| 紫花苜蓿茎秆组织中木质素的分布与沉积模式 |
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| 引用本文： | 张金青,陈奋奇,汪芳珍,方强恩,师尚礼.紫花苜蓿茎秆组织中木质素的分布与沉积模式[J].草业科学,2018,35(2):363-370. |
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| 作者姓名： | 张金青 陈奋奇 汪芳珍 方强恩 师尚礼 |
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| 作者单位： | 草业生态系统教育部重点实验室,甘肃农业大学草业学院,甘肃省草业工程实验室,中—美草地畜牧业可持续发展研究中心,甘肃兰州730070;草业生态系统教育部重点实验室,甘肃农业大学草业学院,甘肃省草业工程实验室,中—美草地畜牧业可持续发展研究中心,甘肃兰州730070;草业生态系统教育部重点实验室,甘肃农业大学草业学院,甘肃省草业工程实验室,中—美草地畜牧业可持续发展研究中心,甘肃兰州730070;草业生态系统教育部重点实验室,甘肃农业大学草业学院,甘肃省草业工程实验室,中—美草地畜牧业可持续发展研究中心,甘肃兰州730070;草业生态系统教育部重点实验室,甘肃农业大学草业学院,甘肃省草业工程实验室,中—美草地畜牧业可持续发展研究中心,甘肃兰州730070 |
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| 基金项目： | 甘肃省大学生创新创业训练计划项目，甘肃农业大学盛彤笙科技创新基金，国家自然科学基金 |
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| 摘 要： | 以甘农5号紫花苜蓿(Medicago sativa‘Gannong No.5’)为材料,采用组织化学染色方法研究了茎秆中木质素的发生、分布与沉积规律。结果表明,苜蓿茎秆中木质素的分布与生长部位密切相关,在茎秆顶端初生维管组织中仅木质部有木质素分布,随节间下移,木质素开始在初生韧皮纤维、次生木质部和髓射线中大量沉积;茎秆中存在G、S两种木质素,S木质素的发生迟于G木质素;在维管束之间,两种木质素均以"厚角组织处维管束→厚角组织间维管束"的模式沉积,但在维管束内,木质素沉积表现出异质性,G木质素沉积模式为"初生木质部导管→初生韧皮纤维→次生木质部和髓射线";S木质素沉积模式为"初生韧皮纤维→次生木质部和髓射线→髓薄壁细胞"。分析认为,紫花苜蓿茎秆中木质素特殊的沉积模式可能是其对北温带生长环境的一种适应对策。
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| 关 键 词： | G木质素 S木质素 韧皮纤维 木质部 髓射线 异质性 苜蓿 |
The distribution and deposition pattern of lignin in alfalfa stem tissue |
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| Zhang Jin-qing,Chen Fen-qi,Wang Fang-zhen,Fang Qiang-en,Shi Shang-li.The distribution and deposition pattern of lignin in alfalfa stem tissue[J].Pratacultural Science,2018,35(2):363-370. |
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| Authors: | Zhang Jin-qing Chen Fen-qi Wang Fang-zhen Fang Qiang-en Shi Shang-li |
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| Abstract: | This study tested the occurrence,distribution,and deposition of lignin in stem tissue of the alfalfa variety ‘Gannong No.5’ using the histochemical staining method.The research results showed that the distribution of lignin in the stem of alfalfa is closely related to the vascular tissue in different development stages.At the apex of the stem tissue,lignin is only found in the primary xylem.Then,lignin begins to deposit in the primary phloem fibers,secondary xylem,and pith rays,with the internode moving down.Both guaiacyl (G) lignin and syringyl(S) lignin are present in alfalfa stems,and S lignin occurs later than G lignin.Between the vascular bundles,the deposition pattern of the two kinds of lignin is "vascular bundle near the collenchyma→vascular bundles between the collenchyma".However,the deposition of lignin shows the heterogeneity within the vascular bundle.The deposition pattern of G lignin is "primary xylem vessels→primary phloem fibers→secondary xylem and pith rays",while the deposition pattern of S lignin is "primary phloem fibers→secondary xylem and pith rays→pith parenchyma".It is suggested that the special deposition pattern of lignin in the stem of alfalfa is a strategy that is probably appropriate to the growing environment in the north temperate zone. |
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