下面是該研究團隊於2007年發表的論文摘要,關於過氧化氫與植物的耐寒機制:
Repetition of hydrogen peroxide treatment induces a chilling tolerance comparable to cold acclimation in mung bean. Hung ShuHsien;Wang ChunChi;Ivanov, S V;Alexieva, V;Yu ChihWen Journal of the American Society for Horticultural Science, (2007) Vol.132(No.6) |
Abstract Mung bean seedlings (Vigna radiata L.) of the cultivar Tainan No. 5 (a chilling-sensitive cultivar) pretreated with multiple sprays of 200 mM H₂O₂ showed a tolerance to chilling at 4 degrees C for 36 h, measured by electrolyte leakage, that was greater than that induced by a single treatment and similar to that induced by cold-acclimation at 10 degrees C for 48 h. Two H₂O₂ treatments at an interval of 3 h gave the optimum chilling tolerance. Tolerance induced by H₂O₂ could be distinguished from that induced by acclimation at 10 degrees C according to length at 4 degrees C and corresponding electrolyte leakage. Chilling tolerance induced by H₂O₂ depended on accumulation of glutathione (GSH), which could be significantly reversed by pretreatment with buthionine sulfoximine (BSO). In contrast, tolerance induced by incubation at 10 degrees C for 48 h in light was neither accompanied by accumulation of GSH nor reversed by BSO, suggesting that there are at least two independent mechanisms of developing chilling tolerance. Chilling tolerance of both cold-acclimated and H₂O₂-treated seedlings was decreased by ethyleneglycol-bis(aminoethylether)-N,N'-tetraacetic acid (EGTA) but not by ruthenium red, indicating that the influx of Ca²+ from extracellular, but not intracellular, pools is an important signal in the induction of tolerance. In confirmation, sprays of Ca²+ could be substituted for H₂O₂. |
這個研究使用了200 mM 的過氧化氫(雙氧水)多次噴灑綠豆芽,然後發現它在特定環境下啓動了抗寒機制(註:以電解質流失情形來判斷,筆者推測可能跟正常生理機能維持有關)1-2天左右。先不去討論抗寒機制背後的問題,他的結論是來自細胞外的鈣離子是重要的逆境訊號,因此噴灑鈣離子可以取代過氧化氫,達到啓動抗寒機制的功能。
各位看到這裡一定傻眼了,幫豬籠草噴灑鈣離子可以對抗逆境?這件事情大家想都沒想過,更不用說種植毛氈苔的朋友,一定想要翻桌:這種爛方法要怎麼用在毛氈苔上?(假設抗逆境機制包含高溫與低溫,雖然並沒有直接證據證明兩者的機制雷同。)
首先要跟各位說:別太相信新聞的報導。再來針對應用的部份,筆者認為沒有那麼大的吸引力。雙氧水可能會對植物造成傷害,影響生長發育;而鈣離子的使用濃度並不確定,只知道讓細胞接觸鈣離子可以讓其忍受低溫。對其他不討厭鈣離子的植物,筆者認為這個方法用來暫時抵禦寒流可能有用;而對豬籠草來說,那就看各位有沒有那個膽子去做實驗了。
原則上筆者認為對一些怕寒冷的豬籠草來說,在新芽處塗抹一些鈣離子含量較高的溶液是較合理的施用方式,相信對於植株不會有任何的損害。但由於筆者完全以室內簡易溫室栽培,目前並無打算進行測試。至於雙氧水,筆者相信這就是新聞報導中計畫主持人提到的”比較昂貴又會使植物生長停滯“的舊抗寒液配方,因此不鼓勵各位施用。如果有心對這個議題深入研究的朋友可以自行閱讀相關文獻。
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