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首页> 外文期刊>Australian Journal of Crop Science >Leaf characterization of Spermacoce verticillata at three stages of development
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Leaf characterization of Spermacoce verticillata at three stages of development

机译：处于发展的三个阶段的黄豆的叶片特征

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Weed control is an essential practice in crop management. However, the use of herbicides may not be effective in certain situations, such as when problems are encountered in the application technology and when tolerant individuals and resistant biotypes are observed. In the cotton producing areas of the state of Bahia, Brazil, Spermacoce verticillata (shrubby false buttonweed) is not effectively controlled during burndown applications. During different developmental stages, plants can modify their leaves’ anatomical structures, which may influence herbicide control by modifying the retention, absorption, translocation and final effect of the chemical. This study assessed the morphological and histological differences in Spermacoce verticillata leaves at different stages of development. Leaves were collected from plants at different phenological stages (2-4 leaves, 4-6 leaves and flowering) and subjected to histological and scanning electron microscopy analyses. In the histological analysis, four leaves were collected from the upper nodes. The evaluated characteristics were the total leaf blade thickness, palisade and spongy parenchymal thicknesses, cuticle and epidermal cell thicknesses on the abaxial and adaxial surfaces and midrib height and width. Surface analyses were performed by observing the leaves under a scanning electron microscope. As the developmental stages of Spermacoce verticillata advanced, the plants began to show reduced leaf thickness due to the decreased abaxial epidermal thickness, transport vessel size and parenchymal thickness. At more advanced stages of development (4-6 leaves and flowering), the adaxial leaf surfaces showed fewer stomata and more trichomes.
机译：杂草控制是作物管理中必不可少的实践。但是，除草剂的使用在某些情况下可能无效，例如在应用技术中遇到问题时以及观察到耐受的个体和耐药的生物型时。在巴西巴伊亚州的棉花产区，燃尽施用过程中没有有效地控制Spermacoce verticillata（枯萎的假纽扣草）。在不同的发育阶段，植物可以改变其叶片的解剖结构，这可能会通过改变化学物质的保留，吸收，易位和最终效果来影响除草剂的控制。这项研究评估了在发育的不同阶段，Spermacoce verticillata叶片的形态和组织学差异。从植物的不同物候阶段收集叶片（2-4片叶子，4-6片叶子和开花），并进行组织学和扫描电子显微镜分析。在组织学分析中，从上节收集了四片叶子。评估的特征为总的叶片厚度，栅栏和海绵状薄壁组织的厚度，表皮和表皮细胞的背面和近轴表面厚度以及中肋的高度和宽度。通过在扫描电子显微镜下观察叶子来进行表面分析。随着黄精子发育阶段的发展，由于背面表皮厚度，运输容器尺寸和实质厚度的减少，植物开始显示出叶片厚度的减少。在发育的更高级阶段（4-6片叶子和开花），叶片的近轴表面显示出更少的气孔和更多的毛状体。

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