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首页> 外文期刊>IAWA Journal >The occurrence and development of intraxylary phloem in young Aquilaria sinensis shoots
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The occurrence and development of intraxylary phloem in young Aquilaria sinensis shoots

机译：青春痘肾盂咽部胰岛植物射击的发生与发展

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Agarwoods such as Aquilaria spp. and Gyrinops spp. (Thymelaeaceae) produce intcrxylary phloem in their secondary xylem and intraxylary phloem at the periphery of the pith, facing the primary xylem. We studied young shoots of Aquilaria sinensis and characterized the development of its intraxylary phloem. It was initiated by the division of parenchyma cells localized in the outer parts of the ground meristem immediately following the maturation of first-formed primary xylem. Its nascent sieve plates bore donut-like structures, the individual pores of which were so small (less than 0.1 pm) that they were hardly visible under FE-SEM. Intraxylary phloem developed into mature tissue by means of the division and proliferation of parenchyma cells. During the shoots' active growth period, the sieve pore sizes were 0.1-0.5 mu m, with tubular elements passing through them. In the maturation stage, large clusters of sieve tubes continued to be differentiated in the intraxylary phloem. In the partial senescence stage observed in a three-centimeter-diameter branch, intraxylary phloem cells in the adaxial part became crushed, and sieve plates had pores over 1-2 mu m in diameter without any callose deposition. Before and after the differentiation of interxylary phloem in the first and second internodes, callose staining detected more than twice as many sieve tubes in intraxylary phloem than in external phloem. However, after differentiation of intcrxylary phloem in the eleventh internode, more sieve tubes were found in interxylary phloem than in intraxylary and external phloem. This suggests that prior to the initiation of interxylary phloem intraxylary phloem acts as the principal phloem. After its differentiation, however, interxylary phloem takes over the role of principal phloem. Interxylary phloem thus acts as the predominant phloem in the translocation of photosynthates in Aquilaria sinensis.
机译：Aquilaria spp等agarwoods。和甘氨酸spp。 （Thymelaeaceae）在其次级Xylem和髓内韧皮的髓内韧皮中产生髓质内的韧皮，面向主木质。我们研究了Aquilaria Sinensis的幼苗，并表征了其intharylary phloem的发展。在第一型初级木耳的成熟之后，由立即定位在地面分子的外部部分中的实质细胞分裂。它的新生筛板钻孔甜甜圈状结构，其单个孔非常小（小于0.1μm），它们在Fe-Sem下几乎不可见。通过牙科细胞的分裂和增殖开发骨内韧皮型成熟组织。在芽的主动增长期间，筛孔尺寸为0.1-0.5μm，管状元件通过它们。在成熟阶段，在肝内韧皮内继续分化大型筛子管。在三厘米直径的分支中观察到的部分衰老阶段，在抑制的粉碎部分中的肾内韧皮细胞变碎，并且筛板直径超过1-2μm的孔，而没有任何胼舌沉积。在第一和第二个间节区中的基质韧皮内的异端韧皮肽的分化之前和之后，胼phloem中检测到筛窦内的筛剂中的两倍多于外部韧皮肌。然而，在第11个间质节中的抑制韧皮内的分化之后，在骨内韧皮内发现更多的筛子管比在肾盂内和外部韧皮内。这表明在启动intxylary phloem intharylary phloem作为主要phloem的作用。然而，在差异化之后，脊髓神经韧皮肽接管主要韧皮肌的作用。因此，脊髓型韧皮益柱作为Aquilaria Sinensis光合酯的易位中的主要韧皮肌。

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