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葫芦科植物的种子内有两片肥大的子叶,营养物质都貯藏在子叶里。种子发芽过程中依靠子叶供给养分。此外,子叶还起了保护胚芽顺利穿过土层伸出土面的作用。种子发芽出土之后,子叶转变成绿色,成为真叶开展以前为秧苗进行光合作用的器官。北京农民栽培温室黄瓜的经验,认为使子叶克分长大是育成壮苗和保证丰产的一个重要环节。全国各地农民对于其他各种瓜类蔬菜的栽培经验,也都认为保护子叶对育成壮苗有密切关系。据A.B.勃拉戈维申斯基(1937)的意见,认为子叶有制造调节植物生殖力的
Cucurbitaceae seeds have two hypertrophy cotyledons, nutrients are stored in cotyledons. Cotyledons supply nutrients during seed germination. In addition, the cotyledons also play a role in protecting embryos from reaching the soil surface through the soil layers. After the germination of the seeds, the cotyledons turn into green and become the organs that the true leaves carry out for photosynthesis before the seedlings. The experience of Beijing peasants cultivating cucumbers in greenhouses believes that making sub-leaves grow and grow is an important part of cultivating strong seedlings and ensuring high yields. Peasants throughout the country for a variety of other melons and vegetables cultivation experience, also think that the protection of cotyledons to grow strong seedlings are closely related. According to A.B. Blagoveshchinski (1937), cotyledons are thought to have the ability to regulate plant fertility