氮、锌营养与青花菜花球发育过程中核酸及钙调素的关系

The Effects of Nitrogen and Zinc Nutrition on Nucleic Acid and Calmodulin during the Growth and Development of Curd in Broccoli( Brassica oleracea L.var. italica Planch)

青花菜生长发育过程茎端DNA、RNA、总核酸 (TNA)含量在花序分化前逐渐上升 ,分化时达到高峰 ,分化后一度下降 ,分化 1周时开始回升 ,至花球膨大期达到小高峰 ,花球膨大后期逐渐下降。RNA/DNA比值于花序分化前急剧下降 ,分化后进一步下降 ,现蕾后花球发育膨大期间逐渐回升。茎端钙调素 (CaM)含量在花序分化前逐渐上升 ,分化 1周时达到高峰 ,花球发育和膨大过程中逐渐下降。氮 (N)、锌 (Zn)营养可促进核酸和CaM的代谢 ,但不同N、Zn营养组合使核酸合成活力有所不同 。

The content of DNA,RNA and total nucleic acid(TNA)in stem apex increased gradually before the inflorescence differentiation,and reached a peak at the inflorescence differentiation,then decreased to a proper level at one week after the inflorescence differentiation and increased again to form little peak at the former stage of curd formation,then decreased again at the late stage of curd formation.The RNA/DNA ratio went down rapidly just before the emergence of curd,and went up gradually from the emergence to harvest of curd.The content of Calmodulin(CaM)in stem apex went up gradually before the inflorescence differentiation and reached a peak after one week of the inflorescence differentiation,then went down during curd formation.N Zn nutrition could promote the metabolism of nucleic acid and CaM,but different N Zn nutrition had different effects on the synthetic activity of nucleic acid.Suitable N and Zn nutrition had a marked promoting effect on the synthesis of CaM.