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| | Initiation of embryogonic colls occurs in embryogenic aggrogates, embryoids and roots of regonerated plants. Respectively, the embryogenic cells from the surface of the embryogeonic aggrogates develop into new embryogenic aggrogates and the inner embryogonic cells evolve a lot of centers of sogme ntationwhich also give rise to new aggrogates. The now aggrogates may either maintain differentiation capacity or lose it, The morphogonesis from embryenic cell to embryoid is mainly similar to that of Maize zygoti... | | 胚性细胞在胚性细胞团、胚状体和再生植株的根部均可以发生。在胚性细胞团表面产生的胚性细胞发育成新的胚性细胞团,在胚性细胞团内部产生的胚性细胞形成许多细胞分裂中心,由这些分裂中心进一步发育成新的胚性细胞团。新的胚性细胞团即可以保持分化能力,也可能丧失分化能力。胚性细胞发育成胚状体的过程与玉米合子胚的形成基本相似。成熟胚状体具有胚芽、胚根、盾片等结构。无性系胚性细胞团具有染色体数目不同的细胞壤嵌存在的特性。由胚性细胞团中的胚性细胞发育成的胚状体,其整倍体细胞占优势,而在丧失正常分化能力的细胞团中,非整倍体细胞占优势。 | | 文摘来源 | | The nucleogenesis and stomatogenesis during conjugation in Paramecium duboscqui were studied by using a protargol technique modified,by the first author.More details than those observed by Jin and Shi in 1983 on the formation of crescent nucleus,exchanging of pronncleus,developing of macro and micro-nuclear anlagen and stomatogenesis have been detected,Before the crescent nucleus came into being the micrenuclei shewed obvious polarity and when the crescent nualeus was forming a clear division center appeare... | | 用作者之一改进的蛋白银技术重新研究了杜氏草履虫接合生殖期间的核器发生和口器发生。在新月核形成,原核交换,大小核胚基的发育和口器发生等方面获得较金玫蕾史新柏(1983)更为详尽的资料。新月核形成之前的小核表现有明显的极性,新月核时期表现有显著的分裂中心。迁移原核的交换要穿过口旁锥区的二个很大的孔洞。老大核分解成两个碎块后不久新的大核胚基内出现核仁性小体,大小核胚基各自都保持4个直到第一次配后虫体分裂。至接合后体的两次细胞分裂时,大核胚基只分配不分裂,4个小核胚基每次都参与分裂,故可认为杜氏草履虫属于四个小核的物种。 | | 文摘来源 | | The dedifferentiation of cells, the formation of callus and the leaf-shaped body, and the differentiation ofregenerated bud from the leaves of strawberry M14 (Fragarid sp. ) cultured on three media were studied. The resultsshowed that hormone can induce the dedifferentiation of epidermal cells, mesophyll cells and parenchy matoure cellsround the vascular bundles. The later two kinds of cells dedifferentiate and form the center of division, finally develop into callus, while leaf-shaped body is formed direct... | | 本文将草莓品系M14的叶片分别在培养基CK(MS+B5)、培养基A(组成为MS+B5+TDZ1.0mg.L-1+IAA1.0mg.L-1)、培养基B(组成为MS+B5+TDZ2.5mg.L-1+IAA0.1mg.L-1)中培养,对细胞的脱分化、愈伤组织的形成、叶状体的产生及再生芽分化进行组织学观察。结果表明,激素可诱导叶表皮细胞、叶肉细胞及维管束周围的其他薄壁细胞脱分化;愈伤组织就是由后两类细胞脱分化形成分裂中心,进一步发育而成的;叶状体可由表皮细胞脱分化后直接分裂形成,不经愈伤组织阶段,但更普遍的是在愈伤组织表层产生;再生芽发生于叶状体上。 | | 文摘来源 | |   | | << 更多相关文摘 |
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