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Involvement of soluble proteins in growth and metabolic adjustments of drought‐stressed Calligonum mongolicum seedlings under nitrogen addition
Plant Biology ( IF 4.2 ) Pub Date : 2020-10-04 , DOI: 10.1111/plb.13190 Zhang Zhihao 1, 2, 3, 4 , Akash Tariq 1, 2, 3 , Fanjiang Zeng 1, 2, 3 , Chai Xutian 1, 2, 3, 4 , Corina Graciano 5
中文翻译：
氮素胁迫下可溶性蛋白参与干旱胁迫下蒙古沙枣幼苗的生长和代谢调节
更新日期：2020-10-04
Plant Biology ( IF 4.2 ) Pub Date : 2020-10-04 , DOI: 10.1111/plb.13190 Zhang Zhihao 1, 2, 3, 4 , Akash Tariq 1, 2, 3 , Fanjiang Zeng 1, 2, 3 , Chai Xutian 1, 2, 3, 4 , Corina Graciano 5
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- The planting of seedlings is the most effective measure for vegetation restoration. However, this practice is challenging in desert ecosystems where water and nutrients are scarce. Calligonum mongolicum is a sand‐fixing pioneer shrub species, and its adaptive strategy for nitrogen (N) deposition and drought is poorly understood.
- Thus, in a pot experiment, we studied the impacts of four N levels (0, 3, 6, 9 gN·m−2·year−1) under drought or a well‐watered regime on multiple eco‐physiological responses of 1‐year‐old C. mongolicum seedlings.
- Compared to well‐watered conditions, drought considerably influenced seedling growth by impairing photosynthesis, osmolyte accumulation and activity of superoxide dismutase and enzymes related to N metabolism. Nitrogen addition improved the productivity of drought‐stressed seedlings, as revealed by increased water use efficiency, enhanced superoxide dismutase and nitrite reductase activity and elevated N and phosphorus (P) levels in seedlings. Nevertheless, the addition of moderate to high levels of N (6–9 gN·m−2·year−1) impaired net photosynthesis, osmolyte accumulation and nitrate reductase activity. N addition and water regimes did not markedly change the N:P ratios of aboveground parts; while more biomass and nutrients were allocated to fine roots to assimilate the insufficient resources. Soluble protein in assimilating shoots might play a vital role in adaptation to the desert environment.
- The response of C. mongolicum seedlings to N addtion and drought involved an interdependency between soluble protein and morphological, physiological and biochemical processes. These findings provide an important reference for vegetation restoration in arid lands under global change.
中文翻译：
氮素胁迫下可溶性蛋白参与干旱胁迫下蒙古沙枣幼苗的生长和代谢调节
- 种苗是恢复植被最有效的措施。但是，在缺乏水和养分的沙漠生态系统中，这种做法具有挑战性。蒙古沙枣（Calligonum mongolicum）是固沙先锋灌木物种，其对氮（N）沉积和干旱的适应策略知之甚少。
- 因此，在盆栽实验中，我们研究了干旱或灌溉条件良好的四个氮水平（0、3、6、9 gN·m -2 ·年-1）对多种生理生理反应的影响（1-岁的蒙古沙枣幼苗。
- 与水分充足的条件相比，干旱通过损害光合作用，渗透液的积累以及超氧化物歧化酶和与氮代谢相关的酶的活性，大大影响了幼苗的生长。增加水分利用效率，增强过氧化物歧化酶和亚硝酸还原酶活性以及提高幼苗中的氮和磷（P）水平表明，氮的添加提高了干旱胁迫幼苗的生产力。尽管如此，中高水平的N（6–9 gN·m -2 ·年-1）损害净光合作用，渗透液积累和硝酸还原酶活性。氮的添加和水的施用方式并没有明显改变地上部分的氮：磷比。同时将更多的生物量和养分分配给细根，以吸收不足的资源。吸收芽中的可溶性蛋白可能在适应沙漠环境中起着至关重要的作用。
- 蒙古樟子松幼苗对氮添加和干旱的响应涉及可溶性蛋白与形态，生理和生化过程之间的相互依赖性。这些发现为全球变化下干旱地区的植被恢复提供了重要参考。
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