Environmental Research and Innovation Department, Luxembourg Institute of Science and Technology, 5, Avenue des Hauts-Fourneaux, 4362, Esch/Alzette, Luxembourg.
Groupe de Recherche en Physiologie Végétale, Université catholique de Louvain, 5, Place Croix du Sud, 1348, Louvain-la-Neuve, Belgium.
Planta. 2018 Oct;248(4):1029-1036. doi: 10.1007/s00425-018-2951-5. Epub 2018 Jul 2.
The application of jasmonic acid results in an increased secondary growth, as well as additional secondary phloem fibres and higher lignin content in the hypocotyl of textile hemp (Cannabis sativa L.). Secondary growth provides most of the wood in lignocellulosic biomass. Textile hemp (Cannabis sativa L.) is cultivated for its phloem fibres, whose secondary cell wall is rich in crystalline cellulose with a limited amount of lignin. Mature hemp stems and older hypocotyls are characterised by large blocks of secondary phloem fibres which originate from the cambium. This study aims at investigating the role of exogenously applied jasmonic acid on the differentiation of secondary phloem fibres. We show indeed that the exogenous application of this plant growth regulator on young hemp plantlets promotes secondary growth, differentiation of secondary phloem fibres, expression of lignin-related genes, and lignification of the hypocotyl. This work paves the way to future investigations focusing on the molecular network underlying phloem fibre development.
茉莉酸的应用导致次生生长增加，以及纺织大麻（Cannabis sativa L.）下胚轴中额外的次生韧皮纤维和更高的木质素含量。次生生长提供了木质纤维素生物质中的大部分木材。纺织大麻（Cannabis sativa L.）因其韧皮纤维而被种植，其次生细胞壁富含结晶纤维素，木质素含量有限。成熟的大麻茎和较老的下胚轴的特征是源自形成层的大块次生韧皮纤维。本研究旨在探讨外源茉莉酸对次生韧皮纤维分化的作用。我们确实表明，外源施用这种植物生长调节剂可促进年轻的大麻苗的次生生长、次生韧皮纤维的分化、木质素相关基因的表达以及下胚轴的木质化。这项工作为未来专注于韧皮纤维发育的分子网络的研究铺平了道路。
