| 赵明苑1，冯 顺2，王春梅1，洪世军1，包冬红2，李卓阳2，顾赵忻2，云 勇1.不同叶龄鹊肾树叶解剖结构及其抗旱性分析[J].广东农业科学,2016,43(8):63-68 |
|
查看全文
HTML
不同叶龄鹊肾树叶解剖结构及其抗旱性分析 |
| Anatomy of different ages of Streblus asper leaves and their drought resistance |
| |
| DOI：10.16768/j.issn.1004-874X.2016.08.011 |
| 中文关键词: 鹊肾树叶片 解剖结构 抗旱性 胁迫 |
| 英文关键词: Streblus asper leaves anatomical structure drought resistance stress |
| 基金项目:海南省农业科学院农业科技创新专项（琼农院[2013]32 号） |
|
| 摘要点击次数: 1698 |
| 全文下载次数: 258 |
| 中文摘要: |
| 以不同叶龄鹊肾树叶为研究对象，采用常规石蜡切片技术、光学显微观察，测定其叶片厚度、表皮角质层厚度、表皮细胞厚度、栅栏组织厚度、海绵组织厚度，并对栅海比（P/S）、叶片组织结构紧密度（CTR）、疏松度（SR）等指标进行统计分析，比较干旱胁迫和复水对不同叶龄鹊肾树叶解剖结构的影响，以探讨其叶片的形态解剖特征对干旱胁迫的适应性响应机制，也为鹊肾树科学引种提供理论依据。结果表明：（1）面对干旱胁迫，鹊肾树各部位叶片形成了与水分环境相适应的一些解剖结构特征。叶栅栏组织细胞出现短缩现象，由1～2 层增至2～3 层；海绵细胞长柱状排列整齐、致密，上下表皮角质层均加厚，上下表皮出现更多的表皮毛以抵抗逆境胁迫。复水后，叶片疏松度增加，表皮毛相应减少。（2）对基部、中部、顶部叶片的10 个解剖性状指标值进行主成分分析表明：可用上表皮角质层厚度、叶片厚度、栅海比这3 个指标来描述干旱胁迫和复水对不同叶龄鹊肾树叶解剖结构的影响。（3）随着干旱胁迫的进行，鹊肾树叶上表皮角质层厚度和叶片厚度增大，复水后恢复正常，中部叶和顶部叶对干旱胁迫的响应灵敏度优于基部叶。 |
| 英文摘要: |
| The leaf thickness，stratum corneum thickness，epidermis thickness，palisade tissue thickness and sponge tissue thickness of streblus asper leaves at different ages were observed by using paraffin section technology and optical microscopic observation to explore the anatomic adaptive response mechanism to drought stress，also provide a theoretical basis for S. asper introduction. The results showed that：Under drought stress，various parts of S. asper leaf anatomy showed some characteristics adapted to water environment. Leaf palisade tissue cells became shorter，increasing from 1-2 layers to 2-3 layers；Sponge cells arranged in neat，compact，upper and down epidermis were thickened. Upper and down epidermis produced more trichomes to resist stress. After rehydration，porosity blade increased and trichomes had a corresponding reduction. The principal component analysis showed that the stratum corneum thickness，leaf thickness and palisade was available to describe the impact of stress and rehydration on different ages of S. asper leaf anatomy. Under drought stress，S. asper leaf stratum corneum thickness and leaf thickness increased and leaves returned to normal after rehydration. Middle and top leaves were better than basal leaves in response to drought stress sensitivity. |
|
查看/发表评论 下载PDF阅读器 |
