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首页> 外文期刊>Protoplasma: An International Journal of Cell Biology >A COMPARATIVE ULTRASTRUCTURAL ANALYSIS OF EXINE PATTERN DEVELOPMENT IN WILD-TYPE ARABIDOPSIS AND A MUTANT DEFECTIVE IN PATTERN FORMATION
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A COMPARATIVE ULTRASTRUCTURAL ANALYSIS OF EXINE PATTERN DEVELOPMENT IN WILD-TYPE ARABIDOPSIS AND A MUTANT DEFECTIVE IN PATTERN FORMATION

机译：野生型拟南芥外源模式发育与模式形成突变缺陷的比较性超微结构分析

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In order to identify factors necessary for the establishment of the reticulate pollen wall pattern, we have characterized a T-DNA tagged mutant of Arabidopsis thaliana that is defective in pattern formation. This study reports the results of an ultrastructural comparison of pollen wall formation in the mutant to wall development in wild-type plants. Pollen wall development in the mutant par allels that of wild-type until the early tetrad stage. At this point in wild-type plants, the microspore plasma membrane assumes a regular pattern of ridges and valleys. Initial sporopollenin deposition occurs on the ridges marking the beginning of probacula formation. In contrast, the plasma membrane in the mutant appears irregular with flattened protuberances and rare invaginations. As a result, the wild-type regular pattern of ridges and valleys is not formed. Sporopollenin is randomly deposited on the plasma membrane and aggregates on the locule wall; it is not anchored to the membrane. Our finding that the mutation blocks the normal invagination of the plasma membrane and disrupts the proper deposition of sporopollenin during wall formation suggests that the mutation could be in a gene responsible for pattern formation. These results also provide direct evidence that the plasma membrane plays a critical role in the establishment of the pollen wall pattern. [References: 32]
机译：为了确定建立网状花粉壁图案所必需的因素，我们对拟南芥的T-DNA标记突变体进行了特征分析，该突变体在图案形成方面存在缺陷。这项研究报告了突变体中花粉壁形成与野生型植物壁发育的超微结构比较结果。突变体的花粉壁发育与野生型相当，直到四生早期。此时，在野生型植物中，小孢子质膜呈规则的山脊和山谷模式。最初的孢粉蛋白沉积发生在标志着小球形成开始的脊上。相反，突变体中的质膜看起来不规则，具有扁平的突起和罕见的内陷。结果，不形成脊和谷的野生型规则图案。孢粉素随机沉积在质膜上并聚集在小室壁上。它没有固定在膜上。我们的发现表明，突变会阻止质膜的正常内陷并破坏壁形成过程中孢粉的适当沉积，这表明该突变可能与负责模式形成的基因有关。这些结果也提供直接证据，表明质膜在花粉壁图案的建立中起关键作用。 [参考：32]

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