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瓠瓜(Lagenaria Valgaris Ser)又称扁蒲或夜开花,在华东、华中、华南栽培甚为普遍.我国许多大城市蔬菜产区都曾发生过瓠瓜变苦的实现,变苦果实味苦如胆,食之会发生呕吐、下泻和痉挛等中毒症状.有的城市(广州)曾因此而缩减瓠瓜种植面积或停种.南北朝著名博物学家陶宏景写道:“今瓠忽有苦者,如胆不可食.”近来我国各大城市郊区发现的瓠瓜变苦也都是突然出现的.正如三国东吴生物学家陆玑所描述的“瓠瓜原种是甘,忽变为苦.”其原因自古以来多归咎于栽培管理或外界条件影响.我们通过调查及杂交试验确定,瓠瓜变苦与栽培管理及外界条件毫无关系.苦味是由显性基因Bt-即苦味基因决定,而另一对基因即Ⅱ和ii也和苦味形成有关.当隐性基因ii纯结合时,ii对其非等位基因Bt-变苦有抑制作用,只有植株同时存在Bt-和I-时才使果实形成一种
Lagenaria Valgaris Ser (Lagenaria Valgaris Ser), also known as flat or night flowering in East China, Central China, South China is very common cultivation in many large vegetable producing areas in our country have had the melon become bitter, the bitter bitter fruit such as bitter Gall bladder, food will occur vomiting, diarrhea and spasm and other symptoms of poisoning .There are cities (Guangzhou) has thus reduced the cucumber planting area or stop the species .North and Northern Dynasties famous naturalist Tao Hongjing wrote: Such as edible. “Recently, the suburbs of major cities in our country found melon melon bitter also are sudden .As the Three Kingdoms Dong Wu biologist Lu Ji described the” melon seeds are sweet, suddenly changed into bitter. "The reason for this is attributed more to cultivation management or external conditions since ancient times.We confirmed through investigation and crossbreeding that the bitter taste is not related to cultivation management and external conditions.But bitterness is determined by the dominant gene Bt- While the other pair of genes, ie, II and II, are also related to the formation of bitter taste. When the recessive gene ii is purely bound, ii inhibits its non-allelic Bt-mutagenesis only when the plants present both Bt- and I- Make the fruit a kind