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Physio-Biochemical and Stomatal Response of Quinoa to Exogenous Paclobutrazol Application under Saline Conditions
Student Name: Muhammad Waqas
Thesis AdvisorChen Yaning 陈亚宁
Degree Grantor中国科学院大学
Place of Conferral新疆乌鲁木齐
Degree DisciplineDoctor of Philosophy in Plant Physiology(理学博士)
Keyword藜麦 盐胁迫 PBZ 抗氧化剂 离子 MDA ROS Chenopodium Quinoa Salt Stress PBZ Antioxidants Ion
Abstract盐是限制全球作物生产率的一个主要因素,而且由于农业用地管理不善,盐害范围和严重程度将进一步加剧。用良好管理技术来种植耐盐作物有降低盐害的可能性,这样也可以提高作物产量和生理机能。本文选择藜麦,一种高度营养的、有潜力为今后的食品安全做出贡献的耐盐作物来研究。研究表明,不同的盐浓度,尤其是 400mMNaCl,会降低藜麦的生长和产量。盐诱导的损伤被归因于光合色素的降解,体交换特性,气孔大小和密度降低,离子毒性和氧化性损伤。尽管如此,在最适宜盐浓度和盐胁迫的两种条件下,20毫克/升的 PBZ(一种新的激素)通过土壤渗透可提高藜麦作物的生长和产量。PBZ 应用降低了盐损害,通过改善叶绿素含量、气体交换特性、叶片近轴和远轴表面的气孔密度、渗透调节物质包括在根和叶组织中的脯氨酸、可溶性糖(TSS)等方式。PBZ 通过减少Na+ 和 Cl-及提高 K+,Mg2+和 Ca2+的方式来控制根和叶组织中的离子稳态。PBZ 也可通过提升酶和非酶的抗氧化活性,来抑制活性氧(ROS)生成,包括 H2O2、O2 和降低脂质过氧化(MDA)水平,来减少根内(确切地说是在叶组织中)的氧化损伤。叶片中的生化变化比根组织中的更明显。多元分析表明在 Na+ 、Cl-、ROS 和 MDA 之间有很强的正相关性, 但这些因子都与作物产量及其贡献有负相关性。结果表明,在最适宜盐浓度和盐胁迫的两种条件下,PBZ通过改善叶绿素含量、净光合作用、渗透调节物质和和抗氧化剂活性、调节防止氧化性损伤的离子内稳态的方式,提高了藜麦产量。然而,在正常和高盐环境下,PBZ 可以被作为一种霰弹枪的方式来提高藜麦和其他作物的性能.
Other AbstractSalinity is a major factor limiting the crop productivity across the globe and its extent andseverity will further be raised due to poor management practices on agricultural lands. Possibilitylies to grow salt-tolerant crops with better management techniques, which can improve crop yieldand physiology. Therefore, a highly nutritive salt-tolerant crop quinoa, having potential tocontribute for future food security selected for this investigation. Results revealed that amongdifferent concentrations of salinity, 400 mM NaCl reduced growth and yield of quinoa. Salinityinduced damages attributed to photosynthetic pigments degradation, reduced gaseous exchangetraits, stomatal aperture and density, ionic toxicity and oxidative damages. Nevertheless, 20 mg L1application of PBZ (a novel hormone) by soil drenching improved growth and yield of quinoaplants under both optimum and salt stressed conditions. PBZ application mitigated the salinityinduced adversities by improving chlorophyll contents, gaseous exchange traits, stomatal densityon adaxial and abaxial surfaces of leaves, osmoprotectants including proline and total solublesugars (TSS) in roots and leaves tissues. PBZ regulated ionic homeostasis steered by decreasedNa+and Cl- with improved K+, Mg2+ and Ca2+ in both root and leaves tissues. PBZ also alleviatedthe oxidative damages by increasing enzymatic and non-enzymatic antioxidants activity,suppressing the reactive oxygen species (ROS) generation including H2O2, O2-and lowered lipidperoxidation (MDA) level in roots and more specifically in leaf tissues. Biochemical changes weremore obvious in leaves than roots tissues. A multivariate analysis highlighted strong positiveassociations between Na+, Cl-, ROS and MDA in roots and leaves, all of these negatively correlatedwith yield and its contributing attributes. It was concluded, PBZ improved quinoa yield under bothoptimum and salt stressed conditions through better chlorophyll contents, net photosynthesis,osmoprotectants and antioxidants activity, mediated ionic homeostasis, which protected fromoxidative damages. However, PBZ can be opted as a shotgun approach to improve the performanceof quinoa and other crops under normal and high saline conditions.
Subject Area生态学
Document Type学位论文
First Author Affilication中国科学院新疆生态与地理研究所
Recommended Citation
GB/T 7714
Student Name: Muhammad Waqas. Physio-Biochemical and Stomatal Response of Quinoa to Exogenous Paclobutrazol Application under Saline Conditions[D]. 新疆乌鲁木齐. 中国科学院大学,2018.
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