bract 中文意思是什麼

bract 解釋
n. 名詞 【植物；植物學】苞，托葉；苞片。
-let 小苞片。

  1. In the early december, the first bract primordium was formed in the axil scale at the cone base, then bract initiation had occurred in acropetal direction

    12月初，最初的苞片原基在雌球果原基的鱗片的葉腋處產生，之後其由基部向頂部連續發生。
  2. At the end of february, the bract attained approximately their full size, and a pair of anatropous ovules were initiated on the adaxial surface at the base of the fertile ovuliferous scale

    2月底，苞片體積不再發生變化，珠鱗膨大端的基部的近軸面分化出2個倒生胚珠。
  3. Spadix rachis flat, margin with bract - like appendages ; flowers small, monoecious, in 2 series on rachis, apetalous

    肉穗花序軸扁平，邊緣有苞片狀附屬物；花小，單性，雌雄同株，呈2列排列于花序軸上，無花被。
  4. Bract scale the structure found in large numbers in the female cone of gymnosperms, each bearing an ovuliferous scale in its axil

    苞鱗：在裸子植物的雌球果中大量存在的結構，每個苞鱗都包含一個珠鱗。
  5. Anterior bract cell

    前苞片細胞
  6. It has long been believed that plant bract is one kind of metamorphism of or evolved directly from leaf

    一般認為，苞片是葉片的變態或自葉片演化而來。
  7. For example ， the spiral arrangement of scale - bract complexes on ovule - bearing pine cones ， where the female reproductive organs of conifers are located ， is important to the production of airflow patterns that spiral over the cone ' s surfaces ， thereby passing airborne pollen from one scale to the next

    例如，帶有胚珠的松球的鱗苞綜合體的螺旋狀安排，亦即松柏目植物雌性殖器官的所在位置，對于氣流模式的形成與產生殊為重要，而這些氣流模式在松球的表現盤旋上升，從而把在空氣中飛行的花粉從一個鱗苞傳播至下一個鱗苞。
  8. This species is one of perfect materials to examine the developmental mechanism of plant bract, to explore the developmental relationship between leaf and bract, as well as to study the role and essential function of bract on plant reproductive biology and ecology

    該物種是研究植物苞片發育的分子機理及探討苞片與葉片發育的相互關系的理想材料，也是探討苞片在植物生殖生物學及生殖生態學中作用和功能的理想材料。
  9. Morphology all ephedra species from china are illustrated with great details on male and female cones. the photographs provide valuable information of characters including peduncle of cone, bract, and micropylar tube etc. for classification and identification of ephedra species from china

    2 、形態學提供了中國麻黃屬種類的標本（包括模式標本）照片資料及中國麻黃屬植物的雌球花和雄球花的照片資料，為麻黃屬分類和系統學研究提供了證據。
  10. In virtue of the technique of suppression subtractive hybridization, we had successfully constructed a subtractive library of d. involucrata sprouting bract by taking homochronous leaf as driver in this study

    本研究利用新近發展的抑制性差減雜交技術（ ssh ）成功構建了珙桐幼嫩苞片和葉片差減文庫。
  11. In the most extreme condition in uni - ovulate cone, the female reproductive unit ( fru ) occupies the position of the terminal bud. an evolutionary trend of reduction is supported in the genus from tri - ovulate to uni - ovulate cone, in which the bract number and seed number are reduced, and the seed size and seed surface sculpture are increasing

    總之，麻黃屬雌球花有簡化的趨勢，伴隨著這種趨勢，雌球博士學位論文中國麻黃屬植物的分類? ?兼論麻黃屬的演化花苞片數目減少、種子數目減少、種子體積增大、表面復雜度增加。
  12. Differential screening for the library revealed that, 167 of 237 clones randomly selected from the library are positive and represent genes that were exclusively or intensively expressed in bract, which contain inserts ranging from 100 to 2000 bp in length. moreover, except a few clones were expressed predominantly in bract, absolute majority of subtraclive clones were expressed at low level in all checked organs, i. e., bract, leaf and root

    用地高辛標記的珙桐苞片、葉片和根的cdna做探針，與差減雜交所獲得克隆的pcr產物的雜交結果表明，有少數基因在這些器官中都是大量表達，而大多數在這些器官里的表達量均很少，除苞片外，一般均檢測不到，有部分基因在苞片中優勢表達。
  13. Reverse northern hybridization indicated that p1a5 gene was over - expressed in bract compared with that in leaf. this expression pattern was further conformed by rt - pcr. sequence analyses revealed that it is a partial sequence of a lipid transfer protein gene

    通過抑制性差減雜交的到克隆pias ，反向northern雜交表明它在玖桐苞片中優勢表達，即在苞片中的表達水平遠遠超過在處于同時期的葉片中的表達水平。
  14. Gene population encoding proteins that involve in plant defensive reactions and adversity resistance, such as p1a5 gene encoding a non - specific lipid - transfer protein, p1b4 gene encoding a raucaffricine - o - p - d - glucosidase and p2d4, encoding a proline - rich protein ; ( 2 ) gene populations with antagonistic effects occurred simultaneously in sprouting bract, e. g.,

    如pib4基因編碼的葡萄糖昔酶、 pias基因編碼的植物脂肪轉移蛋白、 pzd4基因編碼的一種富含脯氨酸的蛋白都有參與植物的抗逆、防禦或應激反應的功能八2 ）幼嫩苞片中有互為桔抗作用的基因同期表達。
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