Colonization with arbuscular mycorrhizal fungi improves salinity tolerance of tomato (Solanum lycopersicum L.) plants
Colonization with arbuscular mycorrhizal fungi improves salinity tolerance of tomato (Solanum lycopersicum L.) plants
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DOI：
10.1007/s11104-009-0255-z
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发表时间：
2010-06-01
期刊：
影响因子：
4.9
通讯作者：
Poschenrieder, Charlotte
中科院分区：
文献类型：
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作者：
Hajiboland, Roghieh;Aliasgharzadeh, Naser;Poschenrieder, Charlotte
本研究的目的是探讨菌根化缓解盐胁迫的机制。在无盐土壤(EC = 0.63 dSm(-1))、低盐土壤(EC = 5 dSm(-1))和高盐土壤(EC = 10 dSm(-1))中种植具有不同耐盐性的番茄品种Behta和Piazar。将接种丛枝菌根真菌根内球囊霉 (+AMF) 的植物与未接种的植物 (-AMF) 进行比较。在盐度下，耐盐性更强的 Piazar 中 AMF 介导的生长刺激高于敏感的 Behta。菌根化缓解了盐引起的磷、钙和钾吸收的减少。 +AMF 中的 Ca/Na 和 K/Na 比率也更好。然而，在高盐度下，AMF 的生长改善与植物磷营养无关。菌根化通过提高气孔导度和保护 PSII 的光化学过程免受盐度影响来提高净同化率。 ROS 清除酶的较高活性伴随着 H2O2 的降低、脂质过氧化的减少以及 +AMF 中脯氨酸的升高。不同品种对盐度和菌根化的生长反应的差异可以通过叶子的离子平衡、光化学和气体交换的差异得到很好的解释。抗氧化防御功能似乎是导致盐度下品种不同 AMF 响应性的原因。总之，AMF 可以通过减轻盐诱导的氧化应激来保护植物免受盐胁迫。
The purpose of this study was to investigate the mechanisms underlying alleviation of salt stress by mycorrhization. Solanum lycopersicum L. cultivars Behta and Piazar with different salinity tolerance were cultivated in soil without salt (EC = 0.63 dSm(-1)), with low (EC = 5 dSm(-1)), or high (EC = 10 dSm(-1)) salinity. Plants inoculated with the arbuscular mycorrhizal fungi Glomus intraradices (+AMF) were compared to non-inoculated plants (-AMF). Under salinity, AMF-mediated growth stimulation was higher in more salt tolerant Piazar than in sensitive Behta. Mycorrhization alleviated salt-induced reduction of P, Ca, and K uptake. Ca/Na and K/Na ratios were also better in +AMF. However, growth improvement by AMF was independent from plant P nutrition under high salinity. Mycorrhization improved the net assimilation rates through both elevating stomatal conductance and protecting photochemical processes of PSII against salinity. Higher activity of ROS scavenging enzymes was concomitant with lowering of H2O2, less lipid peroxidation, and higher proline in +AMF. Cultivar differences in growth responses to salinity and mycorrhization could be well explained by differences in ion balance, photochemistry, and gas exchange of leaves. Function of antioxidant defenses seemed responsible for different AMF-responsiveness of cultivars under salinity. In conclusion, AMF may protect plants against salinity by alleviating the salt-induced oxidative stress.