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一.引言植物的性别不仅主要决定于遗传的性状,而且外界条件也极关重要。各种温度条件,营养的特性,日照长度,氢离子的浓度,X射线的作用,外伤等都可改变性别。Edmond(1939)发现在栽培情况下的黄瓜,生长在6月27日到9月6日期间的黄瓜,雄花产生的比例很高。而生长在12月15日到4月15日以及2月17日到5月25日期间的黄瓜则雌花发育占优势。在番木瓜(属雌雄异株植物,亦有雌雄同株及雌雄同花即两性花的类型。)方面,广东农民能人工地使雄株变为雌株。杨明汉将雄株木瓜的主根切断并培上土,经几个月后就结果了。
I. INTRODUCTION Plant sex is not only determined by genetic traits, but also by external conditions. Various temperature conditions, nutritional characteristics, sunshine length, hydrogen ion concentration, X-ray effects, trauma and so on can change the gender. Edmond (1939) found that in the case of cucumbers grown from cucumbers between June 27 and September 6, the percentage of male flowers was high. While the cucumber grown on December 15 to April 15 and February 17 to May 25 had the dominant female flower development. In papaya (a genus of dioecious plants, both monoecious and monoecious, ie bisexual), Guangdong peasants can artificially transform male plants into female plants. Yang Minghan will be the main root of the male plant papaya cut off and cultivated soil, the result after a few months.