Dipartimento Scienze Ambientali, University of Siena, Siena, Italy.
Plant Signal Behav. 2011 May;6(5):732-5. doi: 10.4161/psb.6.5.15125. Epub 2011 May 1.
Callose is the primary polysaccharide present in the so-called secondary layer of the pollen tube cell wall while the content of cellulose in such layer is usually lower. Despite its lower quantity, cellulose might be potentially able to establish the growth direction of pollen tubes. Microtubules have been shown to regulate the deposition of callose synthase in the distal regions of pollen tubes related to the synthesis of callose plugs. However, the interplay between microtubules and cellulose synthase in the pollen tube is unclear. Here, the hypothetical role of microtubules and microtubule-based motor proteins in controlling the insertion of cellulose synthase in relation with growth and directionality of pollen tubes is discussed.
胼胝质是花粉管细胞壁所谓的次生层中主要的多糖，而纤维素在该层中的含量通常较低。尽管纤维素的含量较低，但它可能有潜力确定花粉管的生长方向。微管已被证明可以调节与胼胝质塞合成相关的花粉管远端区域中胼胝质合酶的沉积。然而，微管和纤维素合酶在花粉管中的相互作用尚不清楚。在这里，讨论了微管和基于微管的马达蛋白在控制纤维素合酶插入与花粉管生长和方向性的关系中的假设作用。
