概括
墨西哥新发现的一种野生玉米亲属,与Zea perennis不同,表现出独特的根茎和形特征. 它的双体性质 (2n=20) 具有显著的分类学和农业重要性,其种子在当地用于食物.
科学领域:
- 植物学 植物学
- 遗传学 遗传学 是一个
- 民族植物学 民族植物学
背景情况:
- 多年生豆,是玉米 (Zea mays) 的野生亲属,对于理解玉米的进化至关重要.
- 墨西哥的Sierra de Manantlan地区是众所周知的野生玉米亲属生物多样性的热点.
研究的目的:
- 描述一个新发现的来自墨西哥哈利斯科州圣米格尔山 (Cerro de San Miguel) 的多年生神仙种群.
- 调查这个独特的神合成的分类学和潜在的农学意义.
主要方法:
- 长生植物 teosinte 的形态特征,专注于根茎,植物习惯和形结构.
- 确定特定种群的染色体数量 (ploidy水平) 的确定.
主要成果:
- 与Zea perennis相比,teosinte种群表现出双形根茎,强壮的习惯,以及更多的,更长的,松的枝.
- 这种群体是双胞胎的,染色体数为2n = 20.
结论:
- 这种多年生植物代表着一个独特的分类,具有独特的特征.
- 它的双体性质和特定特征为玉米育种和遗传研究提供了宝贵的见解.
- 当地社区利用这种野生玉米的种子作为食物.
相关概念视频
02:16Light Acquisition
In order to produce glucose, plants need to capture sufficient light energy. Many modern plants have evolved leaves specialized for light acquisition. Leaves can be only millimeters in width or tens of meters wide, depending on the environment. Due to competition for sunlight, evolution has driven the evolution of increasingly larger leaves and taller plants, to avoid shading by their neighbors with contaminant elaboration of root architecture and mechanisms to transport water and nutrients.
01:59Plant Breeding and Biotechnology
Crop cultivation has a long history in human civilization, with records showing the cultivation of cereal plants beginning at around 8000 BC. This early plant breeding was developed primarily to provide a steady supply of food.
02:33Seed Structure and Early Development of the Sporophyte
Seed structures are composed of a protective seed coat surrounding a plant embryo, and a food store for the developing embryo. The embryo contains the precursor tissues for leaves, stem, and roots. The endosperm and cotyledons—seed leaves—act as the food reserves for the growing embryo.
01:18Dihybrid Crosses
Overview
01:20Monohybrid Crosses
Overview
01:31Formation of Species
Speciation describes the formation of one or more new species from one or sometimes multiple original species. The resulting species are discrete from the parent species, and barriers to reproduction will typically exist. There are two primary mechanisms, speciation with and without geographic isolation—allopatric and sympatric speciation, respectively.Allopatric SpeciationIn allopatric speciation, gene flow between two populations of the same species is prevented by a geographic barrier, like...