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西瓜种子在催芽过程中,有时会出现种皮从发芽孔(种子嘴)处开口,甚至整个种子皮张开的现象。种皮开口后,水分浸入易造成种仁浆种、烂种,胚根不能伸长等。发生这种情况的原因有以下几种: (1)浸种时间过短 西瓜种子的种皮是由四层不同的细胞组织构成的,其外面的两层分别是由比较厚的角质层和本栓层组成的,吸水和透水性较差。如果种子在水里浸泡的时间短,水分便不能渗透到内层去。当外层吸水膨胀后,内层仍未吸水膨胀,这样外层种皮对内层种皮就会产生一种胀力,所以内层种皮便在这一胀力作用下,被迫从发芽孔的“薄弱环节”处裂开口。
Watermelon seeds in the process of germination, and sometimes there will be seed germination hole (seed mouth) at the opening, and even the entire seed bark open phenomenon. After the opening of the seed coat, the water is easy to infiltrate into seed kernels, rotten seeds and the radicle can not elongate. This happens for the following reasons: (1) soaking time is too short Watermelon seeds of the seed coat is composed of four different layers of tissue, the outer two layers are by the thick cuticle and the plug Layer composition, poor water absorption and water permeability. If the seeds are soaked in water for a short time, the water can not penetrate into the inner layer. When the outer layer of water after swelling, the inner layer is still not water swelling, so that the outer seed coat on the inner seed coat will have a swelling force, so the inner seed coat in this expansion under the force, forced from germination Hole “weakness” at the crack opening.