Durum wheat with the introgressed TaMATE1B gene shows resistance to terminal drought by ensuring deep root growth in acidic and Al3+-toxic subsoils

文献类型： 外文期刊

第一作者： Liu, Lijun

作者： Liu, Lijun;Bai, Chunming;Chen, Yinglong;Palta, Jairo A.;Siddique, Kadambot H. M.;Chen, Yinglong;Palta, Jairo A.;Siddique, Kadambot H. M.;Palta, Jairo A.;Delhaize, Emmanuel;Delhaize, Emmanuel

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关键词： Subsoil Al3+ toxicity; Triticum turgidum; TaMATE1B gene; Root system; Water stress; Acid soil

期刊名称：PLANT AND SOIL （ 影响因子：3.299； 五年影响因子：3.88 ）

ISSN： 0032-079X

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收录情况： SCI

摘要： Background and aims High aluminum (Al3+) concentrations associated with subsoil acidity is a major constraint to durum wheat (Triticum turgidum) production as it inhibits root growth affecting crop tolerance to drought. This study evaluated the introgressed TaMATE1B gene on drought resistance and Al3+ toxicity in durum wheat. Methods Durum wheat lines Jandaroi-TaMATE1B (introgressed with the TaMATE1B gene) and Jandaroi-null (without TaMATE1B gene) were grown in 1-m deep columns filled with re-constructed field soil with Al3+-rich acid subsoil in a glasshouse under well-watered conditions until the onset of ear emergence (Z(51)), before imposing well-watered and terminal drought treatments. Results Jandaroi-TaMATE1B produced 25.3 % higher grain yield than Jandaroi-null under well-watered conditions and 49.0 % higher grain yield under terminal drought. Terminal drought reduced grain yield by 47.7 % in Jandaroi-TaMATE1B and 72 % in Jandaroi-null, relative to well-watered conditions. The effects of TaMATE1B on grain yield can be attributed to increased root growth and proliferation below 0.4 m in Al3+-toxic soil. Jandaroi-TaMATE1B had 34.5 and 32.0 % more total root biomass than Jandaroi-null in the well-watered and terminal drought treatments, respectively (P <= 0.05). Jandaroi-TaMATE1B had a significantly higher root: shoot ratio than Jandaroi-null at Z(51). Introgression of the TaMATE1B gene did not affect grain-filling duration, but terminal drought reduced it by 24 days in both lines. Conclusions Introgression of the Al3+-tolerant TaMATE1B gene into durum wheat improved terminal drought resistance by enabling root growth and proliferation into deep layers of Al3+-rich acidic soil.

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