旱害嚴重影響茶樹生長發(fā)育,造成茶葉減產(chǎn)和品質(zhì)下降。揭示茶樹抗旱機理,對培育耐旱茶樹品種,應對干旱脅迫具有重要的理論意義。
課題組以茶樹一葉為研究對象,通過PEG和復水模擬干旱和補水灌溉。干旱抑制茶樹葉肉細胞質(zhì)膜H+-ATPase活性,誘導H+內(nèi)流,介導膜電位去極化,激活K+外排,削弱了葉肉細胞對K+的滯留;復水激活了茶樹葉肉細胞質(zhì)膜H+-ATPase活性,加劇H+外排,超極化膜電位,抑制了K+外排,促進了葉肉細胞對K+的滯留。因此推測葉片質(zhì)膜H+-ATPase可能參與調(diào)控茶樹葉片鉀穩(wěn)態(tài)對干旱和復水響應。
本文第一作者,來自茶葉生物學與資源利用國家重點實驗室的張顯晨博士,一直專注茶樹逆境研究,已經(jīng)利用非損傷微測技術,在茶樹氟富集、干旱脅迫、酸脅迫、鋁脅迫等方向,發(fā)表3篇SCI文章、1篇中文核心文章。
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感謝張顯晨博士供稿。