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首页> 外文期刊>African Journal of Agricultural Research >Programmed cell death in wheat starchy endosperm during kernel development
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Programmed cell death in wheat starchy endosperm during kernel development

机译：小麦淀粉胚乳发育过程中的程序性细胞死亡

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摘要

Wheat starchy endosperm is fated to die prior to seed maturation. To reveal the death process of wheat starchy endosperm, morphological variations of the nucleus, the breakage of nuclear DNA, the activities of enzymes related to starch synthesis and antioxidization, and grain weight were investigated. Results showed that wheat starchy endosperm death consisted of two main steps: Nucleus degeneration and subsequent denucleated cell development. Nucleus degeneration showed deformation, chromatin condensation, nuclear envelope disruption, and nuclear residue formation from the degenerative nucleus, which were typical features of programmed cell death (PCD), along with starchy endosperm development. Evans blue staining indicated that starchy endosperm cell death occurred asynchronously among the starchy endosperm cells with initiation points randomly distributed in the endosperm tissue. Enzymes related to starch synthesis and anti-oxidization showed high activities and grain weight increased during nucleus degeneration and denucleated cell development stages. These results suggested that the death of wheat starchy endosperm is a special form of PCD.
机译：小麦淀粉状胚乳在种子成熟前注定会死亡。为了揭示小麦淀粉胚乳的死亡过程，研究了细胞核的形态变化，核DNA的断裂，与淀粉合成和抗氧化有关的酶的活性以及籽粒的重量。结果表明，小麦淀粉质胚乳的死亡包括两个主要步骤：核变性和随后的去核细胞发育。核变性显示出变性核的变形，染色质凝结，核被膜破坏和核残留形成，这是程序性细胞死亡（PCD）的典型特征，以及淀粉质胚乳的发育。伊文思蓝染色表明淀粉质胚乳细胞死亡在淀粉质胚乳细胞之间异步发生，起始点随机分布在胚乳组织中。在核变性和去核细胞发育阶段，与淀粉合成和抗氧化有关的酶表现出高活性，且籽粒重量增加。这些结果表明，小麦淀粉质胚乳的死亡是PCD的一种特殊形式。

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