铁皮%E6%BE%B3%E9%97%A8%E5%A4%AA%E9%98%B3%E9%9B%86%E5%9B%A2%E8%91%A3%E4%BA%8B%E9%95%BF鲜条为什么会有“紫斑”?
很多还不了解铁皮%E6%BE%B3%E9%97%A8%E5%A4%AA%E9%98%B3%E9%9B%86%E5%9B%A2%E8%91%A3%E4%BA%8B%E9%95%BF的朋友在看到鲜条之后,觉得它上面有一些紫色的斑点,就会质疑:这是不是紫皮%E6%BE%B3%E9%97%A8%E5%A4%AA%E9%98%B3%E9%9B%86%E5%9B%A2%E8%91%A3%E4%BA%8B%E9%95%BF?那么,铁皮%E6%BE%B3%E9%97%A8%E5%A4%AA%E9%98%B3%E9%9B%86%E5%9B%A2%E8%91%A3%E4%BA%8B%E9%95%BF鲜条为什么会有“紫斑”?
每年3月份以后,尤其在温度降到15度以下,突然回升,光照强烈时,在本来成长旺盛的铁皮%E6%BE%B3%E9%97%A8%E5%A4%AA%E9%98%B3%E9%9B%86%E5%9B%A2%E8%91%A3%E4%BA%8B%E9%95%BF阳光照射就会呈现较多的紫色斑驳,呈现斑驳的部位主要会集在茎的叶鞘部位、叶片的叶脉及叶缘邻近,在叶鞘不完全包被的茎部则呈现紫黑色的环,构成显着的黑节。
紫斑的构成是因为%E6%BE%B3%E9%97%A8%E5%A4%AA%E9%98%B3%E9%9B%86%E5%9B%A2%E8%91%A3%E4%BA%8B%E9%95%BF从迅速成长期转到养分堆集期即所谓“长高期”转到“长胖期”后,其分解代谢变慢,而组成代谢持续维持在较高水平,有效成分堆集迅速添加,植株对光照的反响变得特别灵敏所呈现的一种紫外应急反响。
此刻,在光照较强的部位,如野外%E6%BE%B3%E9%97%A8%E5%A4%AA%E9%98%B3%E9%9B%86%E5%9B%A2%E8%91%A3%E4%BA%8B%E9%95%BF或没有遮阳的部位,因为紫外光推进植物组成紫色色素“花色素苷”,并堆集在植物的特定部位,就呈现了上述的紫斑和黑节特性。
在铁皮%E6%BE%B3%E9%97%A8%E5%A4%AA%E9%98%B3%E9%9B%86%E5%9B%A2%E8%91%A3%E4%BA%8B%E9%95%BF组培苗培养的前期,因为还没有进入“长高期”,成长基本在“长胖期”,即堆集养分阶段,也通常呈现显着的紫斑,这在铁皮%E6%BE%B3%E9%97%A8%E5%A4%AA%E9%98%B3%E9%9B%86%E5%9B%A2%E8%91%A3%E4%BA%8B%E9%95%BF培养中是适应环境并已成活的主要象征。
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