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The period before and after autumn begins was suitable season for bud grafting.

结论]美国杏李高接换种的最佳时期是早春3月上旬,带木质部芽接法平均产量较高,劈接、插皮接次之。

The sowing depth of spring sowing (through the stratification of damp sand) was optimum at 5~6cm, and the seedling emergence rate was up to 98.5%. Chop, chip, abdomen grafting and bud grafting with xylem went well in early and middle March and the suitable slacking time was from late July to early August.

春播播种深度以5~6cm为佳,出苗率达98.5%;劈接、切接、腹接、带木质部芽接宜在3月上中旬进行,适宜的解绑时间是7月下旬~8月上旬。

The activity of the vascular CAMBIUM gives rise to the secondary xylem and secondary phloem.

维管形成层的活动使次生木质部和次生韧皮部增厚。

Shows that of all types casparian strip exits in endodermis and evident pith does in young root; primary xylem is exarch and tetrarch

结果表明:内皮层都具有凯氏带,幼根均具有明显的髓,初生木质部均为外始式四原型;

Any of various vascular plants,including seed plants and fern s,having a conducting system of xylem and phloem.

导管植物任何种类的维管植物,包括种子植物和蕨类植物,具有木质部和韧皮部导管系统

Ochikarawere studied in morphology. The results indicates that the Oochikara has lateral root primordium and lateral root, and RM109 has no those. The number of pericycle cells in protoxylem of RM109 reduces to the 77% of that of Oochikara ; the number of vessel in metaxylem increases, and the number of vessel Ⅰ is the 149% of that of Oochikara ; the number of vessel Ⅱ is the 321% of that of Oochikara ; and the vessels arrange disorderly.

ochikara的冠根组织形态进行比较,结果表明,大力品种可观察到侧根原基及侧根,而RM1 0 9均无;RM1 0 9的原生木质部间中柱鞘细胞数目减少,为大力的 77%;后生木质部导管数增加,其导管I的数量为大力的 1 4 9%,其导管Ⅱ的数量为大力的 3 2 1 %,且导管排列散乱。

Gibberellins can induce PARTHENOCARPY, and are used in the production of seedless fruits.

一般植物的根茎都可产生赤霉素并输送到木质部和韧皮部。

This indicated that arrowleaf saltbush was able to change the ultrafiltration characteristics of its root system and reduce radial reflection coefficient of the root, thus lowering the risk of higher xylem tension leading to xylem cavitation and able to reduce salt absorption to avoid damage of salt over-accumulation to the plant.

说明三角叶滨藜在盐胁迫下一方面通过改变根系的超滤特性,降低根系径向反射系数来防止木质部拉力过大导致的木质部空化的危险,另一方面通过减少对盐分的吸收来避免盐分过多积累对植株的伤害。

Deep research and comparison show that, besides the centrarch xylem, H. reflexa has G-type tracheids. Upon and between the annular secondary thickenings, the lignified layer of secondary cell wall bears irregular simple perforations of small diameter and high density. So these perforations have the characters of S-type tracheids. The robust xylem strand and dense perforations indicate the strengthened water-conducting capacity.

深入的研究和比较表明H.reflexa的木质部除为心始式外,管胞为G-型,次生壁的木质化层具有不规则的简单穿孔,穿孔直径小,密度大,分布在环纹次生加厚带和其间,兼有S-型管胞穿孔的特征;粗壮的木质部束和密集的穿孔表明较强的输导能力。

Result:Characteristics of the tangentical longitudinal section of stem with resin and surface view of leaves were elucidated.Besides xylem vessels and fibers of the stem,it was found that the red resin also exists in the cortex parenchyma cells of the stem and the medulla and xylem of the root.According to the HPLC fingerprint analysis result of the stems with and without resin,a number of flavones and stilbenoids were detected in the stem in which resin appeared after it wounded.

结果:阐明了含树脂茎的纵切结构以及叶的表面观特征;除了茎木质部导管和纤维中有树脂外,发现剑叶龙血树受到损伤之后在茎皮层薄壁细胞、根的髓部和木质部亦有树脂的分布;含树脂茎和无树脂茎的指纹图谱显示剑叶龙血树茎在形成树脂后的化学成分中出现了较多的黄酮类、茋类成分。

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