The role of photoprotection in defence of two wheat genotypes against Zymoseptoria tritici
The role of photoprotection in defence of two wheat genotypes against Zymoseptoria tritici
复制标题
DOI：
10.1111/ppa.13392
复制
发表时间：
2021-05-14
期刊：
影响因子：
2.7
通讯作者：
Ray, Rumiana, V
中科院分区：
文献类型：
--
作者：
Ajigboye, Olubukola O.;Jayaweera, Dasuni P.;Ray, Rumiana, V
这项研究提供了新的见解光保护的作用，在预先形成的和诱导的防御两个小麦基因型与对比表型感染Zymoseptoria triumph。我们研究了感染早期光保护反应的机制，包括非光化学猝灭（NPQ），β-胡萝卜素衍生的叶黄素，活性氧，和植物激素脱落酸（阿坝），茉莉酸（JA），水杨酸（SA）。此外，我们量化的光合作用，气孔控制和植物防御分子标记的表达的发病机制的影响。NPQ的qI组分导致光系统II量子产率和叶绿素a：B的快速下调，增加叶黄素类新黄质和阿坝的生物合成，以及叶绿体特异性酶的表达以参与O-2（？-）的清除。阿坝的抗性基因型与预先形成的叶片防御性状，包括气孔密度低，增加蜡生物合成的表达，和木质化。Z.在抗性寄主基因型上，小偃麦表现出减少的萌发和分枝，并通过增强气孔对光的敏感性来劫持两种基因型的气孔控制。JA和花青素苷的生物合成增加，相反，SA，量化的不相容的相互作用。结果表明，阿坝和JA对SA的拮抗作用与美洲狮对Z.三个月。
This study provides new insights into the role of photoprotection in preformed and induced defence of two wheat genotypes with contrasting phenotypes to infection by Zymoseptoria tritici. We investigated the mechanisms of the photoprotective response during early infection, including nonphotochemical quenching (NPQ), beta-carotene-derived xanthophylls, reactive oxygen species, and the phytohormones abscisic acid (ABA), jasmonic acid (JA), and salicylic acid (SA). Furthermore, we quantified the effects of pathogenesis on photosynthesis, stomatal control, and expression of plant defence molecular markers. The photoprotective mechanism of successful defence involved the qI component of NPQ leading to rapid down-regulation of photosystem II quantum yield and chlorophyll a:b, increased biosynthesis of the xanthophyll neoxanthin and ABA, and the expression of chloroplast-specific enzymes to engage in scavenging of O-2(?-). Elevated ABA in the resistant genotype correlated with preformed leaf defence traits including low stomatal density, increased expression of wax biosynthesis, and lignification. Z. tritici exhibited reduced germination and branching on the resistant host genotype and hijacked stomatal control in both genotypes by enhancing stomatal sensitivity to light. Increased biosynthesis of JA and anthocyanins, in contrast to SA, were quantified in the incompatible interaction. Our results indicate that ABA and JA in antagonistic action to SA were associated with defence in the resistant genotype, Cougar, against Z. tritici.