NPR1-dependent salicylic acid signaling is not involved in elevated CO2-induced heat stress tolerance in Arabidopsis thaliana
NPR1-dependent salicylic acid signaling is not involved in elevated CO2-induced heat stress tolerance in Arabidopsis thaliana
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DOI：
10.1080/15592324.2015.1011944
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发表时间：
2015-06-03
影响因子：
2.9
通讯作者：
Shi, Kai
中科院分区：
文献类型：
--
作者：
Ahammed, Golam Jalal;Li, Xin;Shi, Kai
高二氧化碳可以保护植物免受热胁迫(HS)；然而，其潜在的机制在很大程度上还不清楚。在此，我们利用一组拟南芥突变体，如水杨酸(SA)信号转导突变体(npr1-1和npr1-5)和热休克蛋白(Hsps)突变体(hsp21和hsp70-1)来了解SA信号和HSPs在CO2诱导的HS耐受性提高中的要求。在环境CO_2(380 mU·mol~(-1))条件下，HS(42℃，24小时)显著降低了所有研究植物组的PSII最大光化学效率(Fv/Fm)。除HSP70-1外，富含CO2(800 mU·mol~(-1))的HS显著提高了所有植物组的Fv/Fm值，表明NPR1依赖的SA信号不参与CO2诱导的HS耐受性的提高。这些结果还表明，HSP70-1，而不是HSP21，在高二氧化碳诱导的HS缓解中是必不可少的。
Elevated CO2 can protect plants from heat stress (HS); however, the underlying mechanisms are largely unknown. Here, we used a set of Arabidopsis mutants such as salicylic acid (SA) signaling mutants nonexpressor of pathogenesis-related gene 1 (npr1-1 and npr1-5) and heat-shock proteins (HSPs) mutants (hsp21 and hsp70-1) to understand the requirement of SA signaling and HSPs in elevated CO2-induced HS tolerance. Under ambient CO2 (380 mu mol mol(-1)) conditions, HS (42 degrees C, 24h) drastically decreased maximum photochemical efficiency of PSII (Fv/Fm) in all studied plant groups. Enrichment of CO2 (800 mu mol mol(-1)) with HS remarkably increased the Fv/Fm value in all plant groups except hsp70-1, indicating that NPR1-dependent SA signaling is not involved in the elevated CO2-induced HS tolerance. These results also suggest an essentiality of HSP70-1, but not HSP21 in elevated CO2-induced HS mitigation.