1、There were very small effect of seed source and no definite geographic pattern in tracheid length.
管胞長(zhǎng)度的種源區(qū)和產(chǎn)地效應(yīng)很小，無(wú)一定的地理變異趨勢(shì)。

2、Genetic variations on tracheid microfibril Angle of 55 Chinese fir clones were investigated.
對(duì)55個(gè)杉木無(wú)性系管胞微纖絲角的遺傳變異進(jìn)行了研究。

3、The tracheid diameter and the thickness of cell wall increase from pith to bark.
管胞直徑、胞壁厚度自髓心向外增加。

4、Vessel and fibre - tracheid are both spiral thickening distinctly.
導(dǎo)管與纖維管胞均具明顯的螺紋加厚。