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根据一些观察,发现棉子和幼苗在发生形态上有若干未被人引起注意的特征特性,主要是:棉属四个栽培种的胚在种壳中都有一定位置,即呈W形卷曲子叶的上口正对着种壳上的种脊;棉子发芽膨胀时,绝大多数种壳的裂缝发生在种脊近旁;棉子入土状态不同,其发芽、出苗状况有别。种子珠孔端向下者,发芽出土较快而子叶带壳的现象较多,种子珠孔端向上者,发芽较慢而子叶带壳的情况较少;出土不久的幼苗,子叶以幼茎为轴心随着生长而缓慢旋转,多数为顺时针转向;同一棉苗的两片子叶一大一小,大子叶发生形态上在先,而小子叶在后;棉苗第一片真叶出现后,就可推断该株棉花的叶序转向,即第一片真叶、小子叶与大子叶在一个平面上三者连线构成的弧形旋向,即为叶序转向;根据叶序转向,可以推知该棉株任何一个果枝每一节位花朵的花瓣旋向。对以上一些发生形态特征的进一步研究,将会对棉花育种和栽培的实践以及有关理论研究产生有益的作用。
According to some observations, it has been found that cotton seedlings and seedlings have some unidentified features in morphology, mainly because embryos of four cultivars of Gossypium have a certain position in the seed shell, that is, W-shaped curled cotyledons Of the mouth is the seed coat on the seed shell; cotton seed germination expansion, the vast majority of shell cracks occur near the seed spine; cotton seedling into different states, its germination, emergence of different conditions. Seed beads down the end of the sprouting unearthed faster cotyledons shell phenomenon, the seed beads up the end of the sprouting is slower and cotyledons shell less; unearthed young seedlings, cotyledons with young stems of Axis with the growth of slow rotation, the majority of clockwise turn; the same cotton seedlings of two cotyledons a big one small, big cotyledons morphologically preceded, while the small cotyledons behind; , We can infer that the strain of cotton leaves turn, that is the first true leaves, small cotyledons and large cotyledons in a plane formed by the connection of three arc rotation, that is leaf order turn; according to the leaf order turn, It can be inferred that the petals of each flower in each node of the cotton plant turn. Further research on some of the above morphological features will have a beneficial effect on cotton breeding and cultivation practices and related theoretical studies.