Different tolerance mechanism to alkaline stresses between Populus bolleana and its desert relative Populus euphratica
Different tolerance mechanism to alkaline stresses between Populus bolleana and its desert relative Populus euphratica
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博林杨及其荒漠近缘胡杨对碱胁迫的不同耐受机制
DOI：
10.1007/s11104-018-3632-7
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发表时间：
2018-04
期刊：
影响因子：
4.9
通讯作者：
Yao Yinan
中科院分区：
文献类型：
--
作者：
Sun Yufang;Ou Yongbin;Gao Yongfeng;Zhang Xuan;He Yongmei;Li Yuan;Yao Yinan
背景和目的Populus bolleana Lauche。(P. bolleana）和胡杨（Populus euphratica Oliv.）(P.胡杨）分别在轻度和中度碱性土壤条件下存活。本研究旨在探讨两种白杨耐碱性差异的内在机制。方法以2种白杨幼树为材料，在中度碱性土壤中生长，分别从离子浓度、分配与分布、离子转运与氮同化相关基因、氮代谢相关基因、有机酸、叶色素和氧化还原反应等方面分析2种杨树幼叶和老叶的差异。结果碱胁迫下新疆杨体内过量的Na+主要分配到老叶中。过量的Na+被分配到胡杨的幼叶和老叶中，并被Mg 2+、Ca 2+和SO 4（2-）水平的提高所平衡，而氧化参数没有变化。碱胁迫下，两种植物的硝态氮含量都有所降低，胡杨对碱胁迫的适应性强于新疆杨。结论新疆杨和胡杨的耐碱性机制不同。新疆杨通过大量积累Na+保护幼叶，将伤害作用局限于老叶;胡杨则能有效地将过量的Na+区隔化，保持离子平衡，调节幼叶和老叶的氮素运输和代谢，避免碱害。
Background and aims Populus bolleana Lauche. (P. bolleana) and Populus euphratica Oliv. (P. euphratica) separately survive in mild and moderate alkaline soil conditions. The aim of this study was to explore the underlying mechanism for the different alkaline tolerance in the two poplar species. Methods Young saplings of two poplar species were grown in moderate alkaline soil, and the young and old leaves of the two poplars were separately analyzed by ion concentration, allocation and distribution, transcript variation of different genes involved in ion transport and nitrogen assimilation, nitrogen metabolism, organic acid, leaf pigments, and redox responses. Results Excess Na+ under alkali stress was mainly allocated to old leaves in P. bolleana. However, excess Na+ was allocated to both young and old leaves in P. euphratica, and was balanced by enhanced levels of Mg2+, Ca2+, and SO4 (2-), with no change in oxidative parameter. The reduction of nitrate nitrogen occurred under alkali stress in both species; P. euphratica acclimated to alkali stress by more flexible regulation of N metabolism and nitrate absorption than P. bolleana. Conclusions Our results strongly indicated different alkali tolerance mechanisms in P. bolleana and P. euphratica. P. bolleana protects young tissues via profound accumulation of Na+ and confining damage effects into the old leaves under alkali stress, while P. euphratica can effectively compartmentalize excess Na+, keep its ion balance, and adjust nitrogen transport and metabolism in both young and old leaves to avoid alkali damage.
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影响因子：
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作者：
Otrokocsi L;Gölöncsér F;Sperlágh B;Kittel Á
通讯作者：
Kittel Á
影响因子：
1.4
作者：
L. Vorob’eva;E. Pankova
通讯作者：
L. Vorob’eva;E. Pankova
影响因子：
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作者：
Assaad HI;Zhou L;Carroll RJ;Wu G
通讯作者：
Wu G
影响因子：
5.9
作者：
Hajlaoui, Hichem;El Ayeb, Naceur;Denden, Mounir
通讯作者：
Denden, Mounir
影响因子：
8.8
作者：
Chen, Fa-Xing;Liu, Xing-Hui;Chen, Li-Song
通讯作者：
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