Sclereids are strong enough to support the delicate corollas: experimental and computational data evidence from Camellia sinensis (L.).
Sclereids are strong enough to support the delicate corollas: experimental and computational data evidence from Camellia sinensis (L.).
复制标题
石片足够坚固，可以支撑精致的花冠：来自茶树 (Camellia sinensis (L.)) 的实验和计算数据证据
DOI：
10.1038/srep43788
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发表时间：
2017-03-02
影响因子：
4.6
通讯作者：
Zhao H
中科院分区：
文献类型：
--
作者：
Zhang W;Xue Y;Yang S;Wang Y;Zhao H
石细胞是广泛存在于高等植物中的一种基本细胞类型，通常被认为具有机械功能。然而，发生石细胞在短暂的花冠很少被记录和他们的生物学意义知之甚少。本研究以不同个体发育阶段的茶树花蕾为材料，通过取样、清洗、切片、染色和光学显微镜观察，研究了茶树花蕾中石细胞的形态、分布及其变异。此外，对具有独特花结构的山茶花进行了调查和比较，以探讨石细胞的发生是否与花的形态有关。特别是，采用有限元分析的计算模拟进行了调查如何花冠，石细胞和无，响应风雨。结果表明，石细胞具有一定的力学性质，这是基于它们的形状和分布，使软花冠足够强大，以保护子房内部。因此，花冠石细胞可能解释了看似精致的花冠如何在环境胁迫下发挥其保护功能。这些发现为以下假设提供了进一步的证据：除了传统上公认的传粉媒介介导的选择之外，花的性状还对非生物因素表现出适应性反应。
Sclereids are a fundamental cell type that widely exist in higher plants and are generally thought to have a mechanical function. However, the occurrence of sclereids in the ephemeral corolla has rarely been documented and their biological significance is poorly understood. In this study, flower buds from Camellia sinensis at various ontogenetic stages were sampled, cleared, sectioned, stained, and examined using light microscopy to ascertain the morphology and distribution of sclereids and their variation. In addition, Camellia japonica plants with distinctive floral structures were investigated and compared to explore whether sclereid occurrence is associated with floral form. In particular, a computational simulation using finite element analysis was undertaken to investigate how corollas, with and without sclereids, responded to wind and rain. The results showed that sclereids have some mechanical properties that are based on their shape and distribution, which make the soft corolla strong enough to protect the inner ovary. Thus, corolla sclereids may explain how the seemingly delicate corolla performs its protective function in response to environmental stresses. These findings provide further evidence for the hypothesis that flower traits exhibit adaptive responses to abiotic factors in addition to their traditionally recognized pollinator-mediated selection.