一功能完成，盾片和糊粉细胞经历PCD;它们的内容物被用来支持发芽胚的生长。PCD的发生与严格控制的时空模式，允许协调不同的种子组织之间的营养通量。在这篇综述中，我们将总结目前的知识组织经历PCD在发展和发芽谷物种子，集中在生化特征的过程。将讨论激素和氧化还原调节对PCD控制的影响。
The life cycle of cereal seeds can be divided into two phases, development and germination, separated by a quiescent period. Seed development and germination require the growth and differentiation of new tissues, but also the ordered disappearance of cells, which takes place by a process of programmed cell death (PCD). For this reason, cereal seeds have become excellent model systems for the study of developmental PCD in plants. At early stages of seed development, maternal tissues such as the nucellus, the pericarp, and the nucellar projections undergo a progressive degeneration by PCD, which allows the remobilization of their cellular contents for nourishing new filial tissues such as the embryo and the endosperm. At a later stage, during seed maturation, the endosperm undergoes PCD, but these cells remain intact in the mature grain and their contents will not be remobilized until germination. Thus, the only tissues that remain alive when seed development is completed are the embryo axis, the scutellum and the aleurone layer. In germinating seeds, both the scutellum and the aleurone layer play essential roles in producing the hydrolytic enzymes for the mobilization of the storage compounds of the starchy endosperm, which serve to support early seedling growth. Once this function is completed, scutellum and aleurone cells undergo PCD; their contents being used to support the growth of the germinated embryo. PCD occurs with tightly controlled spatial-temporal patterns allowing coordinated fluxes of nutrients between the different seed tissues. In this review, we will summarize the current knowledge of the tissues undergoing PCD in developing and germinating cereal seeds, focussing on the biochemical features of the process. The effect of hormones and redox regulation on PCD control will be discussed.
登录
查看更多内容
影响因子：
7.4
作者：
Beligni, MV;Fath, A;Jones, RL
通讯作者：
Jones, RL
影响因子：
7.4
作者：
Aoki, Naohiro;Scofield, Graham N.;Furbank, Robert T.
通讯作者：
Furbank, Robert T.
影响因子：
7.4
作者：
BROWN, PH;HO, THD
通讯作者：
HO, THD
影响因子：
7.4
作者：
Dominguez, F;Cejudo, FJ
通讯作者：
Cejudo, FJ
影响因子：
4.3
作者：
Domínguez, F;González, MC;Cejudo, FJ
通讯作者：
Cejudo, FJ