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小麦 ( Triticum aestivum)返白系在返白阶段 Chl、胡萝卜素 ( Caro)含量均下降 ,但 Caro/ Chl的比值大于对照 ,表明叶片白化不是因 Caro减少引起的。Chl下降的同时 ,Chla和 Chlb均下降 ,表明该突变体属阶段性缺总 Chl型。返白初期 Chlase活性增高 ,返白中期活性下降 ,表明 Chl降解不是造成叶片失绿的主要原因 ;Chl合成中间物 δ-氨基酮戊酸 ( ALA)、胆色素原 ( PBG)积累 ,尿卟啉 ( Uro )、原卟啉 ( Proto )、镁 -卟啉 ( Mg- Proto )、原叶绿素酸 Pchl减少 ,特别是 Uro 在返白中期含量最低 ,复绿初期却急剧积累 ,表明叶绿素合成受阻于尿卟啉原 ( Urogen )的形成上。
The contents of Chl and Caro in the rejuvenating white matter of wheat (Triticum aestivum) decreased at the returning stage, but the ratio of Caro / Chl was greater than that of the control, indicating that the leaf albination was not caused by the decrease of Caro. At the same time Chl decreased, both Chla and Chlb decreased, indicating that the mutant was a stalled Chl type. The activity of Chlase was increased and the activity of midgut of return to white was decreased at the beginning of returning to white, indicating that Chl degradation was not the main cause of leaf chlorosis. Chl synthesis intermediate ALA, PBG accumulation, uroporphyrin Uro, Proto, Protoporphyrin and Pchl of protoporphyrin decreased. Especially, Uro had the lowest contents in the middle of reversion and rapidly accumulated in the early re-greening period, indicating that chlorophyll synthesis was blocked in urine Porphyrinogen (Urogen) on the formation.